JPS635979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a control panel for controlling power equipment such as motors.

[Background technology]

As shown in FIG. 1, a conventional control panel houses a control section' in a control panel main body case (not shown).
Attach the operation display unit' to the control panel door (not shown),
Connect the control section' and the operation display section' with two common lines.
It is connected by seven crossover wires consisting of CL' ₁ , CL' ₂ and five dedicated lines EL' ₁ to EL' ₅ .

To explain the operation, in the stopped state,
When operation switch STA' is pressed, power terminal R' - Fuse F' - Common line CL' ₁ - Stop switch STO' - Operation switch STA' - Dedicated line EL' ₂ - Magnetic contactor MC' -
A current flows between the NC side of the switching contact tr' of the thermal relay TR' and the power terminal S', and the magnetic contactor MC' is energized, its normally open contact mc' ₁ is closed, and the power terminal
R' - Fuse F' - Common line CL' ₁ - Stop switch
STO' - Dedicated line EL' ₁ - Normally open contact mc' ₁ - Magnetic contactor
Current flows between MC′, NC side of switching contact tr′ of thermal relay TR′, and power supply terminal S′, and the magnetic contactor
MC′ becomes self-holding state and the operation switch is turned on.
Even if STA' is returned to its original state, the state will be maintained.
At this time, at the same time, the normally open contact mc′ ₂ of the magnetic contactor MC′
is closed and power terminal R′ - Fuse F′ - Normally open contact
mc' ₂ - Dedicated line EL' ₄ - Operation indicator RL' - Common line
Current flows between CL' ₂ and power terminal S', operation indicator lamp RL' lights up, normally closed contact mc' ₃ opens, and power terminal R' - fuse F' - normally closed contact mc' ₃ - Dedicated line
EL' ₃ - Stop indicator lamp GL' - Common line CL' ₂ - Power terminal S' is opened, stop indicator lamp GL' goes out, normally open contacts mc' ₄ to mc' ₆ are closed, and thermal relay Power is supplied to the load LD' via TR'.

When the stop switch STO' is pressed during operation, the power terminal R' - fuse F' - stop switch is
STO' - Normally open contact mc' ₁ - Magnetic contactor MC' - NC side of switching contact tr' of thermal relay TR' - Power supply terminal
S' is opened, the self-holding normally open contact mc' ₁ is opened, the normally open contact mc' ₂ is opened, the operation indicator lamp RL' goes out, and the normally open contact mc' _{3 is} opened. is closed, the stop indicator lamp GL′ lights up, and the normally open contact mc′ ₄
~ _mc'6 is opened and power supply to load LD' is stopped.

During operation, an overcurrent flows through the load LD', causing the thermal relay TR' to trip, and its switching contact to
When tr' switches to the NO side, the excitation of the magnetic contactor MC' stops in the same way as when the stop switch STO' is pressed, and the operation indicator lamp RL' goes out and the stop indicator lamp GL' lights up. At the same time, alarm relay ALX′ is energized and its normally open contact alx′ is closed.
Current flows between power terminal R' - Fuse F' - Dedicated line EL' ₅ - Fault indicator lamp OL' - Common line CL' ₂ - Power terminal S' and the fault indicator lamp OL' lights up.

However, such a conventional control panel requires as many as seven crossover wires to connect the control section housed in the control panel body case and the operation display section attached to the control panel door, and the wiring of the crossover wires is difficult. It was not easy to work with, and it also had the disadvantage of making it difficult to open and close the control panel door.

[Purpose of the invention]

This invention can reduce the number of crossover wires between the control section and the operation display section, and can also transmit run and stop signals from the control section to the operation display section, as well as transmit run, stop and failure display signals from the control section to the operation display section. The objective is to provide a control panel that can transmit information to the department.

[Disclosure of the invention]

In the control panel of the present invention, first and second control-side common line connection terminals are connected to one and the other power supply terminals, respectively, and an operation relay is connected between the control-side dedicated line connection terminal and the other power supply terminal. The normally open contact of the electromagnetic contactor for load control and the output normally open contact of the periodic disconnection means are connected, a resistor is inserted and connected in series with the operation relay, and a capacitor is connected in parallel with the operation relay. A group of control side diodes is inserted so as to regulate the energization direction of the relay in one direction and to regulate the energization direction of the normally open contact of the load control electromagnetic contactor and the output normally open contact of the periodic disconnection means in the other direction. energization to the load control electromagnetic contactor is controlled by the normally open contact of the operation relay, and when a load failure occurs, the failure detection means forcibly cuts off the energization to the load control electromagnetic contactor, and the periodic A control unit configured to operate the disconnection means, and a first and second operation display side common line connection terminal connected to the first and second control side common connection terminal via first and second common lines. At the same time, an operation display side dedicated line connection terminal is connected to the control side dedicated line connection terminal via a dedicated line, and the first operation display side common line connection terminal and the operation display side dedicated line connection terminal are connected to each other. Connect a normally open operating switch, a signal receiving relay, and the normally open contact of this signal receiving relay between them, and install a normally closed stop switch in a position that can at least prevent energization to the normally open contact of this signal receiving relay. The direction of conduction of the normally open contacts of the operating switch and the signal receiving relay is regulated in the same direction as the direction of conduction of the operating relay, and the direction of conduction of the signal receiving relay is regulated to be the same as the direction of conduction of the normally open contacts of the load control electromagnetic contactor. A group of diodes on the operation display side is inserted and connected so as to regulate the energization direction to be the same as that of the open contact and the output normally open contact of the periodic disconnection means, and the common line connection terminal on the first and second operation display sides is connected. and an operation display section provided with a display that is supplied with power and responds to the signal reception relay.

With this configuration, only two common lines and one dedicated line are used as crossover lines,
Run and stop operation signals can be transmitted from the operation display section to the control section, and run, stop and failure display signals can also be transmitted from the control section to the operation display section.

A first embodiment of this invention will be described based on FIG. In this control panel, the control section is housed in a control panel body case (not shown), the operation display section is attached to the control panel door (not shown), and the control section 1 and the operation display section are connected through two common lines. CL ₁ , CL ₂ and one dedicated line
It is connected by three crossover wires consisting of EL ₁ . _T1 ,
T ₂ is the control side common line connection terminal, T ₃ is the control side dedicated line connection terminal, T ₄ and T ₅ are the operation display side common line connection terminal,
_T6 is the dedicated line connection terminal on the operation display side.

To explain the operation, in the stopped state,
When operation switch STA is pressed, power terminal r → common line CL ₁ → stop switch STO → operation switch STA
→Diode D ₄ →Dedicated line EL ₁ →Alarm relay
NC side of switching contact alx ₁ of ALX → Diode D ₁ → Resistor R ₁ → Operating _relay Power terminal R - Fuse F - Normally open contact x ₁ - Magnetic contactor MC - Thermal relay TR
Current flows between the NC side of the switching contact tr and the power supply terminal S, energizing the magnetic contactor MC, and normally open contact MC ₁
is closed and the other side is half-wave energized in the path of power terminal s → normally open contact mc ₁ → diode D ₂ → dedicated line EL ₁ → diode D ₅ → signal receiving relay Z → common line CL ₁ → power terminal r. , the signal receiving relay Z is energized and its normally open contact z ₁ is closed, and the power terminal r → common line CL ₁ →
Stop switch STO → normally open contact z ₁ → diode D ₄
→Dedicated line EL ₁ →Alarm relay ALX switching contact alx ₁
A half-wave current flows on one side in the path from NC side → resistor R ₁ → operating relay X → power terminal s, resulting in a self-holding state. At the same time, the normally open contact of signal reception relay Z
By closing z ₂ , the power terminal r - common line CL ₁
- Normally open contact z ₂ - Operation indicator RL - Common line CL ₂
- Current flows between power terminals s and operation indicator lamp
RL lights up and the normally closed contact z ₃ of the signal reception relay Z opens, causing the connection between power terminal r - common line CL ₁ - normally closed contact z ₃ - stop indicator GL - common line CL ₂ - power terminal s. The circuit is opened and the stop indicator lamp GL goes out. Moreover, the normally open contacts _mc2 to _mc4 are closed by the excitation of the electromagnetic contactor MC, and power is supplied to the load LD via the thermal relay TR.

When the stop switch STO is pressed in the operating state, power terminal r → common line CL ₁ → stop switch STO
→ Normally open contact z ₁ → Diode D ₄ → Dedicated line EL ₁ → NC side of switching contact alx ₁ → Diode D ₁ → Resistor R ₁ → Operation relay stops, normally open contact x ₁ opens, excitation of magnetic contactor MC stops, and normally open contact mc ₂ ~
mc ₄ is opened and the power supply to the load LD is stopped, normally open contact mc ₁ is opened and power supply terminal r → normally open contact mc ₁ →
Diode D ₂ → Dedicated line EL ₁ → Diode D ₅ → Signal receiving relay Z → Common line CL ₁ → The path of power terminal r is opened, the excitation of signal receiving relay Z is stopped, and normally open contact z ₁ is opened. self-hold is released. At the same time, the normally open contact _z2 opens and the operation indicator lamp lights up.
RL goes out, normally closed contact _z3 closes, and the stop indicator GL lights up.

During operation, an overcurrent flows through the load LD, causing the thermal relay TR to trip, causing its switching contact to
When tr switches to the NO side, the excitation of the magnetic contactor MC stops, normally open contacts MC ₂ to _{MC 4} open, and the load LD
The power supply to is stopped and the normally open contact mc ₁ is opened. On the other hand, the alarm relay is activated by switching the switching contact tr to the NO side.
ALX is energized, its normally open contact alx ₂ closes, the flicker relay FCR starts operating, its normally open contact fcr is intermittently closed, and the switching contact alx ₁ of alarm relay ALX changes to the NO side. Switch to power terminal s →
Normally open contact fcr → diode D ₃ → NO of switching contact alx ₁
side → Dedicated line EL ₁ → Diode D ₅ → Signal receiving relay Z → Common line CL ₁ → Current flows intermittently in the path of power terminal r, so signal receiving relay Z is intermittently excited and normally open. Since contact z ₂ is intermittently opened and normally closed contact z ₃ is intermittently closed, the operation indicator RL flashes and the stop indicator lamp blinks.
GL flashes in reverse to indicate a malfunction.

In addition, in the figure, capacitor C ₁ , which is connected in parallel to operation relay X and signal reception relay Z,
_C2 is intended to prevent chattering of the contacts that occurs when each relay X, Z is operated in a half-wave, and is designed to smooth the voltage applied to the coil. In addition, the resistor R ₁ inserted and connected in series with the operation relay X constitutes a time constant circuit with the capacitor C ₁ , and by delaying the operation of the operation relay
is activated, the thermal relay
This is to ensure stable operation of operation relay X and signal reception relay Z to the safe side (non-excited side) when TR is reset. That is, if resistance
Without R ₁ , the normally open contact of the flickering relay FCR
When thermal relay TR is reset and switching contact tr is switched to the NC side while fcr is closed, excitation of alarm relay ALX is stopped and switching contact ALX ₁ is turned off.
is switched to the NC side, but at this time the power terminal r→
Common line CL ₁ → Stop switch STO → Normally open contact z ₁ → Diode D ₄ → Dedicated line EL ₁ → NC side of switching contact alx ₁ → Diode D ₁ → Operation relay X → Current flows immediately in the path of power supply terminal s The operation _relay . Resistor R ₁ eliminates this problem,
Delay operation of operating relay X until normally open contact _z1 opens.

Further, the stop switch STO may be inserted at the position _P1 or _P2 in the figure instead of the illustrated position. Further, a series circuit of normally open contact alx ₂ and flicker relay FCR may be connected between power terminals r and s.
Moreover, a photocoupler may be used for the signal receiving relay Z etc. instead of a contact type one.

As a result of this configuration, the control unit and the operation display unit are connected via two common lines CL ₁ and CL ₂ and one dedicated line.
Just connect using the 3 wires of EL ₁ ,
A running operation signal and a stop operation signal can be sent from the operation display section to the control section, and an operation display signal, a stop display signal, and a failure display signal can also be sent from the control section to the operation display section. Note that when the number of control systems in the control panel is N, the number of crossover wires is N+2. In addition, the parts used to reduce the number of crossover wires are an operation relay X, a signal reception relay Z, diodes D ₁ to D ₅ , and a capacitor.
Only C ₁ , C ₂ and resistor R ₁ are required, and the circuit configuration is simple, highly reliable, and low cost, and general relays can be used for the two relays X and Z mentioned above. Furthermore, there is no need for special handling of each display and operation, including the failure display, and there is no difference from a general wiring system, so maintenance is easy. Furthermore, since the operation display section is under low pressure, it is safe. In addition, like conventional self-holding circuits, self-holding is released in the event of a power outage, and the load LD does not suddenly start operating when the power is restored, making it safe.

A second embodiment of the invention will be described based on FIG. This control panel connects _{the normally open contact fcr of the flicker relay FCR in parallel to the normally open contact mc 1 of the magnetic contactor MC, and connects the diode D 1 , operation relay} This embodiment differs from the first embodiment in that the series circuit of the normally closed contacts fcr' of the FCR is connected in parallel and the switching contact _alx1 is removed.

Regarding the operation, the normal running operation and stopping operation are the same as in the first embodiment. Furthermore, when the thermal relay TR is tripped, the operation of the signal reception relay Z is interrupted in the same way as in the first embodiment by opening and closing the normally open contact fcr. The energizing path is opened and closed, and when the signal receiving relay Z is operating, the operation relay X is prohibited from being energized.

〔Effect of the invention〕

The control panel of the present invention can reduce the number of crossover wires between the control unit and the operation display unit, can control operation and stop, and display operation, stop, and failure, and can Even in such a situation, there is an effect that it can be stabilized on the safe side when the failure detection means is restored.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional control panel, FIG. 2 is a circuit diagram of a first embodiment of the present invention, and FIG. 3 is a circuit diagram of a main part of a second embodiment of the present invention. ...control section, ...operation display section, X ...operation relay, x ₁ ...normally open contact, MC ...magnetic contactor,
mc ₁ ...Normally open contact, TR...Thermal relay, tr
...Switching contact, ALX...Alarm relay, FCR...
…flicker relay, fcr…normally open contact, Z…signal receiving relay, z ₁ …normally open contact, STA…operation switch, STO…stop switch, CL ₁ , CL ₂ …
... Common line, EL ₁ ... Dedicated line, RL ... Operation indicator lamp, GL ... Stop indicator lamp, OL ... Failure indicator lamp, D ₁ to D ₁₀ ... Diode, R ₁ ... Resistor,
C ₂ ... Capacitor.

Claims (1)

[Claims] 1. In response to turning on the operation switch of the operation display section, one half-wave current is applied to the operation relay through the dedicated crossover wire and through the delay means of the control section, and the load control electromagnetic circuit of the control section that responds to the operation relay In response to the normally open contact of the contactor being turned on, a half-wave current is applied to the other side of the receiving relay of the operation display unit, which has a normally open contact connected in parallel to the operation switch, through the dedicated crossover wire, and the operation display unit is stopped. The control unit responds to the operation of the failure detection means of the control unit, which blocks at least one side half-wave energization in response to the switch being turned off, and cuts off the energization to the load control electromagnetic contactor in the event of a load abnormality. activating the periodic disconnection means of the periodic disconnection means, and energizing the reception relay intermittently through the dedicated crossover wire by the periodic on/off operation of the output contact of the periodic disconnection means, and causing the reception relay to respond with an indicator of the operation display section. A control panel designed to allow