JPS635976B2 - - 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]

Conventional control panels have been equipped with a special check circuit to detect failures such as interruption of the control power supply and disconnection of dedicated crossover wires, and these have been detected by performing special operations.

However, adding a check circuit like this has the problem of increasing costs, and only specific failures can be detected.

[Purpose of the invention]

An object of the present invention is to provide a control panel that has a simple and inexpensive configuration and can detect various types of failures without special operations.

[Disclosure of the invention]

The control panel of the present invention applies half-wave current to one side of the operation relay of the control panel through a dedicated crossover wire in response to the turning on of the operation switch of the operation section, and the normal state of the electromagnetic contactor for load control that responds to the operation relay. In response to the open contact being turned on, the receiving relay having a normally open contact connected in parallel to the operating switch is energized for a half wave on the other side through the dedicated crossover wire, and in response to the turning off of the stop switch, at least one side is energized for a half wave. The control panel is characterized in that a light emitting element is inserted and connected in the dual-wave conduction path.

With this configuration, various failures can be detected simply by keeping the operation switch on for a certain period of time. That is, when the light emitting element does not light up, it can be determined that there is an abnormality in the power supply circuit, a disconnection of the power supply line, or a disconnection of the dedicated crossover wire. Further, when the light emitting element lights up dimly and does not become bright, it can be determined that the circuit of the electromagnetic contactor for load control is defective and the dedicated crossover wire is normal. Furthermore, when the light-emitting element lights up brightly, it can be determined that all parts are normal, and the bright lighting of the light-emitting element also serves as an operation indication, and when the light-emitting element goes out when the operation switch is turned off, it serves as a stop indication.

Examples of the present invention will be described below.

A first embodiment of this invention will be described based on FIG. This control panel has a control section housed in a control panel body case (not shown), an operation display section attached to a control panel door (not shown), and 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 →Diode D ₈ →Light-emitting diode LED ₁ →Diode D ₇ →Dedicated line EL ₁ →NC side of switching contact alx ₁ of alarm relay ALX →Diode D ₁
→ _Resistor R ₁ → Operating _relay A current flows between power terminal R - fuse F - normally open contact x ₁ - magnetic contactor MC - NC side of switching contact tr of thermal relay TR - power terminal S, and the magnetic contactor MC is energized, making the normally open contact When mc ₁ is closed, power supply terminal s → normally open contact mc ₁ → diode D ₂
→Diode D ₆ →Light-emitting diode LED ₁ →Diode D ₉ →Dedicated line EL ₁ →Diode D ₅ →Signal reception relay Z →Common line CL ₁ →The other side is half-wave energized through the path of power terminal r, and the light-emitting diode LED ₁ lights up brightly,
And signal receiving relay Z is energized and its normally open contact
z ₁ is closed, power terminal r → common line CL ₁ → stop switch STO → normally open contact z ₁ → diode D ₄ → diode D ₈ → light emitting diode LED ₁ → diode D ₇ →
Dedicated line EL ₁ → Alarm relay ALX switching contact ALX ₁
A half-wave current flows on one side in the path of 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 z ₂ of the signal receiving relay Z is closed, thereby connecting the power terminal r - the common line CL ₁ - the normally open contact z ₂ - the operation indicator lamp RL - the common line CL ₂ - the power terminal s. Current flows, the operation indicator lamp RL lights up, and the normally closed contact z ₃ of the signal receiving relay Z opens, so that the power terminal r - common line CL ₁ - normally closed contact
r ₃ - Stop indicator lamp 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 through the thermal relay TR.

When the stop switch STO is pressed during operation, power terminal r → common line CL ₁ → stop switch STO
→Normally open contact z ₁ →Diode D ₄ →Diode D ₈ →
Light emitting diode LED ₁ → Diode D ₇ → Dedicated line
EL ₁ → NC side of switching contact alx ₁ → Diode D ₁ → Resistor R ₁ → Operating _relay
is opened and the excitation of the magnetic contactor MC is stopped, the normally open contacts _mc2 to _mc4 are opened and the power supply to the load LD is stopped, and the normally open contact _mc1 is opened and the power terminal r→normally open. Contact mc ₁ → Diode D ₂ → Dedicated line EL ₁ → Diode
D ₆ → Light emitting diode LED ₁ → Diode D ₉ → 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 the normally open contact z ₁ is developed and self-retention is released. At the same time, the normally open contact _z2 is opened and the operation indicator lamp RL is turned off, and the normally closed contact _z3 is closed and the stop indicator lamp GL is lit.

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 ₆ → Light emitting diode
LED ₁ → Diode D ₉ → 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 lamp RL blinks and the stop indicator lamp GL blinks in reverse to indicate a malfunction.

Also, by keeping the operating switch STA closed for a certain period of time, various types of failures can be checked. That is, when the light emitting diode LED ₁ does not light up, it can be determined that there is an abnormality in the power supply circuit, a disconnection in the power supply line, or a disconnection in the dedicated line EL ₁ . In addition, if the light emitting diode LED ₁ lights up dimly and does not become bright, it is due to a malfunction in the circuit of the magnetic contactor MC.
EL ₁ can be determined to be normal. In addition, when light emitting diode LED ₁ lights up brightly, it can be determined that all parts are normal, and light emitting diode LED ₁
The bright lighting also serves as an operation indicator, and the operation switch is turned on.
Light emitting diode with STA turned off
When LED ₁ goes out, it becomes a stop indication and the light emitting diode
Blinking LED ₁ indicates a failure.

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 → Diode D ₈ → Light emitting diode
LED ₁ → Diode D ₇ → Dedicated line EL ₁ → Switching contact
A current immediately flows through the path of NC side _of alx ₁ → diode D ₁ → operating relay X → power supply terminal s, energizing operating relay While power is supplied to the load LD, the signal receiving relay Z is excited and this state is maintained. Resistor R ₁ eliminates this problem and delays operation of operating relay X until normally open contact z ₁ 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. Furthermore, since the light emitting diode LED ₁ also serves as a running, stopping, and failure indication, the operation indicator lamp RL, stop indicator lamp GL, etc. can be omitted.

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 be sent from the control section to the operation display section and displayed. 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 include two diodes D ₁ to 1 for the operation relay X and the signal reception relay Z.
Only _D5 , capacitors _C1 , _C2 , and resistor _R1 are required, making the circuit configuration simple, highly reliable, and low cost.
General relays can also be used for the two relays X and Z mentioned above. Furthermore, there is no need for any special handling of each display or 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.

In addition, it is a simple and inexpensive configuration that simply inserts and connects the light emitting diode LED ₁ through the diodes D ₆ to D ₉ into the line directly connected to the dedicated line EL ₁ , and the light emitting diode LED can be connected by simply pressing and holding the operation switch STA. Simply check the lighting status of ₁ to connect the dedicated line.
It can detect failures such as EL ₁ disconnection, electromagnetic contactor MC circuit failure, and power line disconnection.

A second embodiment of the invention will be described with reference to FIG. This control panel uses the light emitting diode shown in Figure 1.
In place of LED ₁ and diodes D ₆ to _{D 9} , two light emitting diodes LED ₂ and LED ₃ connected in antiparallel are used, and the other features are the same as those in FIG. 1.

In this embodiment, the light emitting diode LED ₂ lights up by applying half-wave current to _the operation relay By energizing the side half-wave, the other light emitting diode LED ₃ lights up, and the light emitting diode
By simply checking the light emitting states of LED ₂ and LED ₃ , various failures can be detected in the same manner as in the first embodiment.

Note that one non-polar lamp may be inserted in place of the light emitting diode LED ₁ and the diodes D ₆ to _{D 9} in FIG. 1.

〔Effect of the invention〕

The control panel of the present invention has a simple and inexpensive configuration that requires only inserting and connecting the light emitting elements to predetermined locations, and allows the user to check the light emitting state of the light emitting elements with the simple operation of keeping the operation switch on. Can detect various types of failures.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a first embodiment of the invention, and FIG. 2 is a circuit diagram of a main part of a second embodiment of the invention. …control unit _, …operation _display unit,
ALX...Alarm relay, FCR...Flicker relay, fcr
…Normally open contact, Z…Signal receiving relay, z ₁ …Normally open contact, STA…Run switch, STO…Stop switch,
CL ₁ , CL ₂ ...Common line, EL ₁ ...Dedicated line, RL...Operation indicator lamp, GL...Stop indicator lamp, _D1 to _D9 ...Diode, LED ₁ to _{LED 3} ...Light emitting diode.

Claims (1)

[Claims] 1. In response to turning on the operation switch of the operation section, one side half-wave current is applied to the operation relay of the control section through a dedicated crossover wire, and the normally open contact of the electromagnetic contactor for load control of the control section responds to the operation relay. In response to the turning on of the stop switch of the operating section, a half-wave current is applied to the other side of the receiving relay of the operating section which has a normally open contact connected in parallel to the operation switch through the dedicated crossover wire, and in response to the turning off of the stop switch of the operating section, at least 1. A control panel configured to prevent half-wave energization on one side, characterized in that a light emitting element is inserted and connected in a double-wave energization path.