PLC is a control device which also requires the control system of support as other control devices, and to enable the employment of this device is required external voltage source arranged in a control system which aims to regulate and protect the system. There are three supporting control systems to be installed on the PLC control system:
1. control circuits that supply power to the PLC and the voltage source to source for additional backup system.
2. control circuit which supplies the input voltage source to the input of the PLC and
3. control circuit supply voltage output source to outputan PLC.
And third above the control circuit functions to:
a. protect the system from overload currents and current land
b. provide electricity services to the PLC, including all device input / output,
c. his isolated state error / alarm that occurred at PLC
d. voltage source to provide a computer / notebook used for the purposes of maintenance, monitoring and trouble shooting.
e. Protect your PLC system from interference and voltage ripples freukwensi unwanted.
Power circuit
There are several major components in power circuits, namely:
1. System voltage source
The source is the same as an existing voltage source on induction in general, ie 380 V and 220 V for voltage standards in Indonesia.
2. Transformer
This device is useful to decrease or increase the voltage in order to obtain the voltage output (secondary) in accordance with working voltage between the PLC system if the existing working voltage 100V (Japan standard devices) it is necessary to step-down transformer input 380 V and 100 V.
3. Power Supply
This device is useful to rectify AC voltage into DC voltage source voltage required to work on a particular type of PLC.
4. Breaker
Breaker allows you to decide-connect circuits from voltage source, this term could occur at the condition of overload, short circuit and for maintenance, teganganpun rating should be selected in accordance with the load capacity it serves, in this case have calculated the amount of power at the transformer serving the device- devices such as power supply, PLC, Relay and others.
5. Earth Leakage Breaker (ELB)
Kegunannya almost the same as ordinary breaker is disconnected from the circuit-connecting the voltage source, only ELB has a special function system that is isolated from circuit ground disturbance connect tanah.gangguan meant here is the existence of leakage current from the system ground / Ground that can cause voltage potential touch is dangerous to the safety of humans. ELB will decide if the system detected some miliampere leakage current rating of just depending on the ELB.
6. Circuit Protector
As the function of breaker, circuit protector serves to protect circuits from overcurrent interruption and short circuit, and it can be said that the circuit breaker with a rating of protector is a small stream to protect the control circuits.
7. Noise Filter
This device is useful for menfilter the voltage ripples freukuensi entering the system so that the output voltage and freukuensi always produce that does not interfere with PLC control system, the Device is a parallel series connection of inductor and capacitor that is able to reduce freukuensi-freukuensi particularly wild.
8. Relay
As we know that the relay will always be in control system how to type and form of system used, the benefits in the off-set the conditions on the device causing a series of relays used in power systems for the control system.
9. Maintenance Source
These devices are similar to regular socket that provides the source voltage for the computer / notebook for the purposes of maintenance, monitoring and troubleshooting PLC control system.
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