E L C O p e r a t i o n M a n u a l
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MN05003006E
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1.2.6
Pre-power up checks and Troubleshooting
1.2.6.1 Pre-power up checks
ELC-PB/PC/PA/PH/PV
Before Turning ON the Power
After wiring, be sure to check the items below before turning ON the power supply to the ELC.
1. Installation
Does the unit type match the device list during the design stage?
Are all of the units firmly attached?
2. Power supply
Is operating voltage supplied correctly?
Is the power supply cable properly connected?
Are both voltage and polarity connected correctly for each connection
Protection against excess current: when overloaded, the output voltage dips.
Although the output voltage will return to normal when the load returns to normal, be
careful as long overloads or short-circuits will cause deterioration or destruction of
internal circuits.
Attaching additional power supply units in parallel is not allowed! It may destroy
internal circuits and the power supplies.
3. Check Input/Output terminals
Does the wiring on the connector and terminal match?
Is the operating voltage for the I/O devices correct?
Are the I/O connectors properly connected?
Is the wire size correct?
Note: These precautions concern the ELC-PS01/PS02 power supply units.
Turning the Power ON
After checking the items above, perform the trial operation by using to the following procedure.
1. Check the “POWER” LED on the front of the ELC extension units and the controller.
2. Check the “LV” LED on the front of the ELC extension units.
Check Communications with ELC controller
1. After Power up and the ELC completes its initial setup. The total number of extensive
input/output points will be stored in special data registers of D1142 and D1143.
2. Please check D1142 and D1143 to confirm the number of discrete I/O points is accurate..
Power Indication
The “POWER” LED on the front of the ELC will be lit (green) if the power is on.
