Omron CJ1W-ECT21 Operation Manual page 18

Precautions for Safe Use
Power Supply Design
• Do not exceed the rated supply capacity of the Power Supply Units in the NJ-series Controller. The
rated supply capacities are given in the NJ-series CPU Unit Hardware User's Manual (Cat. No.
W500).
If the capacity is exceeded, operation may stop, malfunctions may occur, or data may not be backed
up normally for power interruptions.
Use NJ-series Power Supply Units for both the NJ-series CPU Rack and Expansion Racks.
Operation is not possible if a CJ-series Power Supply Unit is used with an NJ-series CPU Unit or an
NJ-series Power Supply Unit is used with a CJ-series CPU Unit.
• Surge current occurs when the power supply is turned ON. When selecting fuses or breakers for
external circuits, consider the above precaution and allow sufficient margin in shut-off performance.
Refer to the relevant manuals for surge current specifications. Refer to the NJ-series CPU Unit Hard-
ware User's Manual (Cat. No. W500) for surge current specifications.
• If the full dielectric strength voltage is applied or turned OFF using the switch on the tester, the gener-
ated impulse voltage may damage the Power Supply Unit. Use the adjustment on the tester to grad-
ually increase and decrease the voltage.
• Apply the voltage between the Power Supply Unit's L1 or L2 terminal and the GR terminal when test-
ing insulation and dielectric strength.
• Do not supply AC power from an inverter or other device with a square-wave output. Internal temper-
ature rise may result in smoking or burning. Always input a sinusoidal wave with the frequency that is
given in the NJ-series CPU Unit Hardware User's Manual (Cat. No. W500). Refer to the NJ-series
CPU Unit Hardware User's Manual (Cat. No. W500).
• Apply the voltage between the Power Supply Unit's L1 or L2 terminal and the GR terminal when test-
ing insulation and dielectric strength.
• Install external breakers and take other safety measures against short-circuiting in external wiring.
Turning ON the Power Supply
• It takes up to approximately 10 to 20 s to enter RUN mode after the power is turned ON. During that
time, outputs will be the values specified in the Unit or slave. Use the RUN output on the Power Sup-
ply Unit, for example, to implement fail-safe circuits so that external devices do not operate incor-
rectly.
• Configure the external circuits so that the power supply to the control system turns ON only after the
power supply to the Controller has turned ON. If the power supply to the Controller is turned ON after
the control power supply, temporary errors may result in incorrect control system signals because the
output terminals on Output Units may momentarily turn ON when power supply is turned ON to the
Controller.
• If you transfer data from a backup file on an SD Memory Card to the Controller when the power sup-
ply is turned ON, properly select the data groups to transfer. If the data for an unintended data group
is transferred to the Controller, it may cause the equipment to operate unpredictably.
• Double-check all wiring before turning ON the power supply. Incorrect wiring may result in burning.
Actual Operation
• Check the user program, data, and parameter settings for proper execution before you use them for
actual operation.
• Confirm that the I/O Communication Area Setting Table and I/O Reference Area Setting Table set-
tings are correct. Incorrect system settings can cause unexpected behavior.
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CJ-series EtherCAT Slave Units Operation Manual for NJ-series CPU Unit (W542)