Power Supply Errors - Omron GRT1 - 27-11-2006 Operation Manual

Troubleshooting using the LED Indicators
4-2-1

Power Supply Errors

Troubleshooting UNIT
Power
Unit Power Error
UNIT
PWR
Not lit No Power or not enough power is being supplied to
the Units (See note)
Flashing The Unit power supply capacity is insufficient.
Lit No Unit power error. The correct power is supplied to the System.
Troubleshooting I/O
Power
I/O Power Error
I/O PWR
Not lit No Power or not enough power is being supplied to
the External I/O of the SmartSlice I/O Units
Lit No I/O power error. The correct power is supplied to the External I/O System.
Errors in the Power supply of the Unit or the external I/O are indicated by the
UNIT PWR and I/O PWR LED Indicators.
The UNIT PWR LED Indicator shows whether or not sufficient power is sup-
plied to the PROFIBUS Communication Unit and the SmartSlice I/O Units in
order for them to startup and operate properly. A UNIT PWR LED Indicator is
provided on the following Units:
• GRT1-PRT PROFIBUS Communication Unit
• GRT1-TBL Left Turnback Unit
The table below shows the LED Indicator options.
Probable cause
Note The PROFIBUS Communication Unit can startup on less power than speci-
fied. If this happens, the UNIT PWR LED Indicator may be OFF, whereas
other LED Indicators may indicate correct operation. In this situation however,
correct operation of the whole SmartSlice I/O System is not guaranteed.
The I/O PWR LED Indicator shows whether or not sufficient power is supplied
to the External I/O Power lines to the SmartSlice I/O Units in order for them to
drive the external Outputs on the individual Units.I/O slices. A I/O PWR LED
Indicator is provided on the following Units:
• GRT1-PRT PROFIBUS Communication Unit
• GRT1-TBL Left Turnback Unit
• GRT1-PD2 I/O Power Supply Unit
The table below shows the LED Indicator options.
Probable cause
Correction
• Check whether power is supplied to the Unit Power
Connector.
• Check that the supplied power is with in the
required range, i.e. 24 Vdc +10% -15% (20.4 to
26.4 Vdc).
• Check the entire SmartSlice I/O System's power
supply requirement and replace the power supply
with one that has sufficient capacity.
Correction
• Check whether power is supplied to the I/O Power
Connector on the GRT1-PRT, the GRT1-TBL or the
GRT1-PD2 Unit.
• Check that the supplied power is with in the
required range, i.e. 24 Vdc +10% -15% (20.4 to
26.4 Vdc).
Section 4-2
61