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Troubleshooting using the LED indicators
Troubleshooting UNIT
Power
Unit Power Error
UNIT PWR
Probable cause
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
Probable cause
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.
4-2-2
Unit system errors
72
The UNIT PWR LED Indicator shows whether or not sufficient power is
supplied to the PROFINET IO Communication Unit and the SmartSlice I/O
Units in order for them to start up and operate properly. A UNIT PWR LED
Indicator is provided on the following Units:
•
GRT1-PNT PROFINET IO Communication Unit
•
GRT1-TBL Left Turnback Unit
The table below shows the LED Indicator options.
/i
Note
The PROFINET IO Communication Unit can startup on less power than
specified. 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. An I/O PWR LED Indicator is
provided on the following Units:
•
GRT1-PNT PROFINET IO Communication Unit
•
GRT1-TBL Left Turnback Unit
•
GRT1-PD[] I/O Power Supply Units
The table below shows the LED Indicator options.
/i
If power supply to the Unit and the SmartSlice I/O Units is correct, the Unit will
start initialization at power up. During the initialization process the RUN LED
indicator will remain OFF. Once the initialization has been completed correctly,
the RUN LED indicator will be ON.
Correction
•
Check whether power is supplied to the Unit Power
Connector.
•
Check that the supplied power is within the required range,
i.e.:
+10 % −15 % (20.4 V
24 V
DC
•
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-PNT, the GRT1-TBL or the GRT1-PD2 Unit.
•
Check that the supplied power is within the required range,
i.e.: 24 VDC +10 % −15 % (20.4 V
Section 4-2
to 26.4 V
).
DC
DC
to 26.4 V
).
DC
DC
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Table of Contents
Troubleshooting
