G9SE Fault Detection
Written by Brett Hook
Updated at May 20th, 2022
Scenario
The power indicator light on your G9SE unit is blinking, or other indicator lights are blinking when the power indicator light is on.
Additionally, the G9SE is not outputting an 'ON' signal.
Issue
A fault has occurred with either the G9SE or the configuration in which it is installed.
Solution
To appropriately resolve this issue, the indicator lights must first be interpreted to determine the cause.
The indicator lights on a G9SE unit are the same for the G9SE-201 and the G9SE-401, and appear as shown in the below image.
The indicator lights on a G9SE-221-T05 and G9SE-221-T30 are slightly different from the other models, and appear as shown in the below image.
Please follow the below questions to determine the cause of the issue, and checks to make to resolve the issue.
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Lit up / On
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Not lit / Off
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Blinking
- Add Button
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One or both are blinking
- Add Button
Remove power from the G9SE unit, then check the wiring from the safety input devices to the G9SE unit.
Alternatively, check the inputs sequence of the safety input devices.
Check the power input to the unit.
Note that combinations of the below conditions are possible, therefore care should be taken when analysing the potential faults.
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The IN1 indicator light is blinking
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The IN2 indicator light is blinking
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The IN1 and IN2 indicator lights are lit / On
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The IN1 and IN2 indicator lights are not lit / Off
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The OUT indicator light is blinking
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The OUT1 and OUT2 indicator lights are blinking
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The OUT2 indicator light is blinking
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All of the other indicator lights are blinking
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All of the other indicator lights are not lit / Off
- Add Button
1) Failures involving the wiring of safety input 1.
Resolve this issue by removing power from the G9SE unit, then check the wiring to terminals T11 and T12.
2) Failures of the parts of the circuits of safety input 1.
This fault requires replacement of the G9SE unit with a new unit.
1) Failures involving the wiring of safety input 2.
Resolve this issue by removing power from the G9SE unit, then check the wiring to terminals T21 and T22.
2) Failures of the parts of the circuits of safety input 2.
This fault requires replacement of the G9SE unit with a new unit.
1) Failures involving the wiring of the Feedback/Reset input.
Resolve this issue by removing power from the G9SE unit, then check the wiring to terminals T31, T32 and T33.
2) Failures of the parts of the circuits of the Feedback/Reset input.
This fault requires replacement of the G9SE unit with a new unit.
1) Failures involving the wiring of the Feedback/Reset input.
Resolve this issue by removing power from the G9SE unit, then check the wiring to terminals T31, T32 and T33.
2) Failures of the parts of the circuits of the Feedback/Reset input.
This fault requires replacement of the G9SE unit with a new unit.
This issue requires replacement of the G9SE unit with a new unit.
This indicator light pattern can only occur on the G9SE-221-T05 and G9SE-221-T30 models.
This issue requires replacement of the G9SE unit with a new unit.
There is a mismatch of the two Off-Delay Time Preset Switches.
Remove power from the G9SE unit, and check both of the two Off-Delay Time Preset Switches. Both switches must be set to the same value.
Note that one switch is located on the front of the G9SE unit, near the indicator lights, while the other switch is located on the rear of the G9SE unit.
Remove power from the G9SE unit, and check the supply voltage. The rated supply voltage for the G9SE is 24 VDC, with a variance of -15% to +10%.
Note that while this translates to a voltage range of 20.4 VDC to 26.4 VDC, it is possible for the supply voltage to fluctuate due to external factors, so it is desirable for the value of the supply voltage to be as close to 24 VDC as possible.
1) Excessive electro-magnetic disturbance.
Resolve this issue by removing power to the G9SE unit, then check the level of electro-magnetic disturbance around the G9SE and the associated system connected to the unit.
2) Failures of parts of the internal circuits.
This issue requires replacement of the G9SE unit with a new unit.
Another method of determining the fault is to consult the below tables.
If your G9SE unit is showing indicator light patterns that are not covered by this guide, please consult your local OMRON support for further assistance.