7.2.1 No LEDs are lit on the controller
Description
No LEDs at all are lit in the controller.
Required test equipment
Equipment needed for troubleshooting:
NoteEquipment
Multimeter
Insulating gloves
Preparations
Action
Make sure that the controller is switched on.1
Wait 30 s - 1 min to enable start-up sequence.
Check the FlexPendant for errors and warnings.2
DANGER
Troubleshooting on the controller while powered on must be performed by personnel
trained by ABB or by ABB field engineers.
Recommended working procedure
If no LEDs are lit on the controller during start-up, use this procedure to troubleshoot
what might cause the problem.
Look at the following block diagram to understand how power is connected from
incoming and forward.
Block diagram
AC input
Power inlet
X0
Main switch
Q
0
Power unit
A1
X
1 X6
L,N,PE
PE
L,N
L,N,PE
L,N
Power
supply
T
2
X1 X2
24V TRUNK
X1
X
2
PC
PS
X
4
X13
HMI
24V SYS DRV
MS
AC
L
ED
LED
LED
Main computer
A
2
24V PC
LED
X1
24V HMI
LED
HMI
c
onnection
X4
FlexPendant
24V HMI
X9
Robot
signal
exchange
proxy
K2
xx2000000443
Continues on next page
358 Product manual - OmniCore C90XT
3HAC073706-001 Revision: D
© Copyright 2020-2021 ABB. All rights reserved.
7 Troubleshooting
7.2.1 No LEDs are lit on the controller
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