ABB IRB 6400R Product On-Line Manual page 335

2.13 Encoder interface unit, DSQC354
Designation
POWER, 24 VDC
NS/MS
CAN Tx/CAN Rx
ENC 1A/1B
Product Manual
X20
Digin 2
Enc 2B
Enc 2A
Digin 1
Enc 1B
Enc 1A
CAN Rx
CAN Tx
MS
NS
POWER
X5
X3
Colour Description/Remedy
Green Indicates that a supply voltage is
present, and has a level above 12 VDC.
If no light, check that voltage is present on
power unit. That power is present in
connector X20. If not, check cables and
connectors.If power is applied to unit but
unit does not work, replace unit.
Green/red See section 2.14.
Yellow See section 2.14.
Green Indicates phase 1 and 2 from encoder.
Flashes by each Encoder pulse.
By frequencies higher than a few Hz,
flashing can no longer be observed (light
will appear weaker).
If no light, faulty power supply for input
circuit (internal or external). Defective
input circuit on board. External wiring or
connectors, short circuit or broken wire.
Internal error in unit. Constant light indi
cates constant high level on input and vice
versa. No light in one LED indicates fault
in one encoder phase.
Troubleshooting Tools
Status LED's
POWER
NS
MS
CAN Tx
CAN Rx
ENC 1A
ENC 1B
DIGIN 1
25