Product manual

Troubleshooting Tools
Product Manual 25
2.13 Encoder interface unit, DSQC354
Designation Colour Description/Remedy
POWER, 24 VDC 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.
NS/MS Green/red See section 2.14.
CAN Tx/CAN Rx Yellow See section 2.14.
ENC 1A/1B 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.
POWER
NS
MS
CAN Rx
CAN Tx
Status LED’s
DSQC 354
ABB Flexible Automation
ENC 1A
ENC 1B
DIGIN 1
X20
X5
X3
Encoder
Digin 1
CAN Tx
MS
NS
POWER
CAN Rx
Enc 2A
Enc 2B
Digin 2
Enc 1A
Enc 1B