5 Electrical connections
5.7.6 Encoder interface unit, DSQC 354 (optional)
3HAC 16245-1 A 127
The figure below show the layout of the pins in connector X20:
xx0100000235
Bus status LEDs The figure and table below show the location and significance of the the LEDs on the board.
Not used 13
Not used 14
Not used 15
Not used 16
Signal name X20 pin Explanation
1
16
Designation Color Description
POWER, 24 VDC Green Indicates that a supply voltage is present, and has a level
above 12 VDC.
If there is no light, check that voltage is present on power unit
and in connector X20. If not, check cables and connectors.
If power is applied to the unit but it does not work, replace the
unit.
NS/MS Green/red See section "CAN bus status LED description".
CAN Tx/CAN Rx Green/red See section "CAN bus status LED description".
ENC 1A/1B Green Indicates phase 1 and 2 from encoder. Flashes at each
Encoder pulse. At frequencies higher than a few Hz, flashing
can no longer be observed (light will appear weaker).
If there is no light, there is an error due to one or more of the
following reasons:
• Faulty power supply for input circuit (internal or
external).
• Defective input circuit on board.
• Short circuit or broken wire in external wiring or con-
nectors.
• Internal error in unit.
Constant light indicates constant high level on input and vice
versa.
No light on one LED indicates fault in one encoder phase.
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