Electrical Installation; Contents Of This Chapter; Wiring - ABB Q952 User Manual

Electrical installation

Contents of this chapter

This chapter describes the wiring of the safety option done at the factory and contains
guidelines for making user connections (if any).

Wiring

One emergency stop button and one reset button are installed on the cabinet door and
wired to the drive at the factory. There are double contacts in the emergency stop button
and double wiring (redundant two-channel connection) between the button and the
emergency stop safety relay [A61]. The safety relay detects cross faults and faults across
one contact from the emergency stop button.
If needed, install additional emergency stop buttons on site and wire them to the appropriate
terminal block inside the drive cabinet. See the circuit diagrams delivered with the drive.
Obey these general rules:
1. Use only double-contact buttons approved for the emergency stop circuits.
2. Connect the emergency stop buttons with two conductors (two-channel connection).
Note: Keep the channels separate. If you use only one channel, or if the first and second
channels are connected together (for example, in a chain), the cross-fault detection of
the emergency stop safety relay trips and activates the emergency stop command of
the drive as it detects a redundancy fault.
3. Use shielded, twisted pair cables. We recommend a double-shielded cable and
gold-plated contacts in the emergency stop button.
4. Ensure that the sum resistance for one channel (loop resistance) does not exceed 1
kohm.
5. Obey the general control cable installation instructions given in the drive hardware
manual.
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