Electrical Installation; Contents Of This Chapter; Wiring - ABB Q957 User Manual

For acs880-07/07lc/17/17lc/37/37lc drives, prevention of unexpected start-up

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Electrical installation

This chapter describes the wiring of the safety option done at the factory and contains

guidelines for making user connections.

The operating switch and the indication lamp for the POUS function are not factory-installed.

The user must install and connect them to the drive on site.

There are double contacts in the POUS switch [S] and double wiring (redundant two-channel

connection) between the button and the POUS safety relay [A65]. The safety relay detects

cross faults and faults across one contact from the POUS switch.

Connect the POUS switch to the applicable terminals inside the drive cabinet. For the POUS

indication lamp [P], ABB recommends an LED indication lamp. Refer to the circuit diagrams

delivered with the drive. Obey the rules below:

1. Use only double-contact switches. ABB recommends approved and lockable switches.

2. Connect the switch with two conductors (two-channel connection). Keep the channels

separate.

Note: If you use only one channel in a two-channel implementation, or if the channels

are connected together, the cross fault detection of the POUS relay detects a redundancy

fault and activates the fault reaction function.

Note: The safety circuit design can be different when modified according to the customer's

safety requirements. Refer to the circuit diagrams delivered with the drive.

3. Use shielded, twisted pair cables. ABB recommends double-shielded cable and

gold-plated contacts in the POUS switch.

Electrical installation 19

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