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
The operating switch and the indication lamp for the POUS function are not factory-installed.
The user must install and wire 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.
Wire the POUS switch to the appropriate terminals inside the drive cabinet. For the POUS
indication lamp [P], we recommend an LED indication lamp. See the circuit diagrams
delivered with the drive. Obey the rules below:
1.
Use only double-contact switches. We recommend approved and lockable switches.
2.
Connect the switch with two conductors (two-channel connection).
Note:
Keep the channels separate. Otherwise the cross-fault detection of the POUS
safety relay trips.
3.
Use shielded, twisted pair cables. We recommend a double-shielded cable and
gold-plated contacts in the POUS switch.
4.
Make sure that the sum resistance for one channel (loop resistance) does not exceed
70 ohms.
5.
Obey the general control cable installation instructions given in the drive hardware
manual.
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