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Power Unit Circuitry
Electrical
Troubleshooting Guide
IRB6400 M94A
7.7. Power UnitPower Unit
7.1 Overview
The power unit is located on top of the swing gate and
is made up of four 24 VDC relays made by ABB.
The four relays are:
KM1 — Motors ON Relay 1
KM2 — Motors ON Relay 2
KM3 — Supervisory Relay
KM4 — Brake Release Relay
The coils of all four relays have noise suppression
devices (RV1-3 and V3) connected to the coil terminals
A1 and A2. In this section we will explain the operation
of these relays and wiring of the relays.
Fig. 7-1 ............
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