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Power Unit Circuitry
Electrical
Troubleshooting Guide
IRB6400 M94A
The KM3 relay has four sets of normally open contacts
and four sets of normally closed contacts:
Normally OPEN contacts 53 and 54 are used to
bypass XS3/XT3 terminals D1 and D2 so the customer
no longer has control of KM3 on the 0 VDC side.
Normally OPEN contacts 13 and 14 bypass XS3/XT3
terminals C1 and C2 so the customer no longer has
control of KM3 on the 24 VDC side. Then bypasses
KM4 contacts 21 and 22. 24 VDC now goes through
KM1 Normally closed contacts 21 and 22 and KM2
normally closed contacts 21 and 22, keeping KM3
energized.
Normally OPEN contacts 33 and 34 are used to allow
KM1 to be energized.
Normally OPEN contacts 43 and 44 are used to allow
KM2 to be energized.
Normally CLOSED contacts 21 and 22 are used to
allow KM4 (the brake relay) to energize only when KM3
is not energized.
Normally CLOSED contacts 62, 72, 82 and 61, 71, 81
are used for only that instant when KM1 and KM2 are
energized and KM3 has not yet de-energized, to supply
a load for the drive system rectifier. This is to eliminate
a high inrush of current through its capacitors. If this
circuit is not working properly serious damage to drive
rectifier and drive boards could result.
The diagram below shows how these contacts work
with the Drive Rectifier.
KM3 (Cont)
Sheet 9, line 05 ............
Fig. 7-1 ............
Sheet 9, line 06 ............
Sheet 9, line 05 ............
Sheet 9, line 04 ............
Sheet 9, line 04 ............
Sheet 9, line 04 ............
Sheet 9, line 05 ............
Sheet 12, line 12 ..........
Diagram 7-1
Rectifier
Board
61 62
71 72
81 82
10 ohm
10 ohm
262 Vac
340 Vdc
3 PHASE
RECTIFIER
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