Electrical
Troubleshooting Guide
IRB6400 M94A
Page 7 - 4
Power Unit Circuitry
7.2
KM1
The KM1 Relay is the end of Run Chain 1.
If Run Chain 1 is closed and the computer has no faults,
then 24 VDC will go through KM3 contacts to terminal
A2. (A1 and A2 are the coil terminals of the KM relays.)
The A1 terminal is connected to 0 VDC.
The KM1 relay has 6 sets of normally open contacts and
2 sets of normally closed contacts:
Normally OPEN contacts
44 and 43
are used to latch/
bypass around KM3 relay contacts 33 and 34.
Normally OPEN contacts
7 and 8
are used along with
KM2 and KM4 contacts to release the brakes on the
robot.
Normally OPEN contacts
33 and 34
connected to
XS3/XT3 terminals A13 and A14 are supplied for the
customer to use to indicate when KM1 is energized.
Normally OPEN contacts
2, 4, 6, and 1, 3, 5
are the
power contacts on KM1. 262 VAC is on contacts 2, 4,
and 6 when the control is power up. When KM1 is
energized power will go out contacts 1, 3 and 5 to KM2
contacts.
Normally CLOSED contacts
11 and 12
along with
KM2 contacts are used to tell the system board that the
KM1 relay is not energized.
Normally CLOSED contacts
21 and 22
are used to
bypass the Motors Hold Off circuits on XS3/XT3 terminal
C1 and C2.
Sheet 9, line 08 ............
Fig. 7-1 ............
Sheet 9, line 07 ............
Sheet 9, line 08 ............
Sheet 9, line 08 ............
Sheet 9, line 19 ............
Sheet 9, line 08 ............
Sheet 9, line 08 ............
Sheet 9, line 08 ............
Fig. 7-2 ............
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