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Motors ON/Dual Run Chain Circuitry
Electrical
Troubleshooting Guide
IRB6400 M94A
Sheet 8, line 16 ............
Fig. 5-1,2 .........
5.2.7 Run Chain 2
Run Chain 2 has its power source supplied on the
System board's (DSQC 256A) LIM 2 LED (the right
one). The other side of the LED goes through a duplicate
of Run Chain 1 connections going to 0V. LIM 2 LED is
the only LED for Run Chain 2, because under normal
conditions, Run Chain 1 and Run Chain 2 have the
same status. To trace these circuits, we start at LIM 2
LED. Instead of checking for 24 VDC we will be checking
for 0 VDC.
This is done by connecting the red meter lead to a
known 24 VDC source, such as, XS3/XT3 terminal
D16, and putting the black lead on the terminal points.
If the meter reads 24 VDC the circuits are intact to 0V.
Remember while checking these circuits have someone
hold the enabling device in the center position.
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