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Motors ON/Dual Run Chain Circuitry
Electrical
Troubleshooting Guide
IRB6400 M94A
5.5. Motor ON/Dual Run ChainMotor ON/Dual Run Chain
5.1 Overview
This chapter will discuss the MOTORS ON circuitry.
There will be two sections:
1. Manual Reduced or Manual Full Speed Mode
Circuitry
2. Auto Mode Circuitry.
Both sections will go through both run chain 1 & 2
circuits.
The Motors ON circuitry is made up of two series
circuits known as Run Chains. Diagram 1 (on the next
page) shows a representation of the dual Run Chain
circuits. The purpose of having two run chain circuits for
starting the motors is for safety. The two run chains
must have duplicate circuits. If a component fails (such
as a contact sticking) in either circuit, the other circuit
can still operate the safety circuits. The two circuits are
also powered in opposite directions for the purpose of
safety. (Run chain 1 starts at 24 VDC and goes to 0
VDC. Run chain 2 starts at 0 VDC and goes to 24 VDC.)
The two run chains control two relays (KM1 and KM2).
The contacts on these two relays supply power to the
Motor Drive System. If the run chains open, the KM
relay will open, removing power from the drive system.
If only one run chain is closed, a run chain error will be
given and power is removed from the Motor Drive
system.
The status of the run chains can be monitored on the
System board's (DSQC 256A) LEDs.
Back Plane is used for easy access to the individual
circuits for testing.
Capacitors rated at 100 nanofarads are used throughout
the circuits to reduce noise.
ABB is not responsible if safety equipment is not
connected and jumpers are used to bypass an open
circuit.
Fig. 5-1 ............
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