Drive System Boards; Rectifier; Diagram 9-2 Rectifier - ABB IRB6400 Electrical Troubleshooting Manual

Motor & Resolver Circuitry
Sheet 12, line 20 ..........
Sheet 9, line 04 ............
Fig. 9-2 ............
Sheet 12, line 16 ..........
Fig. 9-2 ............
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9.3

Drive System Boards

The Drive System is a PWM (pulse width modulated)
drive. The components of the drive system consists of
a back plane, a drive rectifier (DC-Link) and six axes
drive boards (one for each axis).
9.3.1

Rectifier

The Rectifier (also known as DC-Link) is the drive
power supply. Its main purpose is to convert 262 VAC
on terminals 22, 24, 26, 28, 30 and 32 to 340 VDC, and
to supply this voltage to the axis drive boards across the
drive back plane.
When the computer is initializing, it checks the rectifier
first. Then the computer checks the Axes boards. This
communication is performed through the 64 pin ribbon
cable. The drive rectifier uses the KM3 relay contacts
and two 10 ohm resistors when starting to put a resistive
load on the power going to the capacitors to protect the
system from an inrush of current when the rectifier has
power but to it.
3 PHASE
RECTIFIER
262 Vac
Diagram 9-2
The Rectifier also has circuitry referred to as Dynamic
Braking circuits. This circuitry consists of heavy duty
resistors which are used whenever the motors go into
a deceleration. The resister will absorb the current fed
back from the motors causing an electronic braking
action on the motor.
KM3
61 62
71 72
81 82
10 ohm
10 ohm
Rectifier
Electrical
Troubleshooting Guide
IRB6400 M94A
340 Vdc