ABB ACS560 Quick Installation And Start-Up Manual page 146

146 Diagnostics
Code Warning/Aux
(hex) code (aux code
visible only on
assistant con-
trol panel and
drive composer)
A784 Motor discon-
nect
EN
HI
A791 Brake resistor
A792 Brake resistor
wiring
A793 BR excess tem-
perature
1 - Resistance value too low
2 - Thermal time constant not given
A794 BR data
A79C BC IGBT excess
temperature
A7AB Built in/Exten-
sion I/O configur-
ation failure
Cause
All three output phases
are disconnected from
motor.
Brake resistor fault.
Brake resistor short cir-
cuit or fault in brake
chopper.
Brake resistor temperat-
ure exceeded warning
limit.
No brake resistor data.
Brake chopper IGBT tem-
perature exceeded intern-
al warning limit.
The I/O built in/extension
module is not connected
to the device properly.
What to do
Check if parameter 95.26 enables
the use of a motor disconnect
switch. If not, check the following:
• All switches between drive and
motor are closed.
• All cables between drive and
motor are connected and se-
cured.
If no issue was detected and drive
output was actually connected to
motor, contact ABB.
Check brake resistor.
Check brake chopper and brake
resistor connections.
Stop the drive. Let resistor cool
down. Check resistor overload pro-
tection function settings, warning
limits, resistor dimensioning and
braking cycle limits.
3 - maximum continuous power not
given
Check resistor data settings.
Let chopper cool down. Check am-
bient temperature, cooling fan, air
flow, cabinet cooling, resistor
overload protection function set-
tings, chopper resistor value, brak-
ing cycle and supply voltage.
Make sure that the I/O built in/ex-
tension module is connected to the
device.