ABB recommends that you also wire the thermal switch to a digital input of the
drive, and configure the input to cause a fault trip at resistor overtemperature
indication.
L1 L2 L3
L1 L2 L3
K1
x +24V
x DIx
OFF
ON
1 3 5
2 4 6
1
2
13
14
3
4
Θ
1
2
3
4
5
Drive input power connection with a main contactor1
Drive2
Main contactor control circuit3
Brake resistor thermal switch4
Digital input. Monitors the brake resistor thermal switch.5
Mechanical and electrical installation of brake resistor
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or
death, or damage to the equipment can occur. If you are not a qualified
electrical professional, do not do installation, commissioning or
maintenance work.
WARNING!
Stop the drive and do the steps in section Electrical safety
precautions (page 16) before you start the work.
￭
Mechanical installation
Refer to the resistor manufacturer’s instructions.
158 Resistor braking
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