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 contactor
1
Drive
2
Main contactor control circuit
3
Brake resistor thermal switch
4
Digital input. Monitors the brake resistor thermal switch.
5
■
Protecting the resistor cable against short-circuits
The input fuses will also protect the resistor cable when it is identical with the
input cable.
Mechanical installation
The brake chopper and brake resistors must be installed outside the drive. Obey
the resistor manufacturer’s instructions.
Electrical installation
■
Measuring the installation
Follow the instructions given under
Measuring the insulation resistance of the
brake resistor circuit (page 93)
.
Resistor braking 247
Содержание ACH580-31
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