Brake Resistor Connection - Lenze i550 Operating Instructions Manual

Electrical installation
Preparation Connection diagram
PTC input Networks


Brake resistor connection

NOTE

Overload
Possible consequences: Irreversible damage to the brake resistor

• Protect the brake resistor of the inverter against overload with suitable parameterization.
• The thermostat of the brake resistor can be used to establish a safety shutdown to

disconnect the inverter from the mains.
Recommendation: Use intrinsically safe brake resistors to be able to dispense with a separate

switch-off device (e.g. a contactor).
Short connection cables up to 0.5 m

Up to a cable length of 0.5 m, the cable for the brake
resistor and that of the temperature monitoring can
be twisted. This procedure reduces problems caused

by EMC interference.
R
B

RB1 RB2 T1 T2

① ②
Wiring to the "brake resistor" connection on the inverter or another component with brake chopper.
①
Optional: Wiring to a control contact that is set to monitor the thermal contact. If the thermal contact
responds, the voltage supply to the inverter must be disconnected (e.g. switch off the control of the
②
mains contactor).
© 11/2021 · EN · www.Lenze.com
1-phase | 120 V 1-phase | 230/240 V 3-phase | 230/240 V
Functional safety Safe torque off (STO)
Long connection cables up to max. 5 m
The cable of the brake resistor must be shielded
The maximum length is 5 m.
For the temperature monitoring cable, twisting is
sufficient.
R
B
RB1 RB2 T1 T2
+
"
"
① ②
3-phase | 400 V 3-phase | 480 V Brake resistor
Operating instructions i550 cabinet frequency inverter | 21
Control terminals Relay output