4.1.8 Brake Cable for Adjustable Frequency
Drives with Factory-installed Brake
Chopper Option
(Only standard with letter B in position 18 of product type
code).
Use a shielded connection cable to the brake resistor. The
maximum length from the adjustable frequency drive to
the DC bar is limited to 25 m (82 ft).
Terminal number Function
81, 82 Brake resistor terminals
Table 4.6 Brake Resistor Terminals
The connection cable to the brake resistor must be
shielded. Connect the shield to the conductive backplate
on the adjustable frequency drive and to the metal cabinet
of the brake resistor with cable clamps.
Size the brake cable cross-section to match the brake
torque. See also the Instructions Brake Resistor and Brake
Resistors for Horizontal Applications for further information
regarding safe installation.
NOTICE!
Depending on the supply voltage, voltages up to 1099 V
DC may occur on the terminals.
F enclosure requirements
Connect the brake resistor to the brake terminals in each
inverter module.
4.1.9
Brake Resistor Temperature Switch
Torque: 0.5–0.6 Nm (5 in-lbs)
Screw size: M3
This input can be used to monitor the temperature of an
externally connected brake resistor. If the input between
104 and 106 is established, the adjustable frequency drive
trips on warning/alarm 27, Brake IGBT. If the connection is
closed between 104 and 105, the adjustable frequency
drive trips on warning/alarm 27, Brake IGBT.
Install a Klixon switch that is normally closed. If this
function is not used, short-circuit 106 and 104 together.
Normally closed: 104–106 (factory-installed jumper)
Normally open: 104–105
Terminal number Function
106, 104, 105 Brake resistor temperature switch.
Table 4.7 Terminals for Brake Resister Temperature Switch
NOTICE!
If the temperature of the brake resistor becomes too
high and the thermal switch drops out, the adjustable
frequency drive stops braking. The motor starts coasting.
4.1.10 Load Sharing
Terminal
number
Function
88, 89 Load sharing
Table 4.8 Terminals for Load Sharing
The connection cable must be shielded and the maximum
length from the adjustable frequency drive to the DC bar
is limited to 25 m (82 ft).
Load sharing enables the linking of the DC intermediate
circuits of several adjustable frequency drives.
WARNING
Voltages up to 1099 V DC may occur on the terminals.
Load sharing requires extra equipment and safety
considerations. For further information, see the
instructions Load Sharing.
WARNING
Line power disconnect may not isolate the adjustable
frequency drive due to DC link connection.
Electrical Installation Instruction Manual
MG11F522 Danfoss A/S © 08/2014 All rights reserved. 49
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