Brake Cable For Frequency Converters With Factory-Installed Brake Chopper Option; Brake Resistor Temperature Switch; Load Sharing; Shielding Against Electrical Noise - Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual

Electrical Installation
4.1.8 Brake Cable for Frequency Converters
with Factory-installed Brake Chopper
Option
(Only standard with letter B in position 18 of product type
code).
Use a screened connection cable to the brake resistor. The
maximum length from the frequency converter 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
screened. Connect the screen to the conductive back plate
on the frequency converter 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 frequency converter trips
on warning/alarm 27, Brake IGBT. If the connection is closed
between 104 and 105, the frequency converter 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
MG11F502
Operating Instructions
NOTICE
If the temperature of the brake resistor becomes too
high and the thermal switch drops out, the frequency
converter stops braking. The motor starts coasting.

4.1.10 Load Sharing

Terminal
number
88, 89
Table 4.8 Terminals for Load Sharing
The connection cable must be screened and the maximum
length from the frequency converter to the DC bar is
limited to 25 m (82 ft).
Load sharing enables linking of the DC intermediate
circuits of several frequency converters.
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
Mains disconnect may not isolate the frequency
converter due to DC link connection.

4.1.11 Shielding against Electrical Noise

To ensure best EMC performance, mount the EMC metal
cover before mounting the mains power cable.
NOTICE
The EMC metal cover is only included in units with an
RFI filter.
Danfoss A/S © 08/2014 All rights reserved.
Function
Load sharing
4 4
45