4.1.8 Brake Cable for Frequency Converters
with Factory Installed Brake Chopper
Option
(Only standard with letter B in position 18 of typecode).
The connection cable to the brake resistor must be
screened and the max. length from frequency converter to
the DC bar is limited to 25 m (82 ft).
Terminal No. Function
81, 82 Brake resistor terminals
Table 4.8 Terminals for Brake Resistor
The connection cable to the brake resistor must be
screened. Connect the screen with cable clamps to the
conductive back plate at the frequency converter and to
the metal cabinet of the brake resistor.
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.
WARNING
Note that voltages up to 1099 V DC, depending on the
supply voltage, may occur on the terminals.
F enclosure requirements
The brake resistor(s) must be connected 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 No. Function
106, 104, 105 Brake resistor temperature switch.
Table 4.9 Terminals for Brake Resister Temperature Switch
NOTICE
If the temperature of the brake resistor gets too high
and the thermal switch drops out, the frequency
converter stops braking. The motor starts coasting.
4.1.10 Load Sharing
Terminal No. Function
88, 89 Loadsharing
Table 4.10 Terminals for Load Sharing
The connection cable must be screened and the max.
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 calls for extra equipment and safety
considerations. For further information, see the
instuctions Load Sharing.
WARNING
Mains disconnect may not isolate the frequency
converter due to DC-link connection.
4.1.11 Shielding against Electrical Noise
Before mounting the mains power cable, mount the EMC
metal cover to ensure best EMC performance.
NOTICE
The EMC metal cover is only included in units with an
RFI filter.
Electrical Installation VLT HVAC Drive FC 102 Operating Instructions
58 MG11F402 - Rev. 2013-12-16
44
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