Brake Resistor Temperature Switch; Additional Connections; Dc Bus Connection; Load Sharing - Danfoss VLT AutomationDrive FC 300 Design Manual

Electrical Installation
Figure 7.53 E- and F-Frame Additional Relay Outputs

7.5.11 Brake Resistor Temperature Switch

7 7
Frame Size D-E-F
Torque: 0.5‒0.6 Nm (5 in-lbs)
Screw size: M3
This input monitors 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 no.
106, 104, 105
Table 7.68 Brake Resistor Temperature Switch Terminals
NOTICE!
If the temperature of the brake resistor gets too high
and the thermal switch trips, the adjustable frequency
drive stops braking and the motor coasts.
Figure 7.54 Brake Resistor Temperature Switch Interconnect
232
Design Guide
Function
Brake resistor temperature switch.
106 104 105
NC C NO
Danfoss A/S © Rev. 2014-02-10 All rights reserved.

7.6 Additional Connections

7.6.1 DC Bus Connection

The DC bus terminal is used for DC backup, with the
intermediate circuit being supplied from an external
source.
Terminal no. Function
88, 89 DC Bus
Table 7.69 DC Bus Terminals
Contact Danfoss if further information is required.

7.6.2 Load Sharing

Load sharing calls for extra equipment and safety consider-
ations. For further information, Load Sharing Application
Note.
CAUTION
Note that voltages up to 1099 V DC may occur on the
terminals.
Terminal no. Function
88, 89 Load sharing
Table 7.70 Load Sharing Terminals
The connection cable must be shielded and the maximum
length from the adjustable frequency drive to the DC bar
is limited to 80 ft [25 m].
Load sharing links together the DC intermediate circuits of
several adjustable frequency drives.
WARNING
Note that a line power disconnect may not isolate the
adjustable frequency drive due to DC link connection

7.6.3 Installation of Brake Cable

The connection cable to the brake resistor must be
shielded and the maximum length from the adjustable
frequency drive to the DC bar is limited to 82 ft [25 m].
MG34S222