Discharge Resistors - Danfoss VLT FC 102 Installation Manual

Electrical Installation

5.8.3 Discharge Resistors

There are common positive and negative DC terminals on each drive module. If a shorter time to achieve the reduced run
functionality is wanted, connect the external discharge resistor for quicker discharge of DC-link voltage. It is possible to
connect a discharge resistor in an additional cabinet, through a contactor. This discharge contactor should have an interlock
with the mains contactor/disconnector's auxiliary NC contacts to avoid a discharge when the drive system is powered.
Illustration 8.7 shows a 4-drive system with discharge resistor connections.
Base the selection of a discharge resistor on the energy and power levels given in Table 5.12 for different power sizes, on
both 12-pulse and 6-pulse systems.
5 5
FC 102
FC 202
FC 302
Drive modules required
(HO rating)
Resistance required to reduce DC
voltage below 50 V within 300 s
(5 minutes), Ω
Power rating of resistor (W)
Energy dissipated by resistor (J)
Table 5.12 Discharge Resistors Recommended for Drive Systems with 380–480 V AC Mains Supply
FC 102
FC 202
FC 302
Drive modules required
(HO rating)
Resistance required to reduce DC
voltage below 50 V within 300 s
(5 minures), Ω
Power rating of resistor (W)
Energy dissipated by resistor (J)
Table 5.13 Discharge Resistors Recommended for Drive Systems with 525–690 V AC Mains Supply
NOTICE
Danfoss is not responsible for any failure or malfunction of the resistor, or for any misconnections made by the installer.
NOTICE
The wire used with the brake resistor should be double-insulated or have reinforced insulation.
30
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VLT Parallel Drive Modules
N500 N560
N450 N500
2xN250 4xN160
3036 2277
182 242
7773 10365
N630 N710
N560 N630
2xN315 4xN200
4571 3047
230 345
8819 13229
Danfoss A/S © 08/2017 All rights reserved.
N630 N710
N560 N630
4xN200 4xN200
1822 1822
303 303
12956 12956
N800 N900
N710 N800
4xN250 4xN250
2285 2285
459 459
17638 17638
N800 N1M0
N710 N800
4xN250 4xN250
1518 1518
363 363
15547 15547
N1M0 N1M2
N900 N1M0
4xN315 4xN315
2285 2285
459 459
17638 17638
MG37K302