3. Electrical Installation
3.1. How to Connect
3.1.1. Electrical Installation in General
NB!
All cabling must comply with national and local regulations on cable cross-sections
and ambient temperature. Copper conductors required, (60-75° C) recommended.
Details of terminal tightening torques.
Power (kW) Torque (Nm)
Frame
1 x
200-240 V
3 x
200-240 V
3 x
380-480 V
Line Motor
DC con-
nection/
Brake
1)
Control
Terminals
Earth Relay
M1 0.18 - 0.75 0.25 - 0.75 0.37 - 0.75 1.4 0.7 - 0.15 3 0.5
M2 1.5 1.5 1.5 - 2.2 1.4 0.7 - 0.15 3 0.5
M3 2.2 2.2 - 3.7 3.0 - 7.5 1.4 0.7 - 0.15 3 0.5
1)
Spade connectors
Table 3.1: Tightening of terminals.
3.1.2. Fuses
Branch circuit protection:
In order to protect the installation against electrical and fire hazard, all branch circuits in an in-
stallation, switch gear, machines etc., must be short-circuited and overcurrent protected according
to national/international regulations.
Short circuit protection:
Danfoss recommends using the fuses mentioned in the following tables to protect service per-
sonnel or other equipment in case of an internal failure in the unit or short-circuit on DC-link. The
frequency converter provides full short circuit protection in case of a short-circuit on the motor or
brake output.
Overcurrent protection:
Provide overload protection to avoid overheating of the cables in the installation. Overcurrent
protection must always be carried out according to national regulations. Fuses must be designed
for protection in a circuit capable of supplying a maximum of 100,000 A
rms
(symmetrical), 480 V
maximum.
NonUL compliance:
If UL/cUL is not to be complied with, Danfoss recommends using the fuses mentioned in table
1.3, which will ensure compliance with EN50178:
In case of malfunction, not following the fuse recommendation may result in damage to the fre-
quency converter.
VLT Micro Drive FC 51 Operating Instructions 3. Electrical Installation
MG.02.A2.02 - VLT
®
is a registered Danfoss trademark
9
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