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 connec-
tion/Brake
1)
Control Ter-
minals
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 (6.3 mm Faston plugs)
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 installation, 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 personnel 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.
a circuit capable of supplying a maximum of 100,000 A
rms
(symmetrical), 480 V maximum.
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.
Non UL compliance:
If UL/cUL is not to be complied with, Danfoss recommends using the fuses mentioned in the below table, which will ensure compliance with EN50178/
IEC61800-5-1:
In case of malfunction, not following the fuse recommendation may result in damage to the frequency converter.
VLT
®
Micro Drive FC 51 Operating Instructions
3 Electrical Installation
MG.02.A4.02 - VLT
®
is a registered Danfoss trademark
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