Electrical Installation; How To Connect - Danfoss VLT HVAC Drive Instruction Manual

VLT ® HVAC Drive Instruction Manual

4. Electrical installation

4.1. How to connect

4.1.1. Cables General
Details of terminal tightening torques.
Enclo-
sure
A2
A3
A5
B1
B2
C1
C2
Table 4.1: Tightening of terminals.
4.1.2. Fuses
Branch circuit protection
In order to protect the installation against electrical and fire hazards, all branch circuits in an
installation, switch gear, machines, etc. must be protected from both short circuit and overcurrent
in accordance with national/international regulations.
Short circuit protection
The adjustable frequency drive must be protected against short circuit in order to avoid electrical
or fire hazard. Danfoss recommends using the fuses mentioned in tables 4.3 and 4.4 in order to
protect service personnel and equipment in case of an internal failure in the unit. The adjustable
frequency drive provides full short circuit protection in case of a short circuit on the motor output.
Overcurrent protection
Provide overload protection to avoid fire hazard due to overheating of the cables in the installation.
Overcurrent protection must always be provided according to national regulations. The adjustable
frequency drive is equipped with internal overcurrent protection that can be used for upstream
overload protection (UL applications excluded). See
NOTE
Cables General
Always comply with national and local regulations on cable cross-sections.
Power (kW)
200-240 380-480 525-600
V V V
1.1 - 3.0 1.1 - 4.0 1.1 - 4.0
3.7 5.5 - 7.5 5.5 - 7.5
1.1 - 3.7 1.1 - 7.5 1.1 - 7.5
5.5 - 11 11 - 18.5 -
- 22 -
15 30 -
18.5 - 30 37 - 55 -
37 75 -
45 90 -
MG.11.A4.22 - VLT ® is a registered Danfoss trademark
Torque (Nm)
DC con-
Line Motor Brake
nection
1.8 1.8 1.8
1.8 1.8 1.8
1.8 1.8 1.8
1.8 1.8 1.5
2.5 2.5 3.7
4.5 4.5 3.7
10 10 10
14 14 14
24 24 14
VLT ® HVAC Drive Programming Guide, par.
4. Electrical installation
Ground Relay
1.8 3 0.6
1.8 3 0.6
1.8 3 0.6
1.5 3 0.6
3.7 3 0.6
3.7 3 0.6
10 3 0.6
14 3 0.6
14 3 0.6
4
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