4 Electrical installation
4.1 How to connect
4.1.1 Cables General
NB!
For the VLT HVAC Drive High Power series mains and motor connections, please see VLT HVAC Drive
High Power Operating Instruc-
tions
MG.11.FX.YY
.
NB!
Cables General
All cabling must comply with national and local regulations on cable cross-sections and ambient temperature. Copper (60/75 °C)
conductors are recommended.
Details of terminal tightening torques.
Power (kW) Torque (Nm)
Enclo-
sure
200-240
V
380-480
V
525-600
V
Mains Motor
DC connec-
tion
Brake Earth Relay
A2 1.1 - 3.0 1.1 - 4.0 1.8 1.8 1.8 1.8 3 0.6
A3 3.7 5.5 - 7.5 1.1 - 7.5 1.8 1.8 1.8 1.8 3 0.6
A5 1.1 - 3.7 1.1 - 7.5 1.1 - 7.5 1.8 1.8 1.8 1.8 3 0.6
B1 5.5 - 11 11 - 18.5 - 1.8 1.8 1.5 1.5 3 0.6
B2
-
15
22
30
-
-
4.5
4.5
2)
4.5
4.5
2)
3.7
3.7
3.7
3.7
3
3
0.6
0.6
B3 5.5 - 11 11 - 18.5 11 - 18.5 1.8 1.8 1.8 1.8 3 0.6
B4 11 - 18.5 18.5 - 37 18.5 - 37 4.5 4.5 4.5 4.5 3 0.6
C1 18.5 - 30 37 - 55 - 10 10 10 10 3 0.6
C2 37 - 45 75 - 90
-
-
14/24
1)
14/24
1)
14 14 3 0.6
C3 18.5 - 30 37 - 55 37 - 55 10 10 10 10 3 0.6
C4 30 - 45 55 - 90 55 - 90
14/24
1)
14/24
1)
14 14 3 0.6
D1/D3 - 110 - 132 110 - 132 19 19 9.6 9.6 19 0.6
D2/D4 - 160-250 160-315 19 19 9.6 9.6 19 0.6
E1/E2 - 315-450 355-560 19 19 19 9.6 19 0.6
F1-F4
3)
-
Table 4.1: Tightening of terminals
1) For different cable dimensions x/y, where x ≤ 95 mm² and y ≥ 95 mm²
2) Cable dimensions above 18.5 kW ≥ 35 mm
2
and below 22 kW ≤ 10 mm
2
3) For data on the F-series please consult VLT
®
HVAC Drive High Power Operating Instructions, MG.11.F1.02
4.1.2 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-circuit
and over-current protected according to the national/international regulations.
Short circuit protection
The frequency converter must be protected against short-circuit to avoid electrical or fire hazard. Danfoss recommends using the fuses mentioned below
to protect service personnel or other equipment in case of an internal failure in the unit. The frequency converter provides full short circuit protection in
case of a short-circuit on the motor output.
Over-current protection
Provide overload protection to avoid fire hazard due to overheating of the cables in the installation. Over current protection must always be carried out
according to national regulations. The frequency converter is equipped with an internal over current protection that can be used for upstream overload
protection (UL-applications excluded). See par. 4-18
Current Limit
in the
VLT HVAC Drive Programming Guide
. Fuses must be designed for protection in
a circuit capable of supplying a maximum of 100,000 A
rms
(symmetrical), 500 V/600 V maximum.
VLT
®
HVAC Drive Operating Instructions 4 Electrical installation
MG.11.A9.02 - VLT
®
is a registered Danfoss trademark
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