8 Electrical Installation
8.1 Connections Frame Sizes A, B and C
NOTE!
Cables General
All cabling must comply with national and local regulations on cable cross-sections and ambient temperature. Copper (167°F [75°C])
conductors are recommended.
Aluminum Conductors
Terminals can accept aluminum conductors, but the conductor surface must be clean, and the oxidation must be removed and sealed by neutral acid-
free Vaseline grease before the conductor is connected.
Furthermore, the terminal screw must be retightened after two days due to softness of the aluminum. It is crucial to keep the connection a gas-tight
joint, otherwise the aluminum surface will oxidize again.
Tightening-up Torque
Frame size 200–240 V
380–500 V
525–690 V
Cable for:
Tightening torque
A1
0.34–2 hp
[0.25-1.5
kW]
0.5–2 hp
[0.37–1.5
kW]
-
Line power, brake resistor, load sharing, motor cables
0.5–0.6 Nm
A2
0.34–3 hp
[0.25–2.2
kW]
0.5–5 hp
[0.37–4 kW]
-
A3
4–5 hp [3–
3.7 kW]
7.5–10 hp
[5.5–7.5
kW]
-
A5
4–5 hp [3–
3.7 kW]
7.5–10 hp
[5.5–7.5
kW]
-
B1
7.5–10 hp
[5.5–7.5
kW]
15–20 hp
[11–15 kW]
-
Line power, brake resistor, load sharing, motor cables
1.8 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
B2
15 hp [11
kW]
25–30 hp
[18.5–22
kW]
15–30 hp
[11–22 kW]
Line power, brake resistor, load sharing cables
4.5 Nm
Motor cables
4.5 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
B3
7.5–10 hp
[5.5–7.5
kW]
15–20 hp
[11–15 kW]
-
Line power, brake resistor, load sharing, motor cables
1.8 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
B4
15–20 hp
[11–15 kW]
25–40 hp
[18.5–30
kW]
-
Line power, brake resistor, load sharing, motor cables
4.5 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
C1
20–30 hp
[15–22 kW]
40–60 hp
[30–45 kW]
-
Line power, brake resistor, load sharing cables
10 Nm
Motor cables
10 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
C2
40–50 hp
[30–37 kW]
75–100 hp
[55–75 kW]
40–100 hp
[30–75 kW]
Line power, motor cables
14 Nm (up to 0.15 in
2
[95
mm
2
])
24 Nm (over 0.15 in
2
[95
mm
2
])
Load sharing, brake cables
14 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
C3
25–30 hp
[18.5–22
kW]
40–50 hp
[30–37 kW]
-
Line power, brake resistor, load sharing, motor cables
10 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
C4
50–60 hp
[37–45 kW]
75–100 hp
[55–75 kW]
-
Line power, motor cables
14 Nm (up to 0.15 in
2
[95
mm
2
])
24 Nm (over 0.15 in
2
[95
mm
2
])
Load sharing, brake cables
14 Nm
Relay
0.5–0.6 Nm
Ground
2–3 Nm
FC 300 Design Guide
8 Electrical Installation
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
8-1
8
