Electrical Connection Of Power Unit; Table 21: Tools; Table 22: Connection Data - nord NORDAC PRO SK 500E Series User Manual

SK 54xE – Users Manual for Frequency Inverters
2.9.4

Electrical connection of power unit

The following information relates to all power connections to the frequency inverter. This includes:
• Mains cable connection (L1, L2/N, L3, PE)
• Motor cable connection (U, V, W, PE)
• Brake resistor connection (B+, B-)
• Link circuit connection (-DC, (+DC))
• Link circuit choke connection (-DC, CP, PE)
Before connecting the frequency inverter, the following must be observed:
1. Ensure that the mains supply provides the correct voltage and is suitable for the current required.
2. Ensure that suitable circuit breakers with the specified nominal current range are installed between
the voltage source and the inverter.
3. Connect the mains voltage directly to the mains terminals L1-L2/N-L3-PE (for each device)
4. A four-core cable must be used to connect the motor. The cable is connected to the motor
terminals PE-U-V-W.
5. If screened motor cables (recommended) are used, the cable screening must also be connected to
a large area of the metallic screening angle of the EMC Kit, however, at least to the electrically
conducting mounting surface of the control cabinet.
6. Above size 8, the cable lugs which are included in the scope of delivery must be used. After
crimping, these must be insulated with shrink hose.
Information
The use of shielded cables is essential in order to maintain the specified radio interference suppression level.
If certain wire end sleeves are used, the maximum cross-section which can be connected can be reduced.
To connect the power unit, the following tools must be used:
Frequency inverter
Size 1 - 4
Size 5 - 7
Size 8 - 11

Table 21: Tools

Connection data:
Frequency inverter
Size
1 ... 4 0.2 ... 6
5 0.5 ... 16
6 0.5 ... 35
7 0.5 ... 50
8
9
10
11

Table 22: Connection data

58
Tools
Screwdriver SL / PZ1; SL / PH1
Screwdriver SL / PZ2; SL / PH2
Socket wrench SW 13
Cable Ø [mm²]
rigid flexible
0.2 ... 4
0.5 ... 10
0.5 ... 25
0.5 ... 35
50 50
95 95
120 120
150 150
Type
AWG Tightening torque
[Nm]
24-10 0.5 ... 0.6
20-6 1.2 ... 1.5
20-2 2.5 ... 4.5
20-1 2.5 ... 4
1/0 15
3/0 15
4/0 15
5/0 15
[lb-in]
4.42 ... 5.31
10.62 ... 13.27
22.12 ... 39.82
22.12 ... 35.4
135
135
135
135
BU 0505 EN-3021