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4.2
Power Disconnect
A power disconnect should be installed between the input power service and the drive for a fail safe
method to disconnect power. The drive will remain in a powered‐up condition until all input power is
removed from the drive and the internal bus voltage is depleted.
4.3
Protective Devices
Recommended fuse sizes are based on the following:
115% of maximum continuous current for time delay.
150% of maximum continuous current for Fast or Very Fast action.
Note:
These recommendations do not consider harmonic currents or ambient temperatures greater than
45°C.
Be sure a suitable input power protection device is installed. Use the recommended fuses and wire sizes
shown in Table 4‐1 is based on the use of copper conductor wire rated at 75 °C. The table is specified
for NEMA B motors.
4.4
Electrical Installation
All interconnection wires between the drive, AC power source, motor, host control and any operator
interface stations should be in metal conduits or shielded cable must be used. Use listed closed loop
connectors that are of appropriate size for wire gauge being used. Connectors are to be installed using
crimp tool specified by the manufacturer of the connector. Only class 1 wiring should be used.
Table 4‐1 Fuse & Wire Size and Terminal Tightening Torque Specifications
Catalog Number
VS1SM80PF, VS1SM80P5-F
VS1SM81, VS1SM81-F
VS1SM82, VS1SM82-F
VS1SM83, VS1SM83-F
Note: Wire sizes based on 75°C copper wire. Fuses based on 45°C ambient, max continuous output and no
harmonic current.
4.4.1
Input Power Connections
All cables must be shielded and the shields must be grounded at the enclosure cable entrance.
1.
Connect the line L1, L2 to the Power Terminal Strip, Figure 4‐3.
2.
Connect the motor leads to U, V and W terminals, Figure 4‐2.
3.
Connect motor ground to the ground terminal
the fan (see Figure 3‐2 for location).
4-2 Power Wiring
Fast Action Fuses:
Very Fast Action:
Semiconductor
Buss® is a trademark of Cooper Industries, Inc.
Input Fuse (Amps)
Fast Acting (UL)
10A
20A
30A
40A
240VAC, Buss® KTN; 460VAC, Buss® KTS
240VAC, Buss® JJN; 460VAC, Buss® JJS
240VAC, Ferraz Shawmut A50QS
Wire Gauge
AWG
mm
14
2.5
14
2.5
12
4.0
12
4.0
located in the opening at the rear of the drive by
Tightening Torque
2
lb-in
9
9
15
15
MN761
Nm
4.5
4.5
1.7
1.7
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