Protective Devices; Electrical Installation; Branch Circuit Protection - Baldor VS1MX Installation & Operating Manual

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.
Fast Action Fuses: 240VAC, Buss® KTN; 460VAC, Buss® KTS
Very Fast Action:
Semiconductor:
Buss® is a trademark of Cooper Industries, Inc.

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 M4 Fork 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.

4.4.1 Branch Circuit Protection

These devices require circuit protection. Branch circuit protection shall be provided. The size of the Branch Circuit Protection
Fuse shall be as shown in the ratings table or equivalent.
4.4.2 Single Phase Input Power Connections for 1 Phase Control
All cables must be shielded and the shields must be grounded at the enclosure cable entrance.
1. Connect the single phase input power wires to an appropriate interrupter and protection.
2. Connect the single phase AC input power leads to terminals L1/L and L2/N of the control (see Figure 4-2 for location).
3. Connect the power ground wire to the ground terminal.
4.4.3 Three Phase Input Power Connections for 3 Phase Control
All cables must be shielded and the shields must be grounded at the enclosure cable entrance.
1. Remove cover. Cover removal is described in Chapter 3 of this manual.
2. Connect the three phase input power wires to an appropriate interrupter and protection.
3. Connect the three phase AC input power leads to terminals L1/L. L2/N and L3 of the control (see Figure 4-2 for location).
4. Connect the power ground wire to the ground terminal (see Figure 4-2).
Size A,B,C
VS1MX10P5 shown
as an example
4-2 Power Wiring
240VAC, Buss® JJN; 460VAC, Buss® JJS
240VAC, Ferraz Shawmut A50QS
Figure 4-2 Wiring Locations
Size B & C
See Recommended Tightening Torques in Table 4-1.
Size A,B,C
VS1MX22 shown
as an example
Size A
L1/L L2/N L3
L1/L L2/N L3
U V
U V W
W + BR
MN762