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Ensure that the incoming supply neutral is solidly connected (bonded) to the same building power
distribution ground. Grounding must not rely on flexible cables and should not include any form of
plug or socket that would permit inadvertent disconnection. Some local codes may require redundant
ground connections. The integrity of all connections should be checked periodically.
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 surrounding 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:
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 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 branch 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).
4-2 Power Wiring
240VAC, Buss® KTN; 460VAC, Buss® KTS
240VAC, Buss® JJN; 460VAC, Buss® JJS
240VAC, Ferraz Shawmut A50QS
MN762S
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