LEESON SM-Plus Series Sub-Micro Inverters - Manual (Page 16)

8.0 POWER WIRING
Hazard of electrical shock! Capacitors retain charge after power is removed. Disconnect
incoming power and wait until the voltage between terminals B+ and B- is 0 VDC before servicing the
drive.
Note drive input and output current ratings and check applicable electrical codes for required wire type
and size, grounding requirements, over-current protection, and incoming power disconnect, before
wiring the drive. Size conservatively to minimize voltage drop.
Refer to Section 9.0 - SCF POWER WIRING DIAGRAM for information on torque and wire stripping
requirements for power wiring.
Input fusing and a power disconnect switch or contactor MUST be wired in series with terminals L1, L2,
and L3 for three phase input models. For 208/240 Vac single phase input models, use terminals L1 and
L2. For 120 Vac single phase input models, use terminals L1 and N. This disconnect must be used to
power down the drive when servicing, or when the drive is not to be operated for a long period of time,
but should not be used to start and stop the motor.
Repetitive cycling of a disconnect or input contactor (more than once every two minutes) may
cause damage to the drive.
8.1 WIRING FOR SINGLE PHASE OR THREE PHASE INPUT
If the drive is rated for 120/208/240 Vac single phase input, wire the input to terminals L1 and N for
120 Vac voltage, or wire to terminals L1 and L2 (do not wire to N) for 208/240 Vac input voltage. Refer
to Section 9.0 - SM-Plus
™ POWER WIRING DIAGRAM.
If the drive is rated for single and three phase input, wire to terminals L1 and L2 for single phase input,
or wire to terminals L1, L2, and L3 for three phase input.
If the drive is rated for three phase input, wire the input to terminals L1, L2, and L3.
All three power output wires, from terminals T1, T2, and T3 to the motor, must be kept tightly bundled
and run in a separate conduit away from all other power and control wiring.
It is not recommended to install contactors or disconnect switches between the drive and motor.
Operating such devices while the drive is running can potentially cause damage to the drive’s power
components. If such a device is required, it should only be operated when the drive is in a STOP state.
If there is potential for the device to be opened while the drive is running, the drive must be programmed
for COAST to stop (see Parameter 4 - STOP METHOD), and an auxiliary contact on the device must
be interlocked with the drive’s run circuit. This will give the drive a stop command at the same time the
device opens, and will not allow the drive to start again until the device is closed.
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