LEESON SM-Basic Series Sub-Micro Inverters (Obsolete) - Manual (Page 12)

8
Minimum voltage rating of the protection device should be 250 Vac for 120/208/240 Vac and 208/
240 Vac rated drives.
UL Class CC fast-acting, current limiting type fuses should be used when input fusing is required.
Select fuses with low I
2 T values, rated at 200,000 AIC. Recommended fuses are Bussman KTK-R.
Similar fuses with equivalent ratings by other manufacturers may also be acceptable.
8.0 POWER WIRING
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.
Strip off 0.20 to 0.25 inches of insulation for input power, output power, and DC Bus wiring. The
input power, output power, and DC Bus terminals must be tightened to a torque of 4.0 to 4.5 lb-in.
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-Basic POWER WIRING DIAGRAM.
If the drive is rated for 208/240 Vac single phase input, wire the input to terminals L1 and L2.
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.
Do not install contactors or disconnects between the drive and motor without consulting Leeson
Electric Corporation for more information.
WARNING!
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.