Single Phase Input Power Considerations; Single Phase Control Derating; Size A And B Single Phase Power Installation - Baldor 18H Series Installation & Operating Manual

Single Phase Input Power Considerations

Single Phase Control Derating: Single phase power derating requires that the continuous and peak current ratings

Size A and B Single Phase Power Installation

3-18 Receiving & Installation
Caution: Do not connect AC power to the Motor terminals T1, T2 and T3.
Connecting AC power to these terminals may result in damage to
the control.
Caution: Baldor recommends not using "Grounded Leg Delta" transformer
power leads that may create ground loops and degrade system
performance. Instead, we recommend using a four wire Wye.
Single phase AC input power can be used to power the control instead of three phase for
control sizes A, B, C, D, E and F. Single phase operation of G size controls is not
possible. The specifications and control sizes are listed in Section 7 of this manual. If
single phase power is to be used, the rated Horsepower of the control may have to be
reduced (derated). In addition, power wiring and jumper changes are required.
Single phase rating wire size and protection devices are listed in Tables 3-7 and 3-8.
of the control be reduced by the following percentages:
1. 1-2 HP 230 and 460 VAC controls:
No derating required.
2. 3-15 HP (Size B) 230 and 460 VAC controls:
Derate HP by 40% of the nameplate rating.
3. 15 HP (Size C) and Larger 230 and 460 VAC controls:
Derate HP by 50% of the nameplate rating.
Jumper Configuration
Size A and B controls, no jumper changes required.
Power and Control Connections
The single phase power and motor connections are shown in Figure 3-4.
1. Connect the incoming power wires to Main Circuit Terminals L1 and L2.
2. Place a jumper across control power input terminals L2 and L3. Use the same
size wire for the jumper as the incoming power wires on L1 and L2.
3. Connect earth ground to the " " of the control. Be sure to comply with local
codes.
Note: Use same gauge wire for earth ground as is used for L1, L2 and L3
connections. Refer to the Wire Size and Protection Devices tables
shown previously in this section.
4. Connect the three phase power leads of the AC motor to terminals T1, T2, and
T3 of the Main Circuit Terminals.
5. Connect motor ground wire to the " " of the control. Be sure to comply with all
applicable codes.
Note: In steps 3 and 5 grounding by using conduit or panel connection is not
adequate. A separate conductor of the proper size must be used as a ground
conductor.
MN718