Section 1
General Information
Receiving & Installation 3-13
MN715
Single Phase Input Power Considerations Single phase operation of G and H size controls is not possible.
Single phase AC input power can be used to power the control instead of three phase for
control sizes A, B, B2, C, C2, D, D2, E and F. The specifications and control sizes are
listed in Section 6 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 3 wire connections are standard in the
USA. However, single phase 2 wire connection is used in most of the world. Both
connections types are shown.
Single phase rating wire size and protection devices are listed in Tables 3-6 and 3-7.
Single Phase Control Derating: Single phase power derating requires that the continuous and peak current ratings
of the control be reduced by the following percentages:
1.
1-2 hp 230 and 460VAC controls:
No derating required.
2.
3-25 hp (Size B, B2 and C2) 230 and 460VAC controls:
Derate hp by 40% of the nameplate rating.
3.
15 hp (Size C, D2) and Larger 230 and 460VAC controls:
Derate hp by 50% of the nameplate rating.
Size A, B and B2 Single Phase Power Installation
(See Figure 3-6).
Jumper Configuration
Size A, B and B2 controls, no jumper changes required.
Figure 3-6 Size A, B & B2 Single Phase 230/460VAC Power and Motor Connections
L1
L2
L1
L2
L3
* Circuit
Breaker
Earth
See Recommended Tightening Torques in Section 6.
Note 3
Baldor
Series 15H
Control
*Optional
Line
Reactor
Note 1
Note 3
A1
B1
A2
B2
Note 4
Notes:
1.
See “Protective Devices” described previously in this section.
2.
Use same gauge wire for Earth ground as is used for L1, L2 and L3.
3.
Metal conduit should be used. Connect conduits so the use of a
Reactor or RC Device does not interrupt EMI/RFI shielding.
4.
See Line/Load Reactors described previously in this section.
Note 2
L1
L2
* Fuse
Connection
Note 1
*
Optional components
not provided with control.
A1
B1
L1 Neutral
* Circuit
Breaker
*Line
Reactor
A1
A2
Single phase 2 wire Connections
Single phase 3 wire Connections
