Three Phase Input Power - Baldor 18H Series Installation & Operating Manual

Section 1
General Information

Three Phase Input Power

MN718
Three phase AC power and motor connections are shown in Figure 3-3. Overloads are
not required. The 18H control has an electronic I
overloads are desired, they should be sized according to the manufacturers specifications
and installed between the motor and the T1, T2 and T3 terminals of the control.
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.
1. Connect the incoming AC power wires from the protection devices to L1, L2
and L3 at the Main Circuit Terminals. The phase rotation is not important as the
control is not phase sensitive.
2. * 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.
3. Connect the three phase power leads of the AC motor to terminals T1, T2, and
T3 of the Main Circuit Terminals.
4. * Connect motor ground wire to the " " of the control. Be sure to comply with
all applicable codes.
* Grounding by using conduit or panel connection is not adequate. A separate
conductor of the proper size must be used as a ground conductor.
2 t motor overload protection. If motor
Receiving & Installation 3-15