Baldor 18H Series Installation & Operating Manual page 11

Section 1
General Information
2-4 General Information
Caution: To prevent equipment damage, be certain that the electrical service
is not capable of delivering more than the maximum line short
circuit current amperes listed for 230 VAC, 460 VAC or 575 VAC
control rating.
Caution: Disconnect motor leads (T1, T2 and T3) from control before you
perform a "Megger" test on the motor. Failure to disconnect motor
from the control will result in extensive damage to the control. The
control is tested at the factory for high voltage / leakage resistance
as part of Underwriter Laboratory requirements.
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.
Caution: Do not supply any power to the External Trip (motor thermostat)
leads at J1-16 and 17. Power on these leads can damage the
control. Use a dry contact type that requires no external power to
operate.
MN718