U L T R A F L E X H D P D U U S E R M A N U A L
3.2
AC Input
The AC input to the PDU can be configured as a 3 Phase Delta (with or without one leg grounded) or a 3
Phase Wye (Neutral not used). The AC feed must be capable of supplying a continuous current of 150A.
Voltage and frequency ratings are specified below.
3.2.1
Voltage
Power Supply operating voltage range is 187 – 253 VAC.
AC input operating range is 200/208 VAC.
3.2.2
Frequency
Frequency range is 47 – 63 Hz.
3.3
EMO supply
The PDU contains a 24V EMO supply that is wired directly to the AC input (before AC input breaker CB1).
This allows the EMO supply to be on as soon as the AC to the PDU is energized. The EMO supply is
protected by a 3A breaker (CB2) on the front panel of the PDU. The EMO supply is used to power the
interface PCB as well as the UVR (under voltage release) on the input circuit breaker CB1.
3.4
AC Input breaker
The AC input breaker is a three-phase 150A thermal magnetic circuit breaker and contains a UVR (under
voltage release). The UVR will not allow the breaker to be turned on unless 24V from the EMO supply is
provided to the breaker through the EMO loop. Conversely, the breaker will trip if the supplied 24V to the
breaker drops below 16 volts or the EMO loop is opened.
3.4.1
Lock Out Feature
The AC breaker can be locked in the off position by installing a padlock through the hole in the lockout
bracket. This will prevent anyone from turning on the PDU. Refer to
for a view of a lock installed.
Figure 13 – AC breaker lockout
708401 Rev B
Page 19 of 38
Lockout bracket
Breaker handle