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Vertiv™ NetSure™ 400V DC Power System User Manual
2.4 HRMG (High Resistance Midpoint Ground) Configuration (+/- 200V DC)
The HRMG configuration provides system voltages to ground at half of the output system voltage, for additional personnel safety.
That is, the HRMG version of 400V DC produces +/-200V DC to ground potentials. This configuration is used in applications where
an internal high resistance path is required between the positive output busbar and site ground and also the negative output busbar
and site ground.
The DC bus is continuously monitored for ground fault (insulation fault) conditions. If the insulation resistance between the +BUS or -
BUS to ground goes below a set value, a ground fault (insulation fault) alarm is generated and an alarm LED located on the front of
the Power Module/Bay's power and control section illuminates.
3 Operating Procedures
3.1 Controller and Rectifiers
For operation instructions on these units, refer to the following documents.
•
ACU+ Controller User Instructions (UM1M820NNB-3)
•
Rectifier Instructions (UM1R40015000e)
3.2 Battery Cabinet (if furnished)
For operation instructions on the Battery Cabinet, refer to the Battery Cabinet Installation and Operation Instructions
(IM58400120090).
3.3 Local Controls and Indicators
Refer to the controller and rectifier instructions for descriptions of the local controls and indicators located on these units.
Refer to this section for descriptions of the local controls and indicators located on the Power Module/Bay's power and control
section. Refer to Figure 3.1 and Figure 3.2 for location.
Main Power Module/Bay "Power and Control Section"
Main AC Input Circuit Breaker: A main AC input circuit breaker is provided to disconnect AC input power from the Main Power
Module/Bay's power and control section.
NOTE!
The main AC input circuit breaker has a system controlled trip mechanism to trip the breaker if an EPO signal is sent.
Optional Rectifier AC Input Circuit Breakers: Each rectifier has a separate AC input circuit breaker to disconnect AC input power
from the respective rectifier.
"Output Voltage Present" Indicator: Illuminates green to indicate voltage is present on the Main Power Module/Bay's DC output
bus.
"Control Voltage Present" Indicator: Illuminates green to indicate the converter power supply in the Main Power Module/Bay is
functioning. (If off when system is in operation, contact Vertiv Technical Support.) (The converter power supply provides 48V DC for
controls.)
"Ground/Insulation Fault Alarm" Indicator: Illuminates red to indicate a ground fault (insulation fault) related alarm condition
exists. (See "HRMG Configuration Ground Fault (Insulation Fault) Detection Circuit Operation" on page 5.)
WARNING! It is important to service and remove the ground fault (insulation fault) in the system as soon as the alarm is
indicated.
4
Proprietary and Confidential © 2022 Vertiv Group Corp.
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