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NetSure™ ITM with eSure™ Technology
Installation Manual, Section 6040 (Issue AB, April 8, 2013)
Spec. No: 582145500
68
Section 6040
Model: NetSure™ ITM Issue AB, April 8, 2013
Fan Fault Protection: An alarm will be generated upon a fan fault. In such cases, the fault
indicator (red) on the PCU front panel will flash and the PCU will also inhibit its output. Auto-
recovery is enabled upon the clearing of the corresponding fault.
PFC Over/Under Voltage: The PCU will shut down when its bus voltage is higher than the over
voltage set point or is lower than the under voltage set point. During such conditions, the PCU does
not output any power and its protection indicator (yellow) will light up.
Active Load Sharing (PCU): The PCU uses advanced digital active load sharing technology that
maintains balancing to within ±3A. The difference in the average current between PCUs is <±3A for
loads in the 10 to 100% range. The Controller also has a PCU Load Sharing function.
Startup Time: The PCU has two startup modes:
a. Normal Soft Start Time: The duration from the time when the PCU is powered on to the
time when the PCU provides output voltage is <8s.
b. Current Walk-In: The rise time of the PCU output voltage is >8s at 90% of the rated load,
and the maximum time is 90s at 100% of the rated load.
Hot Swappable: The PCU is designed to be plug-and-play. The PCU can be inserted or removed
from a live DC power system with no damage. When the PCU is plugged into the system, the system
output voltage will not be affected.
Cooling: Each PCU contains a fan for forced convection cooling.
Fan Control: When the PFC bus voltage is within a normal range, the built-in processor adjusts the
fan’s speed according to the PCU’s internal temperature and output current. For example, a higher
temperature or output current will increase the fan speed. Above 45°C at full load, the fan operates at
full speed. When the PFC bus voltage is abnormal, such as very low bus voltage, the fan turns off.
Communication Failure: The PCU’s protection indicator (yellow) will flash should it experience a
communication failure. The failure information will be reported to the Controller and the Controller
will process the failure accordingly. During a communication failure, in order to protect the battery,
the PCU output voltage will automatically adjust to 53.5 V (this is a default value which can be
modified using the Controller). The PCU will revert to normal operation once normal communication
is restored.
Unbalance of PCU Output Current: When the output current of the PCUs in a DC power system
is unbalanced, the PCU having the unbalanced output current will be identified automatically and its
protection indicator (yellow) will turn on.
The failure information will be reported to the Controller and the Controller will process the failure
accordingly.
Local Status and Alarm Indicators:
a. Power (Green)
b. Protection (Yellow)
c. Alarm (Red)
d. A 10-segment Green LED is located on the front panel to represent output current, each
segment represents 10A.