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NetSure™ ITM with eSure™ Technology
Installation Manual, Section 6040 (Issue AB, April 8, 2013)
Spec. No: 582145500
67
Section 6040
Model: NetSure™ ITM Issue AB, April 8, 2013
7.5.11 Standard Features
Type of Power Conversion Circuit: High frequency.
Float Charging Output Mode: In this mode of operation, system output voltage is constant and
output current does not exceed the current limit setting. During normal operation, the battery is not
required to furnish load current and remains in a fully charged condition.
Float voltage is set via the Controller, default @ 54.5V for furnished batteries.
Input Protection:
a. Input Over/Under Voltage Protection: The PCU shuts down and its protection indicator
(yellow) illuminates when the input voltage is lower than 260VAC or higher than 530VAC.
This condition is reported to the power system Controller and the power system Controller
processes the alarms accordingly.
b. Input Fusing: Input fuse is provided in each PCU. This fuse is not customer replaceable.
Output Protection:
a. Current Limiting: The maximum current delivered by the system is programmed via the
Controller. The Controller automatically adjusts the current limit circuit on each PCU so that
this value is not exceeded. If a PCU fails, the Controller automatically resets each remaining
PCU's current limit point to maintain this value. The Controller also insures that the current
limit circuit on any PCU is not set above 110% of its capacity. The default current limit
setting is the sum of each installed PCU's output rating. If an additional PCU is added to the
system, the system current limit is automatically increased by the rating of the new PCU and
the new current limit value is displayed.
The current limiting point is set via the Controller.
b. Output Fusing: Output fuse is provided in each PCU. If a fuse opens, local and remote PCU
Fail Alarms activate. This fuse is not customer replaceable.
c. High Voltage Shutdown:
1. Internal: If PCU output voltage exceeds an adjustable preset value, the PCU shuts down.
•After approximately 5 seconds, the PCU automatically restarts. If PCU output voltage
again exceeds the high voltage shutdown value within 5 minutes, the PCU shuts down
and locks out. Manual restart is then required. If the PCU does not experience a high
voltage condition within the 5 minute time period, the restart circuit is reset.
•Only the PCU causing the high voltage condition shuts down.
•The high voltage shutdown point is set via the Controller.
2. Backup: If PCU output voltage exceeds a second (non-adjustable) value, the PCU shuts
down and locks out regardless of load. Manual restart is then required. The fixed
hardware HVSD is 59.5V (within the range of 58.5 to 60V).
High Temperature Protection:
a. When the PFC board temperature is higher than 85°C, the PCU turns off. When the PFC
board temperature is lower than 75°C, the PCU resumes normal operation, and the hysteresis
is at least 10°C.
b. When the difference between “ambient temperature" and "PFC board temperature” is greater
than 5°C, the PCU turns off. When the difference between “ambient temperature" and "PFC
board temperature” is less than 2°C, the PCU resumes normal operation, and the hysteresis is
at least 3°C.
c. When the DC board temperature is higher than 105°C, the PCU turns off. When the DC board
temperature is lower than 95°C, the PCU resumes to normal operation, and the hysteresis is
at least 10°C.
NOTE
If the current demanded by the load exceeds the current limit setting of the system, the battery is
required to furnish the difference in load current and begins discharging.