provided. This port shall allow the system parameters, status, alarm
indication and control panel functions specified to be remotely monitored
and controlled.
2.12
TEMPERATURE CONTROL
2.12.1
General
Cabinet and enclosure ventilation shall be adequate to ensure that
components are operated within their ratings. Forced-air cooled rectifier,
inverter, and control unit will be acceptable. The cooling fans shall
continue operation if UPS input power is lost. Redundancy shall be
provided so that failure of one fan or associated circuit breaker will not
cause an overheat condition. Cooling air shall enter the lower front of
the cabinets and exhaust at the top. Blower power failure shall be
indicated as a visual and audible alarm on the control panel. Air inlets
shall have filters that can be replaced without opening the cabinet doors.
2.12.2
Blower Power Source
Blower power source shall be internally derived from the input and output
sides of UPS module, with automatic transfer arrangement.
2.12.3
Temperature Sensors
Temperature sensors shall be provided to monitor the air temperature.
Separate sensors shall monitor the temperature of rectifier and inverter
heat sinks. Separate sensors shall also monitor the transformer
temperature. Critical equipment overtemperature indication shall start a
timer that shall shut down the UPS system if the temperature does not
return below the setpoint level in [_____] minutes.
2.13
BATTERY SYSTEM
**************************************************************************
NOTE: Valve-regulated (sealed) batteries are
typically used for UPS systems up to 200 kVA.
Wet-cell batteries are typically used for UPS
systems of 80 kVA and above. Make choices as
required. Delete module references if not required.
a. Table 1, developed from information in IEEE 446,
lists the characteristics of each battery type.
Lead-calcium batteries require considerable time to
return to full equal charge on all cells following
discharge. For this reason, other battery types may
be required where frequent and prolonged outages
occur.
TABLE 1
Battery Type
Characteristics
Lead-Antimony*
14-25 year life on float
charge. Capacity decreases
with decrease in temperature.
Requires periodic (at least
twice/year) equalizing charge.
SECTION 16265A
Page 33
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