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Users Manual & Installation Guide
PV- 5127: Power supply module with UPS
Page 7 of 31
The mains supply is continuously monitored. There is hysteresis on the mains monitor so that a
mains failure is reported when the mains voltage drops below 16.5V, and mains is reported OK
when the voltage rises above 17.5V.
The connected lead-acid backup battery is maintained by an integrated battery charger (fast charge
and trickle charge). Using an external battery temperature sensor, you can disable the charging if
the battery is too hot. See the section Battery monitor and charger.
The PV-5127 can also monitor the system (ambient) temperature and prevent the CPU from starting
if it is too cold or too hot, and advise it to shut down if it is too hot. The system temperature can
also be used to control an external fan and heating element. See the section System temperature.
UPS monitoring software on the CPU can get UPS status information through the RS232 port and
the PC/104 bus, and it can perform a software-controlled power-off through the ATX signal
PS_ON, the RS232 port, and the PC/104 bus. See the section UPS control.
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