You need to fit an SNMP card into the card slot in the UPS.
This will enable you to monitor the UPS over a local network.
Instructions on how to set this up is all in the SNMP card manual.
The alarms that you can monitor from the UPS differ with the make and model of UPS.
The most common alarms are: Mains OK, Battery Low and Inverter OK.
Other alarms that are available from UPS alarm cards are as follows: Mains Fail, Bypass Active, Battery OK, UPS OK and UPS Fault, some alarm cards even come complete with a UPS Shutdown facility.
Most UPS’s have an external slot where you fit the alarm card into.
The alarms are Volt Free Contacts (VFC) or Dry Contacts, which open or close upon fault depending on the make and model of UPS.
Some more modern makes of UPS come complete with alarms as standard.
This function is only found on the Online UPS’s.
So you can feed in for example 50Hz and get out 60Hz.
Most UPS’s follow the frequency of the supply.
Most online UPS’s can be configured, either by the front panel or by software interface so that you can get a different output frequency than that of the supply.
If your UPS is set up as a frequency converter you lose the function of the static bypass facility and upon a fault occurring the UPS will shut down and drop the load.
This is because there would be a clash of frequencies.
Most UPS’s can be configured either by the front panel or by software interface to supply a different voltage that what the UPS default output voltage has been set to.
This is usually around ±10-15V depending on the style of UPS.
Therefore if you have a UPS that has a default output voltage of 230VAC then you will probably be able to change it to either 220VAC or 240VAC.
Harland Simon UPS recommends that if a system is not to be put into immediate service then the batteries within the system are charged within 6 months.
If batteries are left uncharged then they begin to self discharge themselves.
Therefore after about 10-12 months the batteries if left uncharged will probably be unserviceable.
A UPS can be powered up and with the inverter left switched off.
The rectifier will then maintain batteries until the system is ready for full service.
You can also order UPS’s with no batteries and order the batteries at a later date which can save money if the system is not to be put in to immediate service.
Harland Simon UPS recommends that the batteries in larger systems are checked once annually by having a preventative maintenance visit.