A battery constant on an uninterruptible power system (UPS) gives users the status of the life expectancy of the battery. When the battery life is already “exhausted“ or has reached the end of its serviceable life, the battery constant is overwritten. Due to this, it will be necessary to replace the battery. Once the battery is replaced, it is important to do a self-test to reset the battery constant to the standard setting.
But, there are instances when the battery constant is not reset properly. In this situation, a manual reset should be performed. To perform a manual reset, all loads connected to the UPS should be disconnected and the UPS turned off, with its power cord removed from the main power source. The UPS is then turned on again and connected to a PC capable of running a Hyper Terminal session. Do a battery constant check before the Hyper Terminal session is started. To check for a connection, press “Shift + Y” to get an “SM” value.
Do not to type in any other characters to prevent irreparable damage on the UPS. Once the SM value comes out, type the number “1” once and after two to three seconds, type “1” again. After this is done, the “PROG” indicator will come out allowing the battery constant to be changed. But, it is important to remove the network management card to make sure the monitor will show the “PROG” indicator.
To ensure the correct battery constant is encoded, get the white barcode sticker at the back of the UPS and get in touch with the manufacturer to verify the battery constant. Resetting the battery constant may also be necessary when the replacement battery does not provide an accurate runtime or does not last as long as it should whenever a power outage is experienced.