MPS Doc: M359_USER_MANUAL REV G January 17, 2010 Page 22 of 30
6.2.3. Charge-discharge Cycles
The number of times and the depth of battery discharges (during AC Input failure)
affects the service life of the battery. If the battery is allowed to discharge only to 50%
of its charge, the number of charge-discharge cycles (before it fails) will be three times
the number of cycles had it been allowed to reach 30% charge. Limiting the operating
time on battery power, to the minimum required by the system to perform an orderly
shutdown, will prolong Battery life.
6.3. Replacing the Battery Pack
The M359 uses a Plug-in, Hot-swap, Battery Pack (MPS P/N M359380) that may be ordered
separately.
Caution! The Battery Pack is an integral part of the M359 structure. Unless the
M359 is in storage, it should never be left for more than a few minutes without a
Battery Pack properly installed. Therefore, before removing the Battery Pack
from the M359, make sure that you have a replacement Battery Pack ready and
at hand.
To remove the Battery Pack (6) from the UPS:
1)
No need to turn off the UPS. However, before removing the Battery Pack verify
that the UPS is not operating on Battery power (the ON BATT yellow LED should
be off).
2)
Open the ten size 8-32 screws marked ‘A’ (12) on the Battery Pack front panel.
3)
Using the Battery Pack handle (11) pull out the Battery Pack and remove it
.
Caution!!
The Battery Pack is heavy (52 pounds), handle with care!!
To re-install the Battery Pack:
1)
Carefully and slowly
plug the Battery Pack straight into its place. Never slam it
in! Slamming the Battery may damage its I/O connector.
2)
When the Battery is all the way in, use the hardware kit that came with the Battery
Pack, to secure the Battery in place (insert each screw through a spring washer
then a flat washer and then through the Battery Pack’s panel). Tighten the screws
gradually, in diagonal pattern. (Use 22 2 Lb-Inch torque).
