6 Removal and Replacement
6.13 48 V Backup Battery Replacement
428 HPM High-Performance Process Manager Service R688
Honeywell December 2020
End of Battery Pack life check
The battery pack can be checked for the end of its life by using the procedure in the following table.
Set the BATTERY switch on the power system control panel in the OFF position.
Remove the Power System’s lower cover. You can use either a screwdriver or a coin to
remove the two screws holding it in place.
Release the Power System cord connector at the battery.
Disconnect the battery pack from the subsystem.
Attach two pairs of leads to the battery pack terminals. One pair of leads are for
attaching a load resistor and must be a minimum of
1.0 mm
2
(18 AWG) wire. The second pair is for attaching a voltmeter and can be a
smaller gauge.
Select a voltmeter range of 60 Vdc for monitoring the battery voltage. Attach the
voltmeter to the smaller gauge leads.
The battery load for the test must be 5 ohms and rated at 500 watts. Five 1-ohm, 100-
watt resistors placed in series is recommended.
Attach the resistors to the larger test leads. Note the time of attachment.
The battery voltage must remain above 40 Vdc for a minimum of 20 minutes. If the
battery voltage is not maintained, the battery is considered at the end of its life and
must be replaced.
All batteries of the same capacity, rating, and specifications, do not provide equivalent
performance or reliability. For optimum battery backup performance, use only
Honeywell recommended and approved batteries.
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