Honeywell WEB/CP-202-XPR Installation Instructions Manual page 24

WEB/CP-202-XPR AND WEB/CP-602-XPR CONTROLLERS
Apply Power
The WEB/CP-202-XPR and WEB/CP-602-XPR controllers do not include an on/off switch. To apply power, you simply energize
the 24 Vac transformer (or 24 Vdc power supply) wired to the 3-position power input terminals. If remote I/O modules are wired to
the unit, they are also typically powered by the controller as well.
Check the Status LEDs
When power is applied, the (top) green LED STATUS will light. This indicates that the system is OK and that power is applied.
Once the controller boots, the yellow BEAT (heartbeat) LED under it will begin a steady blink, with a typical rate of about 1 Hz.
Blinking should begin within 30 seconds after power is applied.
If after applying power, the STATUS LED goes out, or if the yellow BEAT LED comes on (steady) and stays lit longer than two
minutes, contact Systems Engineering for technical assistance. Also see About LEDs on page 25.
About the Backup Batteries
The WEB/CP-202-XPR and WEB/CP-602-XPR controllers can have two different backup batteries:
• The standard on-board NiMH battery pack, and
• An optional external, sealed lead-acid, rechargeable Backup Battery (or batteries)
For continuous system operation during loss of primary AC power, unless power loss is only a few seconds, both batteries should
be installed. Station alarms are generated if either battery is uncharged or unable to hold a sufficient charge, as well as whenever
primary power is lost. You should always investigate any alarm related to backup batteries.
NiMH battery pack
NOTE: See NiMH Battery Precautions on page 6.
A custom 10-cell NiMH (nickel metal hydride) battery pack is mounted inside the controller, under the cover atop a metal shield
plate (see Fig. 1 on page 2). This battery allows the controller to continue station operation (only) through very short power
bumps, meaning a few seconds in duration. If a longer outage occurs, the NiMH battery provides enough run time for the unit to
backup data and then shutdown. Typically, this process takes about one minute. Shutdown occurs automatically, after data is
backed up to on-board flash memory.
Upon startup (boot), a test of the NiMH battery is performed. A system alarm is generated if the NiMH battery voltage level is
found to be bad. A charge is also initiated upon startup, which lasts from 3 hours minimum, and can range up to 18 hours if the
battery is completely discharged.
During this NiMH battery charge period, neither the NiMH battery or the external Backup Battery (if installed) is tested. After the
startup NiMH charge period, a periodic test occurs of the NiMH battery and the external sealed lead acid backup battery. The
appropriate battery alarm is generated is either battery is found to be bad.
NOTES:
1. If the last NiMH battery test was "bad," upon loss of primary power, the controller performs an immediate shutdown,
backing up data and powering off (including expansion modules).
2. A NiMH battery characteristic is to lose charge if not left in charge mode (trickle charge). Leaving the battery uncon-
nected, or in the unit powered off will cause the battery to fully discharge in a matter of weeks. Note that in the case
of a new controller, the battery pack ships from the factory completely discharged. Therefore, allow at least 18 hours
for the battery to charge if it has not been in a powered unit.
Replace the NiMH battery pack approximately every three years, or more often if the unit is in a high temperature environment.
For more information on the use and replacement of the battery, refer to Required NiMH Battery Maintenance on page 27.
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