FX70 Supervisory Controller Installation Instructions
18
Required NiMH Battery Maintenance
Battery life expectancy is a function of its discharge
cycles (the number of discharges and their depth) and
the ambient temperature of the battery during normal
operation. In most applications, the NiMH battery
should see relatively few discharges. Therefore,
ambient temperature has more to do with the life
expectancy of the battery than does any other factor. If
the controller is installed in a conditioned space, this
battery should provide dependable service for
approximately 3 years (average). In an environment
where the operating temperature is higher (that is,
50°C or 122°F), you should only expect the battery to
last approximately 1 year.
The NiMH battery in the controller is fully discharged
when factory shipped. Additionally, NiMH batteries lose
charge over time if not kept trickle-charged (for more
details, see
on page 16). Therefore,
even a new unit (or replacement battery) requires up to
18 hours of powered operation before it can provide
reliable backup power (is at full charge).
The controller monitors the NiMH battery and
periodically loads the battery to test its ability to
maintain battery-backed functions. Investigate any
battery trouble message, and check the battery
connections to the unit. Replace the battery as
required. To order a new battery, see
on page 19. See
on page 18 for a replacement procedure.
Replacing the NiMH Battery
The replacement NiMH battery is an assembly that is a
custom battery pack with an attached cable and
connector plug (see Figure 11). To replace the battery,
you must remove power to the unit and remove its
cover.
1.
Back up the controller’s configuration to your
computer using FX Workbench.
2.
Remove all power from the controller, including any
sealed lead-acid battery. Wait for LED activity to
stop—after a couple of minutes, all LEDs on the
unit should be off.
3.
Remove the cover. See
At this point you have access to the NiMH battery
assembly (Figure 14).
4.
Unplug the NiMH battery from the main board
connector (see Figure 14).
5.
Use a 1/4 in. (6 mm) nutdriver to unfasten and
retain the two kep nuts that secure the metal
battery bracket to the shield, and remove the shield
and battery pack.
6.
Put the replacement battery into the metal shield,
and refasten back into place on the shield, using
the two kep nuts. Hand tighten with a nutdriver.
7.
Plug the battery connector plug of the replacement
battery into the NiMH battery connector on the
main board of the controller. The connector is
keyed; you cannot plug the battery in reversed
position.
8.
Replace the cover.
9.
Restore power to the controller and verify normal
operation.
Battery Disposal
Note:
Batteries removed from this device must be
recycled or disposed of in accordance with local,
national, and regional regulations. Only certified
technicians or qualified building maintenance
personnel should service Johnson Controls® products.
Repair Information
Servicing the FX70 may call for replacement parts.
There are three categories of parts.
IMPORTANT:
Use only NiMH battery packs
approved for use with the FX70 Supervisory
Controller.
IMPORTANT:
Do not incinerate or mutilate the
battery, as this may cause it to burst or release toxic
materials.
Cover Removed
Unplug/Plug NiMH
Battery from/to
Connector
NiMH Battery
Connector on
Controller Board
NiMH Battery Pack
LP-KITFX7BAT-0
.25 in. (6 mm)
Kep Nuts (2)
Fasten Battery
Bracket to Shield
Battery Bracket
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Figure 14: Replacing the FX70 NiMH Battery Pack
