Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 223
0810-074
Figure 127 Backup Battery
3. Disconnect the two power connectors from the battery.
4. The battery can now be withdrawn carefully.
CAUTION
Do not short circuit the battery.
NOTE
A valve-regulated battery is used for the battery backup. According to
the ISO 14001 standard, the battery must be recycled.
5. Push the replacement battery back to its place and reconnect the
power connectors. Watch the right polarity!
6. Attach the cover plate by tightening the four screws holding it.
7. Turn on the AC power switch and the battery backup switch.
8. Close the interface unit and mount the upper interface unit cover
after exchange work is finalized.
Replacing PWD Sensor
The PWD sensor is mounted to the support arm of the LT31 transmitter
unit.
To replace the PWD sensor, the AC power has to be switched off first.
1. Remove the upper interface unit enclosure and open the interface
unit of the LT31 transmitter unit with the provided key.
NOTE
Switch the AC switch to off before proceeding with the next steps. In
case of the optional LTBB111, switch the battery backup switch to off
as well. See Figure 40 on page 83.
2. Disconnect the PWD cable plug.
3. Loosen the PWD attachment screw and remove the faulty PWD
sensor.
4. Install the PWD spare unit using the attachment screws and
washers.
5. Connect the cable plug to PWD. Make sure that the plug is
carefully and completely screwed on the PWD receptacle. See
Figure 80 on page 119.
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