ML0030 August 2009 Copyright 2009 Bitronics, LLC
−
14
−
4.5 Electronics Module Removal
The Electronics Module consists of the Analog Processing Board (AP), the Microcontroller
Board (MCU) and LED Display Board (LED). In the unlikely event of a board failure, it may
be necessary to remove the Electronics Module from the instrument. Bitronics has
designed the WATT/VAR meters in a modular fashion to facilitate this repair in the field, by
allowing the module to be removed with the meter powered and in the panel. The
procedure is as follows:
1. Remove the four screws holding the front panel to the meter, and remove the
front panel and gasket.
2. Remove the two roundhead screws located at 3 o'clock and at 9 o'clock (labeled
"REMOVE").
3. A wire bail is located at the top of the module, pull gently on the bail, and the
Electronics Module will pull out ( a slight rocking motion may be required ). Be
careful not to bend any of the connector pins in the Base Module. CAUTION - when
the Electronics Module is removed with the instrument powered, instrument power
(115Vac or 230Vac) is present on the circuit boards that remain in the Base Module.
DO NOT touch or insert metallic objects into the Base Module while the instrument
is powered.
4. To reinsert the Electronics Module, align the two 0.25" round guide rails with the
two holes in the bottom board of the Electronics Module. Gently push the
Electronics Module in until the module is fully seated (DO NOT FORCE!!).
5. Replace the two roundhead screws located at 3 o'clock and at 9 o'clock. Push
the wire bail back into the meter.
6. Check CT and PT ratios and reset if necessary (See section 4.1 Rescaling).
7. Replace the gasket, front cover and four cover screws.
