Reference Manual
00809-0100-4799, Rev BA
September 2002
Model 3244MV
4-3
Maintenance
The Model 3244MV transmitter has no moving parts and requires a minimum
amount of scheduled maintenance. The transmitter features a modular design
for easy maintenance. If a malfunction is suspected, check for an external
cause before performing the diagnostics presented below.
Sensor Checkout
If the sensor is installed in a high-voltage environment and a fault condition or
installation error occurs, the sensor leads and transmitter terminals could
carry lethal voltages.
To determine whether the sensor is causing the malfunction, either replace it
with another Rosemount sensor or connect a test sensor locally at the
transmitter. This can be very useful, especially when checking the wiring for a
remote mounted sensor. Please consult a Rosemount representative for more
information.
ELECTRONICS
HOUSING
Disassembly
The transmitter is designed with a dual-compartment housing; one
compartment contains the Profibus-PA electronics module assembly and the
other contains all sensor, power/communication, and internal ground lug
terminals.
The transmitter’s electronics module assembly is located in the compartment
opposite the terminal block.
Removing the Profibus-PA Electronics Module Assembly
Use the following procedure to remove the Profibus-PA electronics
module assembly:
NOTE
Part of the electronics are sealed in a moisture-proof plastic enclosure
referred to as the electronics module. The module is a non-repairable unit; if a
malfunction occurs the entire unit must be replaced.
1.
Disconnect the power to the transmitter.
2.
Remove the cover from the electronics side of the transmitter
housing. Do not remove any covers in explosive atmospheres when
the circuit is live.
3.
Loosen the two screws that anchor the electronics module assembly
to the transmitter housing.
4.
Firmly grasp the screws and assembly and pull it straight out of the
housing, taking care not to damage the interconnecting pins.
NOTE
Note the transmitter’s security switch position (ON or OFF). If the electronics
module is being replaced with a new one, ensure the security switch is set in
the same position (see “Security” on page 2-10).
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