Emerson Process Management ControlWave EFM 3808 - Manual (Page 117)

CI-ControlWave EFM Service / 3-1
Section 3
SERVICE
3.1 SERVICE INTRODUCTION
This section provides general, diagnostic and test information for the ControlWave EFM.
The service procedures described herein will require the following equipment:
1. PC with null modem interface cable & Bristol’s WINDIAG Software
2. Loop-back plug, 9-pin female D-Sub (for RS-232) (see Figure 3-9)
3. Loop-back plug, 9-pin female D-Sub (for RS-485) (see Figure 3-10)
The following test equipment can be used to test the Power Supply/Sequencer Module:
1. DMM (Digital Multimeter): 5-1/2 digit resolution
2. Variable DC Supply: Variable to 30Vdc @ 2.5A (with vernier adjustment)
When ControlWave EFM electronic flow meters are serviced on site, it is recommended
that any associated processes be closed down or placed under manual control. This
precaution will prevent any processes from accidentally running out of control when tests
are conducted.
Warning
Harmful electrical potentials may still be present at the field wiring terminals
even though the ControlWave EFM’s power source may be turned off or
disconnected. Do not attempt to unplug termination connectors or perform any
wiring operations until all the associated supply sources are turned off and/or
disconnected.
Warning
Always turn off the any external supply sources used for externally powered
I/O circuits, before changing any modules.
3.2 COMPONENT REMOVAL/REPLACEMENT PROCEDURES
This section provides information on accessing ControlWave EFM modules for testing, as
well as removal/replacement procedures.
3.2.1 Accessing Modules For Testing
Testing and replacement of ControlWave EFM modules should only be per-formed by
technically qualified persons. Familiarity with the disassembly and test procedures
described in this manual are required before starting. Any damage to the ControlWave
EFM resulting from improper handling or incorrect service procedures will not be covered
under the product warranty agreement. If these procedures cannot be performed properly,
the unit should be returned to Bristol (with prior authorization from Bristol Inc.) for factory
evaluation and repairs.