System Troubleshooting - ABB MINI-MAG 10D1475 Instruction Manual

10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION BULLETIN
Operation and maintenance procedures for the 10D1475H & 10D1475J
Signal Converters are provided in the Instruction Bulletin supplied with
When communicating with Bailey-Fischer & Porter in regard to replacement of a complete meter (with
integrally mounted Converter), the meter body, or the Signal Converter, it is important to refer to the
complete instrument serial number to assure that the correct replacement will be supplied. The
subject information is provided on the manufacturing specification sheet supplied with the Magnetic
Flowmeter, and on the instrument data tags.

5.2 System Troubleshooting

In the event faulty operation of the Magnetic Flowmeter is evident, the following procedure can be
used as a guide to isolate the malfunctioning device to either the Flowmeter or the Signal Converter.
A standard multimeter and an oscilloscope are suitable for making the test measurements.
To supplement the following discussion refer to the applicable Signal Converter Instruction Bulletin.
Equipment powered by an AC line voltage presents a potential electric
shock hazard. Servicing of the Magnetic Flowmeter or Signal Converter
should only be attempted by a qualified electronics technician.
1. If improper meter operation is suspected, proceed as follows:
a) Remove access covers from the junction box and the Converter housing (remote or
integral).
b) Inspect for evidence of water entry in junction box and Converter housing.
If water entry is present, de-energize system at power source. Inspect conduit seals and cover
gaskets for possible source of water entry. Replace the seals and/or gaskets if evidence of water
entry is indicated. Allow interior of junction box and Converter housing to dry completely before
restoring system power.
2. The Signal Converters which may be supplied with the Series 1475 meters are:
• Integrally or remotely mounted Microprocessor-Based Model M2 Signal Converter
• Remotely mounted Microprocessor-Based Model 50XM1000N Signal Converter
Since signal wiring and operating procedures are dependent upon the type of Converter and the
mounting option selected, the user should refer to the Instruction Bulletin supplied with the M2 or
50XM1000N Signal Converters for system troubleshooting procedures. A static performance test for
the flowmeter mounted components is discussed in Section 5.3.
3. Possible causes of erroneous flow rate indication are:
• incorrect grounding
• excessive noise due to a heavy slurry process
or a non-homogeneous process
• loose or intermittent wiring
• non-full or empty meter pipe
• excess air entrained in process liquid
5-2
NOTE
the Signal Converter.
WARNING
MAINTENANCE