System Troubleshooting - ABB MINI-MAG 10D1475 Series Instruction Manual

10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION MANUAL
Operation and maintenance procedures for the 10D1475
signal converters are provided in the Instruction Manual supplied with
When communicating in regard to replacement of a complete meter (with integrally mounted con-
verter), 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 manual.
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 converter which is supplied with the Series 1475 meter is an integrally or remotely
mounted microprocessor-based 50XM1000 signal converter.
Since signal wiring and operating procedures are dependent upon the mounting option selected, the
user should refer to the instruction manual supplied with the 50XM1000 signal converter 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