ABB CK-MAG 10D1477 Instruction Manual page 45

Magnetic flowmeter

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10D1477 MAGNETIC FLOWMETER INSTRUCTION MANUAL

6.2 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 primary meter or the signal

converter. A standard multimeter and an oscilloscope are suitable for making the test measurements.

To supplement the following discussion refer to:

Section 5.0 Circuit Description

Figure 5-1 Primary Wiring With Remote Converter

Signal converter assembly ... refer to the 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.

If meter operation is suspect, proceed as outlined below.

1. Remove access covers from customer junction box and electronics compartment of

primary. Remove access cover from remote signal converter housing, if applicable.

Inspect for evidence of condensate in junction box. If condensate is present, de-ener-

gize system power source. Conduit seals must be used at cable entrances to prevent

entry of condensate. Allow interior of junction box to dry completely before restoring

system power.

2. Since signal wiring and operating procedures are dependent upon the mounting

option selected, the user should refer to the instruction manual supplied with the

associated signal converter for system troubleshooting procedures. A static perform-

ance test for the primary mounted components is discussed in Section 6.3.

The magnetic flowmeter is supplied with a remotely mounted microprocessor-based

converter

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

6-2

WARNING

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