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7.4 Faults and symptoms during start-up and process flow measurement

Before contacting Krohne Service, please read through the

following tables. THANK YOU !

• Most faults and symptoms occuring with the flowmeters can be eliminated

with the aid of the following tables.

• For greater clarity, faults and symptoms in the tables are divided into 2 parts and

various groups.

• Part 1

Signal converter IFC 090 B (B = basic version), without display

and without HHT or CONFIG user program (see Sect. 6.2)

Groups: LED LED display (status messages)

I Current output

P Pulse output

LED / I / P LED display, current output and pulse output

• Part 2

Signal converter IFC 090 D (D = display version) and

Signal converter IFC 090 B (B = basic version), without display

but with CONFIG user program (see Sect. 6.2)

Groups: D Display

I Current output

P Pulse output

S Status indication output

C Control input

D / I / P / S LED display, current output, pulse output,

status output and display

Part 1 Converter IFC 090 B (B = basic version), without display

and without HHT or CONFIG operator program

Group LED Fault / Symptom Cause Remedial action

LED 1 LED flashes red/green Overranging of A/D converter,

Reduce flowrate; if unsuccessful,

current or pulse output test as described in Sect. 7.5.

Measuring tube drained, Fill measuring tube.

A/D converter overranged.

LED 2 LED flashes red Fatal Error, hardware and/or Replace signal converter

software error (see Sect. 8.7) or contact

Krohne Service.

LED 3 cyclic flashing of red LED, Hardware fault, Watchdog Replace signal converter

approx 1 second activated. (see Sect. 8.7) or contact

Krohne Service.

LED 4 LED shows red continuously Hardware fault Replace signal converter

(see Sect. 8.7) or contact

Krohne Service.

Group I

Fault / Symptom Cause Remedial action

I 1 Receiver instrument Connection/polarity incorrect. Connect properly as described

indicates “0”. in Sect. 2.3 + 2.7

Receiver instrument Check connecting cables and

defective. receiver instrument, and

replace if necessary.

Short between current output Check connections and

and pulse output cables, see Sect. 2.3 + 2.7,

voltage between I

and

I⊥ approx. 15 V. Switch off

device, eliminate short-circuit,

switch device on.

Current output defective Replace signal converter

(see Sect. 8.7) or contact

Krohne Service.

I 2 22 mA present at current Current output I overranged Check device parameters

output (fault current) and change if necessary,

see Sect. 6.2, or contact

Krohne Service

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 78 79

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