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8 Troubleshooting
Mycom S CPM 153
102
Hauser
8.2
Response of outputs to errors
8.2.1
Current output behaviour
If an error occurs in the system, an error current is output at the current output. You can
adjust the value of this error current in the Alarm menu (see page 43).
If you have configured the controller for functioning with a current output, no error cur-
rent is output on this current output should an error occur.
8.2.2
Response of contacts to errors
You can select the assignment of which instrument error messages trigger an alarm
individually for each error message (see table on page 93, editing errors on page 44).
In "NAMUR" mode, failure messages (E 001 – E 029) always trigger an alarm.
Behaviour with standard setting
Incorrect measured pH
/ mV value and / or
measured temperature
value
Transmitter module defective
(module: MKP2), please carry out
tests and measures first as descri-
bed in Chap. 8.1.2
Test measuring inputs:
Connect pH, Ref and PM directly on
the instrument with wire jumpers:
Display must be pH 7
Resistance 100
Ω
of
Terminals 11 to 12+ 13.
Display must be 0°C
If test negative: Replace module
MKP2, performed using installation
diagram page 105
Current output,
Current value incorrect
Calibration incorrect
Test with integrated current simulation,
connect mA meter directly to current
output
If simulation value incorrect: new
module M3Cx-x
required.
If simulation value correct:
check current circuit for load and
shunts
Load too high
Shunt / short-circuit to frame in cur-
rent circuit
Incorrect operating mode
Check, whether 0–20 mA or 4–20 mA
is selected
No current output signal Current output stage defective
(Module: M3CH-x)
Test with integrated current simulation,
connect mA meter directly to current
output
If test negative:
Replace module M3CH-x
(Check variants, see spare parts list
in Chap. 8.3)
Instrument with PROFIBUS
®
interface
PROFIBUS
®
instruments do not have a
current output
For information, see "DIAG" / internal
data
Error
Possible cause
Tests and / or remedial
action
Equipment, spare parts,
personnel
Instrument status
Alarm relay
Limit value / Controller
Normal operation
picked-up (Fail-safe behaviour)
Appropriate
configuration and
operating status
Alarm
Dropped out
Voltage-free
Dropped out
Dropped out