kajaaniMCA
i
– Installation, Operating & Service - 10.2 - W4610201 V2.5 EN
F7
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F8
F3
F1
F2
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F15 F16
i
Fig. 10.3. “Diagnostics limits” display.
Error functions of the selfdiagnostics
Error limit current alarm
output relay
Meas level 10 u Yes Yes
low
Meas level 100 u Yes Yes
high
Ref level 500 mV Yes Yes
low
Unstable 50 us Yes Yes
meas. sig
Unstable 10 us Yes Yes
ref. sig
Temperature Yes Yes
Default Change Save
values
10.C. Simulation Cable Test
Go from M
AIN MENU => SELFDIAGNOSTICS => SETTINGS
=> SIMUL. CABLE (Fig. 10.2).
The simulation cable test can be used to check for
possibly faulty sensor electronics; this may be neces-
sary if the signal level from the measurement level is
low while the reference channel is OK. In the test, the
measurement from the process is replaced by a simula-
tion cable and a microwave attenuator of a known
rating. Proceed as follows:
1. Disconnect the antenna cables as instructed in sec-
tion 11.C.2.
2. Connect the simulation cable and microwave atten-
uator to the antenna connectors on the Microwave
Module.
3. Go to S
ELFDIAGNOSTICS => SETTINGS => SIMUL. CABLE
and press [F1&F2] MEASURE. The MCAi sensor will
measure the attenuation of the microwave attenuator
in dB. The measured attenuation must not differ
more than ±5 dB from the true attenuation of the
device. E.g. if the attenuator rating is 60dB, the
measured result must be in the range 55–65 dB.
If the measurement result is in the acceptable range,
the signal level deviation is caused either by the pro-
cess, antennas, or antenna cables (see section 11).
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F1
F2
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F15 F16
i
SIMULATION CABLE
Connect simulation cable and press
“Measure”.
Attenuation of the simulation-cable =
53.3 dB
Measure
Fig. 10.2. “Simulation cable” display.
10.D. Error Limits
Go from M
AIN MENU => SELFDIAGNOSTICS => SETTINGS
=> DIAGN. LIMITS (Fig. 10.3).
Limits and functions for each error can be config-
ured on this page. Press [F1&F2] E
DIT to change the
limits. Also the current output and alarm relay functions
can be changed here (Y
ES/NO). Press [F3&F4] Default
values in the edit mode to apply the program defaults to
all settings.
When the values have been configured as required,
press [F7&F8] to save.
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