KIRLOSKAR CHILLERS PRIVATE LIMITED
A Kirloskar Group Company IOM-KAC-ENG - Page 54
On power-up various problems
occur on the LCD (strange
characters, blank display).
1. Correct software in the flash
2. The PLAN address on the PCO and the terminal
(compliant with the requirements of the application used);
3. The built-in display, is featured, is working correctly; the
problem lies in the connection between the PCO and the
PGD (display) terminal: make sure that the cable is plugged
in correctly.
Incorrect reading of the input
signals
1. The correct power supply to the PCO;
2. The correct power supply to the probes: if the voltage
(+Vdc>20V) is near zero, disconnect the probe and measure
the power supplied by the PCO. If this is still near zero, turn
the controller off and wait a few minutes. If the problem
persists, contact KCPL service; otherwise the connection
that was removed was short-circuiting the power supply.
3. The separation of the power supply to the digital inputs
from the power supply to the PCO. A 24 Vac/24 Vac
transformer with a proper rating can be used.
4. The probe wires are connected according to the wiring
diagram
5. There is not a high thermal resistance between the sensor
and any probe socket that may be used. If necessary, place
conductive paste or oil in the socket to ensure correct
transfer of the temperature;
6. If there is a probe error or a conversion error on the PCO,
the checks to be made depend on the type of probe.
Pressure probes: if errors occur in
the reading of these probes
1. The analogue inputs used for the probes are not connected
as per wiring diagram (in the application program);
2. The probe capillary is not blocked.
Temperature probes: if errors
occur in the reading of these
probes
1. The analogue inputs used for the probes are not connected
as per wiring diagram (in the application program);
2. The probe capillary is not blocked.
Doubtful alarm signal from
digital input
The voltage between the common terminal “IDC1” and the
terminal of the digital input indicating the alarm “IDn”, in
the following conditions:
1. If there is voltage (24 Vdc, depending on the power
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