Küppersbusch EDG 6600.0, Руководство по обслуживанию

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86 H3-72-01
For internal use only
10. Wrong behaviour
10.0.1 Oven temperature sensor PT 500
The oven temperature recording is monitored for short circuits and interruptions in the sensor and in the
reference resistance. In the case of a malfunction, an error is indicated.
Fault mechanisms
A meter is incremented every 200
μ
s in order to calculate the discharge time.
If the time for discharging the reference resistance is lower than 400* 200
μ
s (metre reading
≤
400 is an
indication of a resistance short circuit) or if it is higher than 1500* 200
μ
s (metre reading
≥
1500 means
a resistance interruption), the error message F0 will be indicated on the display.
If the time for discharging the Pr500 resistance is lower than 150* 200
μ
s (metre reading
≤
150 is an
indication of a resistance short circuit) or if it is higher than 1500* 200
μ
s (metre reading
≥
1500 means
a resistance interruption), the error message F0 will be indicated on the display.
In the event of a fault, the appliance control system switches off all of the actuators and switches over to
fault mode. It is not possible to start up a program until the fault has been rectified.
Please note! The stability of the PT 500 characteristic is guaranteed by the manufacturer within
the tolerance levels and is not monitored by the software.
Possible causes of faults
• PT500 or reference resistance defect (short circuit, interruption)
• Discharge capacitor defect (short circuit, discontinuity)
• Wiring defect (plug connections, cable discontinuity, cable short circuit).
• Wiring on the control device defect (filter capacitor defect, strip conductors excessively resistant).
Oven temperature PT 500
RESISTANCE DEPENDING ON THE
TEMPERATURE
Temperature (°C) Resistance (
Ω
)
0 500
20 539.7
40 579.2
100 696.15
200 886.4
250 979.35
280 1034.45
500 1422.45