122770 06 18-09-2007 29
Supply for fan Check the voltage on the fan connector on
Power PCB:
On PCB with date older than 2004 (see
copper print)
ATC-155/156/157: CN7
ATC-320/650: CN6
On PCB with date from 2004 and newer
(see copper print on PCB e.g. 040422)
ATC-125/140/155/156/157: CN10
ATC-250/320/650: CN10
Note
: The fan can run in up to 3 modes:
Idle mode, when the well is heating. U
min
=
7,0V
Medium speed . U
min
= 16,5V (ATC-156/157
only) (17,5V (ATC-125)).
Full speed when the calibrator is cooling
down. U
min
= 21,8V) (24V (ATC-125)).
• If supply voltages are above the minimum
limits, replace fan.
• If supply voltages are lower than the limits
replace and adjust Power PCB.
Error: The READ temperature in the display is
displayed as -.--°
Error message:
-
Likely cause: Solution:
The measured
temperature is out of
range
Check the ribbon cable connection between
Input PCB and Main PCB.
Check RTD sensor.
Disconnect the sensor from the Input PCB.
At 23°C in the well the impedance should
be 109 Ω ±3 Ω.
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