Esco Ascent max, User And Service Manual

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Press DOWN button until you find below message:
‐ ADC A/F : Show actual ADC value from airflow velocity sensor.
‐ ADC ZERO : ADC value from airflow velocity sensor when air velocity is zero (set
during zero calibration)
‐ ADC MIN :ADC value from airflow velocity sensor at airflow failure point (set during
sensor calibration).
‐ ADC MAX : ADC value from airflow velocity sensor at airflow maximum point (set
during sensor calibration).
‐ ADCTEMP : ADC value from temperature sensor.
‐ TEMP : this is the current ambient temperature read by temperature sensor (in ºC)
‐ CONSTANT : this is the airflow sensor constant
‐ CHM SNSR : ADC value from chemical sensor.
•
In order to prevent any AIRFAIL or unstable velocity displayed on LCD problem,
please ensure the followings after the calibration done:
1. CONSTANT value is correct. Check it with constant written on sensor body or
inside Replaceable Component Record List which come with test report.
2. TEMP shows room temperature. If not, refer to nextpossible cause,part B.
3. ADC ZERO < ADC MIN < ADC MAX. If not please re ‐ do calibration in correct
sequence: SET CONSTANT → SET ZERO → CALIB. If CALIBRATION ERROR is
encountered, please refer to next possible cause, part A.
4. Just after calibration, ADC A/F value should be somewhere between ADC MIN
and ADC MAX. If not, please adjust the speed controller or redo calibration as
necessary.
Sensor Failure /
Sensor
Misalignment
A. Air Flow Sensor failure / misalignment
•
Airflow sensor is located inside the unit and can be accessed from the back. See
figure 3 ‐ 2 below. It is a stainless steel tube with 2 round holes facing up.
Important to check:
1. Ensure that the sensor area is not blocked at all and that its through ‐ holes are
perpendicular to the filter’s surface.
2. Exhaust sensor is attached tightly to the mounting plate.
3. There is no gap between sensor box and filter surface.
4. Sensor box is installed tightly to the cabinet.
•
Turn off the cabinet.
•
See Component Layout to locate the main board.
•
Using DVM, check the sensor’s output voltage (DC) at channel AIN1(+) and J1( ‐ ) on
main board (See drawing 3 ‐ 3 below).
•
The voltage should increase if motor voltage is increased and decrease if motor
voltage is decreased.
•
If your observation is different, check sensor connection on the unit (see figure 3 ‐ 6
below) and at connector D pin 9,10,11,12 on electrical box (see Layout at the end of
this section) for any bad/loose connection.
•
If connection is okay but sensor is still not working properly, replace it.
•
If airflow sensor is working properly, proceed to next step.
B. Temperature Sensor Failure
•
Temperature sensor is located close to airflow sensor inside the unit. See figure 3 ‐ 2.
•
Using DVM, check the temperature sensor’s output voltage (DC) at channel AIN4( ‐ )
and J4(+) on main board (See figure 3 ‐ 3 below).
•
0.01VDC should represent one degree Celsius. For example, if output is 0.25VDC, it
indicates temperature of 25
o
C. Tolerance of ±1
o
C is acceptable.
•
Replace temperature sensor if the reading is wrong.
•
If temperature sensor is working properly, proceed to next step.