morse AHT 20 Manuel D'instructions page 19

5.14 DMC14 ELECTRONIC INSTRUMENT (AIR DRYER CONTROLLER)
set
DISPLAY
Through the digital thermometer with an alphanumerical display, the DMC14 controller shows the DewPoint
detected by the probe in the evaporator.
The LED shows any alarm condition, it can happen when :
- pressure DewPoint is too high;
- pressure DewPoint is too low;
- the probe is faulty.
If the probe is faulty, the instrument also shows "PF" message (Probe Failure), and alarm activation is immediate. In
case of "DewPoint too low" condition (ASL parameter, that is fix and equal to 28.5° F or -2° C), the alarm signal is
delayed of a fix time (AdL parameter) equal to 30 sec, while for "DewPoint too high" condition the value (ASH
parameter) is set by the user and the signal is activated with AdH delay time, that can be also set up by the operator
(the instrument is already adjusted during final test of the dryer, please see following values). When DewPoint
returns into operating temperature (set range), the alarm condition is deactivated.
DMC14 allows also remote annunciation of the alarm condition of the dryer; this through a volt free contact on
terminals 8 & 9 - please also see electric drawings into the attachments (max 250V 1A, min 5VDC 10mA)
- with dryer off or in alarm conditions contact is open
- with dryer on and correct operating DewPoint, contact is closed.
OPERATION - After dryer starting, the electronic controller displays current operating DewPoint : it shows
the measured temperature in Celsius degrees ( ● °C) with a 0.5°C resolution, or in Fahrenheit degrees ( ●
°F) with a 1°F resolution.
SET-UP (PROGRAMMING)
To access the set-up, keep pressed simultaneously both
this way programming operation will be activated and the controller display shows the first parameter
that can be set (Ton). After that, by pressing
If the value is correct press
change the value of selected parameter, must be used
increase the value. All parameters that can be modified are indicated in following table :
Display
Ton Not used
ToF Not used
ASH Alarm threshold for a high DewPoint .
AdH ASH alarm time before signal
SCL Temperature scale
Fixed parameters :
It is possibile to exit from set-up conditon in any moment, by pressing simultaneously both
If any operations are not made during 30 seconds, the controller exits automatically from programming operation.
set
DMC 14
esc
°C
°F
esc
●
●
●
set
set
button to conferm it and to give access on following parameters. To
Description
ASL (low DewPoint alarm) = -2° C or 28.5° F
Button - access the set-up.
Button - Exit programming / decrease value.
Button - Value increment.
LED - Dryer in alarm status.
°C LED - Display the set temperature scale (°C).
°F LED - Display the set temperature scale (°F).
LED - Not used
set
and
buttom the display shows the value set for that parameter.
esc
and
button for at least 5 seconds. In
button, respectively to decrease or
Value range Set value Equal to
01 ... 20 02
01 ... 20 01
0.0 ... 68.0 60
00 ... 20 20
°C ... °F °F
AdL (signal delay) = 30 sec
esc
and
GB
2 sec
1 min
60°F
20 min
°
Fahrenheit
button.