Vaisala DRYCAP DMT143 Manual De Uso Y Mantenimiento página 8

DMC14 ELECTRONIC INSTRUMENT (AIR DRYER CONTROLLER)
set
The DMC14 controller performs a double function : it shows the current operating DewPoint temperature through the
alphanumeric display, that is measured by a probe located at the end of the evaporator; it also controls the functioning
of condensate drain solenoid valve through the cyclic electronic timer.
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 -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 this alarm condition of the dryer :
- with dryer off or in alarm conditions there is no voltage from terminal 4 and 9 of electronic instrument (please also
see electric drawings into the attachments);
- whereas, with dryer on and correct operating DewPoint, there is voltage from terminal 4 and 9 of electronic
instrument (please also see electric drawings into the attachments).
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.
The condensate drain solenoid valve is activated for 2 seconds (Ton) - LED (●
setting. To perform the manual test for the condensate drain, press the
SET-UP (PROGRAMMING)
To access the set-up, keep pressed simultaneously both
programming operation will be activated and the controller display shows the first parameter that can be set (Ton).
After that, by pressing
set
button to conferm it and to give access on following parameters. To change the value of selected parameter,
esc
must be used and
modified are indicated in following table :
Display
Ton Activation time of condensate solenoid valve
ToF Pause time of condensate solenoid valve
ASH "DewPoint too high" temperature alarm
AdH Delay time before ASH alarm activation
SCL Temperature scale
Fix parameter :
It is possibile to exit from set-up conditon in any moment, by pressing simultaneously both
any operations are not made during 30 seconds, the controller exits automatically from programming operation.
ALARM CONDITION-
The LED of the
instrument is on or
flashes to indicate
alarm situations.
DMC 14
°C
°F
esc
set
buttom the display shows the value set for that parameter. If the value is correct press
button, respectively to decrease or increase the value. All parameters that can be
Description
ASL ("DewPoint too low" alarm) = -2°C
The LED
The LED
The LED
instrument displays the message "PF" (Probe Failure) – replace the probe.
set
Button - access to set-up.
esc
Button - exit to set-up / value dencrement.
Button - condensate drain test / value increment.
LED - dryer in alarm condition.
● °C
LED - it shows the current temperature scale (°C).
● °F
LED - it shows the current temperature scale (°F).
LED - condensate drain solenoid valve activated.
●
set
and
flashes because the DewPoint is too high – see specific point.
flashes because the DewPoint is too low - see specific point.
flashes because the probe is faulty or interrupted, the
) on - each minute (ToF), if standard
button.
button for at least 5 seconds. In this way
Value Set
range value
01 ... 20 02
01 ... 20 01
0.0 ... 20.0 20
00 ... 20 20
°C ... °F °C
AdL (signal delay) = 30 sec
esc
and
GB
Equal to
2 sec
1 min
20°C
20 min
°Celsius
button. If