2
* Parameters ALFA 75-MTT.
Para-
meter
Description Parameter
Range
Default
value
01
02
03
04
Switching differential
Minimum adjustable set point
Maximum adjustable set point
Offset temperature sensor
0,1..15,0
C
0..+80
C
0..+80
C
-15,0..+15,0
C
0,5
0,0
15,0
0,0
10
11
12
Agitator interval time
Agitator runtime
Agitator delay time
0..60 Minutes
0..240 Seconds
0..900 Seconds
15
120
120
20
21
22
23
24
25
26
30
Minimum Alarm active
Maximum Alarm active
Minimum Alarm-set point
Maximum Alarm-set point
Delay time maximum alarm
Delay time minimum alarm
Cooling time alarm (See description)
Control delay after power up
0=No, 1=Yes
0=No, 1=Yes
0..80,0
C
0..80,0
C
0..99 Minutes
0..99 Minutes
90..240 Minutes
0..99 Minutes
1
1
0,5
15,0
45
0
120
15
31
32
Cooling on at sensor failure
Cooling off at minimum alarm
0=No, 1=Yes
0=No, 1=Yes
0
1
40
Function digital input cleaning
0 = Active when closed (NO)
1 = Active when opened (NC)
0..1
0
95
96
97
98
99
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
0..255
00..99
1..52
0..255
0..999
-
-
-
-
-
* Sensor adjustment.
The temperature sensor can be adjusted by using the Offset control sensor (parameter 04).
Indicates a sensor e.g. 2
C too much, the according Sensor-offset parameter has to be decreased with 2
C.
* Error codes.
On the display from the
ALFA 75-MTT
can appear the following error codes:
E1
- Temperature sensor defect.
Solution
E1
failure:
- Check if sensor is connected correctly.
- Check sensor (1000
/25
C).
- Replace sensor..
EEE
- Adjustments are lost
Solution
EEE
failure:
- Re-program the adjustments.
LO
- Minimum alarm.
HI
- Maximum alarm.
AL
- Cooling time passed
-L-
- In case of sensor short-circuit the display alternates between error-code
E..
and
-L-
, as indication for a short-circuit sensor.
-H-
- In case of open-circuit sensor the display alternates between error-code
E..
and
-H-
, as indication for a open circuit sensor.
* Alarm operation.
If a failure or alarm occurs an error message is shown in the display. The
ALFA 75-MTT
remembers it’s error
message, although it is already solved. The error message can be reset with the
SET
key.
If after pressing the
SET
key (=reset alarm) the alarm still is not solved than the
ALFA 55-MTT
displays the
temperature and the error message alternated, is the alarm solved, then the error message disappears and the
temperature is displayed normally.
