8.4.1. Adjustment of the parameters
Access the function
[,F01]
by pressing simultaneously the keys
<
and
>
or by the facilitated menu.
When
[,F01]
is displayed, press the key
/
(short touch).
Use the keys
<
or
>
to enter with the access code
[,123]
and, when ready, press
/
.
Use the keys
<
or
>
to access the desired function.
After selecting the function, press the key
/
(short touch), to view the value set for that function. Use
the keys
<
or
>
to alter the value and press
/
to memorize the value set and return to the function
menu.
To exit the menu and return to the normal operation (temperature indication), press
/
(long touch) until
[----]
is displayed.
NOTE 1:
If function blocking is active, pressing the keys
<
or
>
, the controller will display
the
message
[LOC,]
and parameters will not be allowed to be altered.
NOTE 2:
15 seconds after supplying the access code and/or after setting a parameter, with no touches
in the buttons, the controller returns to the operation mode and the access code will have to be entered
again in function F01.
8.4.2. Parameters table
8.4.3. Parameters description
F01 - Access codes:
The
is provided with two different access codes:
[,123]
Allows changing the advanced parameters.
[,231]
Allows selecting the temperature unit: Celsius or Fahrenheit.
F02 - Desired temperature (Setpoint):
This is the reference value for temperature control, i.e., the desired temperature to maintain in the
controlled environment, or the temperature at which the load supply output is turned off.
F03 - Indication shifting (Offset):
It allows the offsetting of any temperature deviations in view of the sensor replacement or alteration in
the cable length.
F04 - Minimum setpoint allowed to the user:
Avoid selection, by mistake, of extremely low setpoint temperatures.
F05 - Maximum setpoint allowed to the user:
Avoid selection, by mistake, of extremely high setpoint temperatures.
F06 - Control differential (hysteresis):
This is the difference in temperature (hysteresis) between turning the refrigeration (or heating) ON and
OFF.
Examples:
- Refrigeration:
One wants to control the temperature at 4.0 °C with a differential of 1.0 °C: the output
will be turned off at 4.0 °C and turned on again at 5.0 °C (4.0 + 1.0).
- Heating:
One wants to control the temperature at 30.0 °C with a differential of 5.0 °C: the output will be
turned off at 30.0 °C and turned on again at 25.0 °C (30.0 – 5.0).
NOTE:
Using very low hysteresis values will cause a high frequency at the on and off action of the relay,
reducing its service life.
F07 - Operation mode:
Allows selecting the controller operation mode:
[,,,0]
Refrigeration
[,,,1]
Heating
F08 - Minimum output-on time:
This is the minimum time in which the load will remain on, i.e., the interval between the last start and the
next stop.
F09 - Minimum output-off time:
This is the minimum time in which the load will remain off, i.e., the interval between the last stop and the
next start. In the case of refrigeration, one relieves the discharge pressure, increasing the compressor
service life.
F10 - Refrigeration time (defrost interval):
Corresponds to the time in which the controller will operate in refrigeration. After this period, the
controller starts the defrost process.
F11 - Defrost time:
This is the defrost duration time. Within this period, the relay will remain off. After this period, the
controller will return to the refrigerated state.
MT-512
e
2HP
F12 - Initial state when powering the instrument on:
When selecting the option
[,,,0]
(Refrigeration), the controller starts the refrigeration.
When selecting the option
[,,,1]
(Defrost), the system will perform defrost when the controller is
powered on. Duration of defrost will be according to parameter F11.
F13 - Locked temperature indication during defrost:
Select the acronym
[No,,]
for not locking the indication and
[yes,]
to lock it.
With the indication locked, this will only be released at the next refrigeration cycle after the temperature
reaches again this ‘locked’ value or after 15 minutes in refrigeration (as a safety measure).
F14 - Instrument powering-on delay:
When the instrument is turned on, this may remain for a while with the control disabled, delaying the
process start. Within this period, it works only as a temperature indicator. This delay may occur with the
compressor or with defrost (when defrost is set at the start).
The goal is to avoid power demand peaks upon return thereof after fault, when several pieces of
equipment are connected in the same electric grid. The delays should be adjusted at different values for
each piece of equipment.
NOTE:
After the end of delay, the ‘minimum output-off time’ count is started (if it has been set in
parameter F09).
F15 - Additional time to the end of the first cycle:
It is used to increase the working time only of the first refrigeration cycle, increasing the efficiency.
F16 - Compressor situation with damaged sensor:
If the temperature sensor is undergoing short circuit, turned off or is off the measuring range, the
compressor assumes the state set in this parameter:
[,,,0]
Compressor off.
[,,,1]
Compressor on.
[,,,2]
Cycling according to times defined in F17 and F18.
NOTE: If it is in heating mode, and with some error, the output will be turned off.
F17 - Compressor-on time in the event of error:
It defines the minimum time during which the compressor will remain on, if the sensor is off or outside the
measuring range.
F18 - Compressor-off time in the event of error:
It defines the minimum time during which the compressor will remain off, if the sensor is off or outside the
measuring range.
F19 - Digital filter intensity:
This filter has the purpose of simulating thermal mass increase in the sensor, thus increasing its
response time (thermal inertia). The greater the value set in this function, the greater the sensor
response delay will be.
F20 - Function blocking time:
This functionality being active, the setpoint and the other parameters will be protected against undue
alterations, with only the setpoint and the parameters being visualized. In order to block the functions,
please refer to item 8.3.3. Function blocking.
F21 - Turning the control functions off:
Authorizes switching off the control functions (see item 8.3.4).
[no,,]
Disables the control functions shutdown.
[,,,1]
Enables activation/deactivation of the control functions only if the functions are unlocked.
[,,,2]
Enables activation/deactivation of the control functions even if the functions are locked.
[,,,3]
Enables activation/deactivation of the control functions only if the functions are unlocked.*
[,,,4]
Enables activation/deactivation of the control functions even if the functions are locked.*
* When F21 is configured as 3 or 4 and the control functions shutdown is activated, the controller will turn
off the display, keeping only the indication light on.
If any key is touched the display turns on by 5 seconds, turning off again until a new key is touched.
9. DISPLAY SIGNALINGS
10. GLOSSARY OF ACRONYMS
-
°C:
Temperature in Celsius degrees.
-
°F:
Temperature in Fahrenheit degrees.
-
Defr:
Defrost.
-
LOC:
Blocked.
-
No:
No.
-
OFF:
Turned off/disabled.
-
ON:
Turned on, enabled.
-
Refr:
Refrigeration.
-
SET
(as in "Setting") (setting or configuration).
-
Vac:
Electrical voltage (volts) of alternating current.
-
Vdc:
Electrical voltage (volts) of direct current.
-
Yes:
Yes.
Error in sensor: Sensor disconnected or damaged.
Control functions off.
Manual activation of the defrost process.
Manual activation of the cooling process.
Temper proof function.
Unlocking of functions.
Reconfigure the values of the functions.
[Er1,]
[OFF,]
[Defr][On,,]
[defr][Off,]
[LOC,][On,,]
[LOC,][OFF,]
[pppp]
Access codes
Desired temperature (Setpoint)*
Indication shifting (Offset)
Minimum setpoint allowed to the user
Maximum setpoint allowed to the user
Control differential (hysteresis)
Operation mode
Minimum output-on time
Minimum output-off time
Refrigeration time (defrost interval)
Defrost time
Initial state when powering the instrument on
Locked temperature indication during defrost
Instrument powering-on delay
Additional time to the end of the first cycle
Compressor situation with damaged sensor
Compressor-on time in the event of error
Compressor-off time in the event of error
Digital filter intensity
Function blocking time
Turning the control functions off
[,F01]
[,F02]
[,F03]
[,F04]
[,F05]
[,F06]
[,F07]
[,F08]
[,F09]
[,F10]
[,F11]
[,F12]
[,F13]
[,F14]
[,F15]
[,F16]
[,f17]
[,f18]
[,F19]
[,F20]
[,F21]
Description
Fun
Min
Max Unit
-
200
5.0
200
200
20.0
1-heat.
999
999
999
999
1-defr.
yes.
240
240
2
999
999
9
60
4
-
°C
°C
°C
°C
ºC
-
sec
sec
min
min
-
-
min
min
-
min
min
-
sec
-
CELSIUS
-
-58
-9
-58
-58
1
no
no
1
no
no
no
no
0
1
1
no
no
no
0-cool.
0-cool.
-
392
9
392
392
36
1-heat.
999
999
999
999
1-defr
yes
240
240
2
999
999
9
60
4
-
°F
°F
°F
°F
°F
-
sec
sec
min
min
-
-
min
min
-
min
min
-
sec
-
FAHRENHEIT
Min
Max Unit
Standard
-
-50
-5.0
-50
-50
0.1
0-cool.
no
no
1
no
0-cool.
no
no
no
0
1
1
no
no
no
-
39
0
-58
167
1
20
20
240
30
no
no
no
0
15
15
no
no
no
0-cool.
0-cool.
-
4
0
-50
75
1.0
0-cool.
20
20
240
30
0-cool.
no
no
no
0
15
15
no
no
no
Standard
Legend:
[yes,]
= yes
[no,,]
= no
*The minimum and maximum values depend on
the values configured in
[,F04]
and
[,F05]
.
