6.3.2 Forced Defrost
6.3.3 Functions Lockdown
To unlock, turn off the controller and reconnect it with the> key pressed. Keep the key pressed until the
message [LOC,] appears. When realizing it, the message [OFF,] will appear on the display.
6.3.4 Control Functions Shutdown
Forced defrost is carried out through the quick access menu. Press the ; key (quick touch) until the
message [defr] appears (flashing @LED), then press key /(quick touch) to select. Then, the
message [defr][On,,] appears ( access @LED).
To turn off defrost manually, press key ;(quick touch) until the message [defr] appears (flashing
@LED). Press the/ key (quick touch) to select. Then, the message [defr] [OFF,] appears
(LED @ off).
For safety reasons, this controller provides the ability to lock functions. With this setting enabled, the
setpoint and the other parameters are protected against unauthorized changes. However, they can be
visualized. In this condition, when trying to change these values, the message [LOC,] appears on
display. To perform the functions lockdown it is necessary, first, that parameter “[,F20] - Time for
functions lockdown ” parameter is set to a value higher than 14 ( if lower than 15, the message
[no,,] is shown, which means not allowing the lockdown of functions). With key ;(quick touch),
select , then press /(quick touch), then keep the > key pressed until [LOC,] appears. When
releasing the key, the message [On,,] will appear.
With the shutdown of the control functions the controller will operate only as a temperature indicator and
output relay stays off.
The way to operate the control functions shutdown depends on the parameter setting “[,F21]-
Control functions shutdown”:
[,,,0]Does not allow the shutdown of the control functions.
[,,,1]Allows to turn on and off the control functions only if the functions are unlocked.
[,,,2]Allows to turn on and off the control functions even when the functions are locked.
With key ;(quick touch), select , then press /(quick touch) to confirm.
Then, the message [ctrl][Off,] will appear. At this time the temperature display will switch to the
[OFF,]message.
To turn the control functions on again, just follow the same procedure as that for shutdown, selecting
with the ; key (quick touch), .Once the user presses the / key the message [ctrl][On,,]will
appear.
NOTE: When turning the control functions back on, the will continue
respecting functions “[,f09]- output off minimum time” and “[,f12] - Initial status when
energizing the instrument.
MT-512 e 2HP
6.3.5 Visualization of Processes
6.3.6 Minimum and Maximum Temperature Record
To view the status and the elapsed time, press>(short press). Thus, the controller will display the
status of the current process. the following messages may appear on the display:
[----]control off
[del,]initial delay
[refr]cooling
[HoT,]heating
[defr]defrost
By pressing key < or also through the quick access menu (see chapter 6), the message [rEg,] will
appear, followed by the minimum and maximum recorded temperatures.
To turn the current minimum and maximum values off, press key ;(short press), until the message
[CrEg]is displayed. Press key/to confirm.
6.3.7 Unit Selection
To determine the unit in which the instrument will operate, enter function “[,F01]” with access code
[,231] press key /now the user can select the unit by pressing keys <>where the messages
[,=C,]or[,=F,] will alternate. Press key /to confirm the desired unit. Then, the indication that
corresponds to the unit {or} will come on.
Every time the unit is changed, the parameters must be reconfigured, since they are assumed the
"standard" values.
6.4 ADVANCED OPERATIONS
6.4.1 Changing the parameters of the controller
Access function [,F01]pressing keys <and> simultaneously or through the quick access menu.
After that, [,F01] will appear, then, press the/ key (short press). Use keys <or >to enter with
access code [,123] and, when ready, press /. Use keys <or> to access the desired function.
After selecting the function, press the key/ (short press), to visualize the set value for that function.
Use keys <or> to change the value, and when ready, press/ to memorize the set value and return
to the functions menu. To exit the menu and return to normal operation (temperature indication)
press/(long press) until [----].
NOTE: In case temper proof function is active, when pressing keys <or>, the controller will show
message [LOC] in the display and will not allow the setting of parameters.
Access code: 123 (one hundred and twenty-three)
Desired temperature (Setpoint)
Indication displacement (Offset)
Minimum set point allowed to the end user
Maximum set point allowed to the end user
Control differential (hysteresis)
Operating mode
Minimum output time on
Minimum output time off
Cooling time (interval between defrosts)
Defrost time
Initial status when energizing the instrument
Temperature indication locked during defrost
Instrument energization delay
Additional time at the end of the first cycle
Compressor status with the sensor inoperative
Compressor time on in case of error
Compressor time off in case of error
Digital filter intensity
Time for functions lockdown
Control functions shutdown
[,F01]
[,F02]
[,F03]
[,F04]
[,F05]
[,F06]
[,F07]
[,F08]
[,F09]
[,F10]
[,F11]
[,F12]
[,F13]
[,F14]
[,F15]
[,F16]
[,f17]
[,f18]
[,F19]
[,F20]
[,F21]
DescriptionFun Min Max Unit
-
-
5.0
200
200
20.0
1-heat.
999
999
999
999
1-defr.
yes.
240
240
2
999
999
9
60
2
-
°C
°C
°C
°C
ºC
-
sec
sec
min
min
-
-
min
min
-
min
min
-
sec
-
CELSIUS
-
-
-9
-58
-58
1
no
no
1
no
no
no
no
0
1
1
no
no
no
0-cool.
0-cool.
-
-
9
392
392
36
1-heat.
999
999
999
999
1-defr
yes
240
240
2
999
999
9
60
2
-
°F
°F
°F
°F
°F
-
sec
sec
min
min
-
-
min
min
-
min
min
-
sec
-
FAHRENHEIT
Min Max Unit
Standard
-
-
-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
6.5 PARAMETERS TABLE
F01 - Access code:
The has 2 different access codes:
[,123] It allows to modify the advanced parameters
[,231] It allows to choose the temperature unit, Celsius or Fahrenheit
F02 - Desired temperature (Setpoint):
It is the reference value for temperature control, that is, the temperature to be maintained in a controlled
environment.
F03 - Indication displacement (Offset):
It allows to compensate any deviations in temperature caused by a sensor change or alteration of the
cable's length.
F04 - Minimum setpoint allowed to the end user:
It prevents that, by mistake, the setpoint temperature is set unreasonably low.
F05 - Maximum setpoint allowed to the end user:
It prevents that, by mistake, the setpoint temperature is set unreasonably high.
F06 - Control differential (hysteresis):
It is the difference in temperature (hysteresis) between turning ON and OFF the cooling (or heating)
Example: If it is desired to control the temperature at 4.0 °C with a differential of 1.0 °C. Therefore, the
cooling is switched off at 4.0 °C and switched back on at 5.0 °C (4.0 + 1.0).
MT-512 e 2HP
F07 - Operating mode:
It allows to set the operating mode of the controller.
[,,,0]Cooling
[,,,1]Heating
F08 - Minimum output time on:
It is the minimum time the compressor will stay on, that is, the time interval between the last start and the
next stop.
F09 - Minimum output time off:
It is the minimum time the compressor will stay off, that is, the time interval between the last stop and the
next start. It serves to relieve discharge pressure and increase the service life of the compressor.
Temperature [°C]
Setpoint
Cooling
Setpoint + Hysteresis
Time [S]
Relay OFF
Relay ON
4°C
5°C
Temperature [°C]
Setpoint
Heating
Setpoint - Hysteresis
Time [S]
4°C
5°C
Standard
Relay OFF
Relay ON
F10-Cooling time (interval between defrosts):
It corresponds to the time the controller will act on cooling. At the end of this time, the controller enters
the defrost process.
F11 - Defrost time:
It is the defrost time. During this period, the relay will remain off. At its end, the controller will return to the
cooling state.
F12 - Initial status when energizing the instrument:
It allows to carry out a defrost at the time the controller is energized.
MT-512 e 2HP
MT-512 e 2HP
MT-512 e 2HP
Legend: [yes,]= yes
[no,,]= no
6.5.1 Parameters description
