Documentation:

MCK-301-3 (MEGAFON)
CONTROLLER FOR TEMPERATURE DEVICE CONTROL

1. Applications

The MCK-301-3 controller for temperature devices control is designed for:

  • indoor temperature monitoring;
  • climate devices control according to measurement data;
  • alarm signaling with a corresponding indication about user-specified maximum indoor temperature exceeding;
  • signaling if user-specified minimum indoor temperature is reached;
  • all temperature devices cut-out when a fire alarm signal appears;
  • the average indoor temperature indication;

2. TECHNICAL BRIEF

2.1. Analog inputs: there are 2 inputs for PTC sensors with reinforced electric insulation for temperature monitoring; A digital fire alarm input (the decision is made according to «closed/open» state);

2.2. Main outputs:

  • two-way break-before-make relay output for the 1st climate device control - 8A 250V at cosφ=1;
  • a normally open relay output for the 2nd climate device control - 8A 250V at cosφ=1;
  • a normally open relay output for the signaling cut-in that communicates about the user-specified minimum temperature reaching - 8A 250V at cosφ=1;
  • an opto-relay output to cut-in the alarm signaling about the user-specified maximum temperature exceeding - 100 mA ~AC or =DC;

2.4. Temperature resolution - 0.1 ° C;

2.5. Nominal supply voltage: one-phase voltage is 220V/ 50Hz or three-phase voltage is 380V/ 50Hz;

2.6. Operating voltage: 160V - 330V;

2.7. Power consumption is no more than 5Wt;

2.8. Enclosure: IP40;

2.9.Terminal block enclosure: IP20;

2.10. Operating temperature: -10 °C to +55 °C;

2.11. Storage temperature: -45 °C to +75 °C;

2.12. Weight is no more than 0,3kg;

2.13. Mounted on the standard 35 mm DIN-rail;

2.14. Mounting position is arbitrary.

2.16. Operating controls and the dimensions of the device are shown on fig.1.

3. PRE-SRARTING PROCEDURE

3.1. Connect electric heaters, fire alarm sensor, alarm signalling and temperature sensors according to fig.2 .

3.2. Plug-in the MCK-301-3.

3.3. Power ON and set required operation modes according to the table 2.

NOTE. All connections must be performed on dead device.
MCK301wiring

Note . Button "▲" - UP in the text, button "▼" - DOWN in the text.

Fig. 1. MCK-301-3 front panel, indications and buttons diagram.

LED COMP glows when compressor is ON;

WIRING DIAGRAM

MCK301wiring
Fig. 2. The MCK-301-3 connections to the three-phase mains supply.
Note1. For the MCK-301-3 connection to single-phase mains supply the 1,2,3 terminals must be connected in parallel.

4. The MCK-301 control levels

At the initial state the MCK-301-3 indicator displays the current indoor temperature as the average value of the temperature sensor ¹1 and the temperature sensor ¹2. On one of the temperature sensors fault the indicator shows the temperature measured by the serviceable sensor and an error code for the faulty temperature sensor.

The controller provides three control levels:

4.2. Keyboard locking level

Only viewing of the following parameters is available on this level:

  • temperature setting, SP;
  • temperature of the first temperature sensor, tS1;
  • temperature of the second temperature sensor, tS2.

To view parameters one needs to press simultaneously the DOWN and the UP buttons, the parameters scrolling is performed by the DOWN and the UP buttons, to access a parameter it's necessary to press the SET button.

When the keyboard is locked any button pressing (except simultaneous the UP and the DOWN buttons pressing) makes to appear the LOC label on the indicator. To unlock the keyboard the SET button is pressed. The "SET" LED lights up, and label "0" is blinking on the indicator. By the UP and DOWN buttons user enters a password digit from 1 to 9 and presses the DEF button. If the password is correct, the keyboard is unlocked. If after the keyboard unlocked no button is pressed during 16 sec and the lockage setting is not released by user, the keyboard is relocking.

If label "LOC" is displayed on the indicator, one can go to adjuster level skipping user password enter. To do that one needs to press SET button for 5 sec (then proceed following 4.4).

4.3. User level with keyboard unlocked

This level allows:

  • to change and to view the user level parameters;
  • to view the adjuster level parameters.

To view and to change the user level parameters one needs to press the SET button, then "SET" LED will glow. Parameters scrolling is performed by the DOWN and UP buttons, to access a parameter one needs to press the SET button, parameters changing is effected by the DOWN and UP buttons, to set the parameter and go back into the MENU one needs to press the DEF button, going back to the menu without parameter setting is effected by the SET button. If no button is pressed during 16 sec the MCK-301-3 goes into the initial state.

4.4. Adjuster level

To access the adjuster level one needs to press and hold down SET button for 5sec. If the level is protected by a password, the label PAS appears on the indicator. Then press the SET button again. The "SET" LED lights up and the label "000" starts blinking on the indicator. Step-by-step enter three digits (from 1 to 9) of the adjuster password, pressing the DEF button after each digit has been entered. If the password is incorrect, the PAS label lights on (S is blinking), and the MCK-301-3 goes back to the initial state in 16 sec, otherwise the first parameter of the adjuster menu appears on the indicator.

Parameters scrolling is performed by the DOWN and UP buttons, to access a parameter one needs to press the SET button, parameter changing is effected by the DOWN and UP buttons, to set a parameter and go back into the menu one needs to press the DEF button, going back to the menu without parameter setting is effected by the SET button. If no button is pressed during 16 sec the MCK-301-3 goes into the initial state.

On the adjuster level the access to any user level parameter can be inhibited or permitted by simultaneous the SET and DOWN buttons pressing. If the access is inhibited a point indication appears on the right digital indicator when one is viewing the parameter value.

5. The MCK-301-3 modes of operation

5.1. The controller provides the following modes of operation:

  • thermostat conditions;
  • alarm conditions;
  • diagnostic conditions.

5.2. Thermostat conditions

5.2.1. Parameters SP (electric heater cut-out temperature), and t_H (electric heater cut-in temperature) specify the indoor temperature conditions.

If the indoor temperature is below t_H, the electric heaters are ON and they will operate until the indoor temperature exceeds SP.

5.2.2. If both temperature sensors are faulty the two electric heater relays are off, the indicator sequentially shows temperature sensor fault codes. Erd code and the alarm goes off.

5.2.3. In the thermostat conditions the MCK-301-3 controller performs the indoor temperature monitoring and signals if the temperature goes outside the preset range (HAL and LAL parameters).

If the indoor temperature exceeds HAL parameter the indicator shows A1code and the alarm cuts-in signaling that the maximum temperature is exceeded. The alarm system will cut-out when the indoor temperature drops below HAL-HHS value.

If the indoor temperature is below LAL parameter the indicator shows A2 code and the alarm cuts-in signaling that the minimum temperature is reached. The alarm system will cut-out when the indoor temperature exceeds LAL+LLS value.

5.2.4. To disable premature alarm trippings for temperature the tAO and PAO parameters are used. tAO is alarm tripping time delay for temperature (in minutes) and PAO is alarm tripping time delay for temperature after power has been applied (in hours).

5.2.5. If the fire alarm goes off (the 5,6 contacts open), electric heater relays cut out and the Fir code is displayed on the indicator.

5.3. Diagnostic conditions.

To go to the diagnostic conditions the SET and the DOWN buttons are pressed simultaneously. Then the indicator displays tES code and all the relays are energized. In 15 sec delay the MCK-301-3 goes back to the thermostat conditions

5.4. All fault state codes are displayed on the digital indicator according to the Table 1.

5.5. The controller operation algorithm is given in the Table2.

Fault codes
Table 1.

Fault signals on the indicator Alarm signals on the indicator
Fault in controller Er1 Temperature is higher then the maximum temperature threshold A1
Sensor 1 is disconnected Er2

Temperature is below the minimum temperature threshold

A2
Short-circuited sensor 1 Er3 Both temperature sensors are faulty Erd
Sensor 2 is disconnected Er4 Fire alarm sensor goes off Fir
Short-circuited sensor 2 Er5
Operation algorithm
Table 2.
¹ Event Output relay position
16;17 18;19 20;21 22;24
1. Temperature < t_H C C C C
2. Temperature ≥ SP C C O O
3. Temperature ≥ HAL O C O O
4. Temperature ≤ LAL C O O O
5. Both temperature sensors are faulty O O O O
6. Fire alarm signal (the 5,6 contacts are open)

Dependent on the indoor temperature

O O

7. Programmable and used parameters are given in table 2.

Table 3
Settings and read-off parameters Code Param eter Mini- mum values Maxi- mum values Facto- ry Setting Operation
Temperature control Temperature SP SP 0°C 35°C 18°C Electric heater cut-out temperature
Lower temperature threshold t_H 0°C 35°C 15°C Electric heater cut-in temperature
Upper fault temperature threshold HAL 0°C 45°C 30 °C Temperature when reached makes to cut-in alarm system signaling that the maximum temperature is reached.
Upper fault temperature hysteresis HHS 0°C 20°C 3°C  
Lower fault temperature threshold LAL 0°C 35°C 10 °C

Temperature when reached makes to cut-in the alarm system signaling that the minimum temperature is reached

Lower fault temperature threshold hysteresis LLS 0°C 20°C 3°C  
1st temperature sensor calibration (in 0.1 °C) CA1 -9.9°C 9.9°C 0 °C CA1 scale shift from temperature read by 1st sensor
2nd temperature sensor calibration (in 0.1 °C) CA2 -9.9°C 9.9°C 0°C CA2 scale shift from temperature read by 2nd sensor
Fault temperature delay tAO 0 90 min 15 min  
Fault temperature delay after power has been ON PAO 0 24 hours 1 hours  
Minimum electric heater cut-in delay N01 0 min 15 min 1 min Electric heater protection from frequent cuts-in
Minimum electric heater cut-out delay n02 0 min 15 min 1 min Electric heater protection from frequent cuts-in
User access code LOC 0 9 0

0 - keyboard is unlocked
1-9 - user password

Adjuster access code PAS 000 999 123

000 - access to adjuster level is allowed;
000-999 - adjuster password.

Temperature sensor type yPd 0 1 1

0 - NTC,
1 - PTC (in the present version PTC are not used)

Controller version rEL 3
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