Documentation:

MCK-301-2
CONTROLLER FOR TEMPERATURE DEVICE CONTROL

1. Applications

The MCK-301-2 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;
  • change of status between air conditioners from main to stand-by after user-set time delay has expired;
  • switching to an operational air conditioner and signaling about a fault when one of the air conditioners is faulty;
  • all temperature devices cut-out when there is a fire alarm signal;
  • the average indoor temperature indication;
  • indication of the climate device that is cut-in in the moment.

2. TECHNICAL BRIEF

2.1. Analog inputs: there are 2 inputs for PTC sensors with reinforced electric insulation for temperature monitoring;

2.2. A digital fire alarm input (the decision is made according to "closed/open" state, closed state corresponds to the running order, open state corresponds to the fire alarm signaling);

2.3. Two digital inputs for air conditioner fault sensors (if closed the air conditioner is faulty);

2.4. 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 electric heater control - 8A 250V at cosφ=1;
  • an opto-relay output to start the alarm signaling - 100 mA ~AC or =DC;

2.5. Temperature resolution - 0.1 ° C;

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

2.7. Operating voltage: 160V - 330V;

2.8. Power consumption is no more than 5Wt;

2.9. Enclosure: IP40;

2.10.Terminal block enclosure: IP20;

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

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

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

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

2.15. 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 1st air conditioner, 2nd air conditioner, electric heater, fire alarm sensor, alarm signaling and temperature sensors according to fig.2.

3.2. Plug-in the MCK-301-2.

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

NOTE. All connections must be performed on dead device.
MCK301

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

Fig. 1. MCK-301-2 front panel, indications and buttons diagram.

LED COMP glows when air conditioner ¹1 is ON;
LED FAN glows when air conditioner ¹2 is ON;
LED DEF glows when electric heater is ON;

WIRING DIAGRAM

MCK301wiring
Fig. 2. The MCK-301-2 connections to the three-phase mains supply.
Note 1. For the MCK-301-2 connection to single-phase mains supply the 1,2,3 terminals must be connected in parallel.
Note 2. To elongate the MCK-301-2 service life it's recommended to connect air conditioners to the circuit with the interposition of pilot relays or starters.
Note 3. If only one air conditioner is connected (parameter nCo=1) it must be connected to the MCK-301-2 22 contact.

4. The MCK-301-2 control levels

At the initial state the MCK-301-2 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.

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-301-2 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-301-2 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-301-2 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-301-2 modes of operation

5.1. The controller provides the following modes of operation:

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

5.2. Thermostat conditions

If two air conditioners are connected to the MCK-301-2 and the parameter nCo=2. the air conditioners are working in such mode of operation as "a main air conditioner - a stand-by air conditioner". The ttC parameter specifies the operating time for each air conditioner. After the time has expired the other air conditioner starts working.

5.2.2. 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 heater is ON and it will operate until the indoor temperature exceeds Set Point.

If the indoor temperature exceeds the programmable SP+tC1 parameter, the air conditioner that considered to be the main one at the moment is ON and it will operate until the indoor temperature drops below Set Point.

If the indoor temperature exceeds SP+tC1+tC2, the stand-by air conditioner is ON and it will operate until the indoor temperature drops below Set Point.

EXAMPLE. According to factory settings SP=18, t_H=3, tC1=4, tC2=3:

  • lower temperature threshold is SP-t_H=18-3=15 (electric heater ON-temperature is 14, 9 C);
  • the first upper temperature threshold is SP+tC1=18+4=22 (cut-in temperature of main air conditioner is 22,1 );
  • the second upper temperature threshold is SP+tC1+tC2=18+4+3=25 (cut-in temperature of stand-by air conditioner is 25,1 ).

5.3. Alarm conditions

5.3.1. 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.

5.3.2. In the thermostat conditions the controller performs the indoor temperature monitoring and signals if the temperature goes outside the preset range.

If the indoor temperature exceeds user-preset temperature (HAL parameter) the indicator shows A1code and the alarm cuts-in.

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.

To disable premature alarm trippings for temperature 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).

5.3.3. If air conditioner safe operation control is allowed (dAc=1) the faulty air conditioner is OFF and the stand-by air conditioner is ON. On return the faulty air conditioner to normal operating conditions the MCK-301-2 reverse the air conditioners.

5.3.4. 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.

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

5.3.6. If any of faults referred to above occur the controller triggers alarm system (the 16,17 contacts open).

NOTE: If several faults take place simultaneously the fault codes are displayed on the MCK-301-2 indicator sequentially one after another.

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

Both temperature sensors are faulty

Erd
Short-circuited sensor 1 Er3 Fire alarm sensor goes off Fir
Sensor 2 is disconnected Er4 Faulty air conditioner 1 CO1
Short-circuited sensor 2 Er5 Faulty air conditioner 2 CO2

5.4. To go to the diagnostic conditions the SET and the DOWN buttons are pressed. Then the indicator displays tES code and all relays are energized. In 15 sec delay the MCK-301-2 goes back to the thermostat conditions.

6. 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  
Lower temperature threshold t_H 0°C 20°C 3°C  
First upper fault temperature threshold tC1 0°C 20°C 4°C  
Second upper fault temperature threshold tC2 0°C 20°C 3°C  
1st temperature sensor calibration CA1 -9.9°C 9.9°C 0 °C CA1 scale shift from temperature read by 1st sensor
2nd temperature sensor calibration CA2 -9.9°C 9.9°C 0°C CA2 scale shift from temperature read by 2nd sensor
Fault temperature HAL 10°C 50°C 30°C The maximum temperature. If exceeded the alarm signaling for temperature goes off.
Fault temperature delay tAO 0 90 min 30 min

 

Fault temperature delay after power has been ON PAO 0 48 hours 1 hour  
Minimum air conditioner cut-in delay c01 1 min 15 min 1 min

Air conditioner protection from frequent cuts-in

Minimum air conditioner cut-out delay c02 1 min 15 min 1 min Air conditioner protection from frequent cuts-in
Minimum electric heater cut-in delay n01 1 min 15 min 1 min

Electric heater protection from frequent cuts-in

Minimum electric heater cut-out delay n02 1 min 15 min 1 min Electric heater protection from frequent cuts-in
Delay between air conditioner cut-out and electric heater cut-in or between electric heater cut-out and air conditioner cut-in cnt 0 min 30 min 5 min

Heat oscillatory process prevention

Analysis resolution of air conditioner safe operation sensors dAc 0 1 1 0 – air conditioner safe operation sensors are off;
1-- air conditioner safe operation sensors are on.
Fire alarm sensor analysis resolution dAF 0 1 1 0 – fire alarm sensor is off;
1 – fire alarm sensor is on.
Number of connected air conditioners nCO 0 2 2  
Delay of status change of working air conditioner ttC 24 hours 72 hours 24 hours  
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 tPd 0 1 1 0 - NTC,
1 - PTC
Controller version rEL 20
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