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MW4808034-Temperature-Controlling-System-Instruction-Manual
author:P&N Tech   Time : 2016-08-01 browse:151
1 Overview 

     “MW4808034 controller system” is designed for the TEC cabinet air conditioning with automatic switching of a cooling and heating temperature control system. Two ways for fan output, respectively used  for internal circulation and external heat exchange; refrigeration device can automatically switch heating and cooling output; hydrogen exhaust fan output, for replacement of the air circulating inside; it has a variety of fault alarm , dry contact relay output and LED indication, as well as voltage protection and remote monitoring, a remote PC equipment to monitor the performance of the temperature control system. 


2 Technical specification
2.1 Technical parameters:

 

  Technical Item  

 Unit

Parameters

Ø Maximum voltage

VDC

60

Ø Rated voltage

VDC

48

Ø Rated current

A

8

Ø Temperature range

-40~110

Ø Temperature precise tolerance

±0.1

Ø Hydrogen fan

VDC/A

48/3

Ø Internal circulation fan

VDC/A

48/2

Ø Internal circulation fan

VDC/A

48/2


2.2 Interface specification:
1)Power input DC48V.
2)NTC Sensor Interface
3)AC switch signal input interface (normally closed).
4)TEC working power output DC48V.
5)Exhaust fan hydrogen power MOS tube output DC48V
6)Inner fan Interface: Power +, PWM signal output, fan speed feedback signal, power -
7)Outer fan Interface: Power +, PWM signal output, fan speed feedback signal, power -
8)General alarm relay normally open / normally closed dry contact output
9)485 communication interface GND (do not take), 485B (T / R -), 485A (T / R +)
10)Display Interface (reserved) 
11)Smoke control interface (reserved)
12)Humidity control interface (reserved)
13)Access control interface (reserved)

3 Temperature Control System Wiring
3.1 Electrical connection diagram


3.2 Electrical connection physical map
Please read《MW4808034 controller wiring scheme》

4 Product function
4.1 Self-test

      After power (or press the RESET button) Start self-test function control panel, temperature sensor - outside the fan - internal cooling fan --TEC. Green light flashes when the self-test, hardware failure is detected by the red light for about 5 seconds, the self-test completed: 
a.No alarm Green The normal operation of the control panel. 
b.When an alarm is often red Steady green
4.2 Cooling
     When the cabinet internal temperature is higher than opening point of refrigeration ,it starts the cooling operation, when the temperature is below the cabinet refrigeration stop point, the cooling operation is stopped. When setting the cooling temperature point, stop point temperature should be below opening point temperature.
Cooling point parameters setting

Parameters

Default value

Setting Range

Description

Description for setting point

Refrigeration opening point

25

[2045]

  The temperature point is set when the refrigeration operation starts to run

Refrigeration stopping point

15

[1035]

The temperature point is set when the refrigeration operation stops to run

Cooling Chart:
Turn on TEC and closed it again, the outer circulation fan will delay 20 seconds before shutdown.
4.3 Heating
     It begins the heating operation when the cabinet internal temperature is below the heating opening point. The cooling operation is stopped when the temperature is higher than the cabinet cooling stop point. Stopping point temperature should be higher than opening point temperature,when set the cooling temperature point.
Heating parameters setting

Parameters

Default value

Setting Range

Description

Description for setting point

Heating opening point

5

[0~15]

The temperature point is set when the heating operation starts to runt

Heating stopping point

15

[10~20]

The temperature point is set when the heating operation stops to run

Heating running chart:
 Turn on TEC and closed it again, the outer circulation fan will delay 20 seconds before shutdown.
4.4Internal circulation fan control
    In the range of refrigerate point and heating point, internal circulation fan is running slowly at 2500 rpm (speed can set as your own). When the temperature reach refrigerate point or heating point, TEC start to work, internal circulation fan is running quickly at 2500 rpm (speed can set as your own)
Internal circulation fan control chart

4.5 External circulation fan control
     When the temperature reach refrigerate point or heating point, TEC start to work, external circulation fan is running quickly at 2850 rpm(speed can set as your own).
External circulation fan control chart

 Turn on TEC and closed it again, the outer circulation fan will delay 20 seconds before shutdown.
4.6 Dehydrogenating fan control
     Dehydrogenating fan output can be directly with DC ventilator. Hydrogen discharge time is 5 minutes, 24 hours interval is adjustable.
Dehydrogenating parameters setting

Parameters

Default Value

Set Range

Description

Set Point Description

Dehydrogenating period

24

[1-100]

hours

dehydrogenating period of start-up

Dehydrogenating working time 

5

[1-30]

minutes

dehydrogenating opening time 


Dehydrogenating fan working control chart



Dehydrogenating fan connector is “active output”,please do not short connect it.
4.7 Fault Alarm
The temperature control system has the function of fault detection and fault alarm. Below is the condition and phenomenon for alarm:

Parameters

Default Value

Set Range

Unit

Description

External Fan

The Reaction of TE When Alarming

high temperature alarm

55

[30 –55]

trigger point of high temperature alarm

Keeping working

Keeping working

low temperature alarm

0

[-40 –10]

trigger point of low temperature alarm

Keeping working

Keeping working

Internal recycle fan default alarm

--

--

--

/

Stop working

Stop working

Extrinsic cycle fan default alarm

--

--

--

 

/

Stop working

Stop working

TE module default alarm

--

--

--

/

Stop working

Stop working

Over voltage default alarm

59

--

--

Voltage input59VDC

Keeping working

Keeping working

 Under voltage default alarm

44

--

--

Voltage input44VDC

Keeping working

Keeping working

NTC sensor alarm

--

--

--

Sensor fault

Keeping working

Keeping cooling


If any of the above condition appears, the indicator light of alarm turn red.
Warning output: Divided into “relay dry contacts output” and “LED indicator light output”.
Relay dry contacts please see the chapter of <temperature control system interface>.  
LED indicator light output please see the chapter of <LED indicator light>.
4.8 Remote Monitoring
Temperature control system has the function of RS485 and remote monitoring, it can monitor the  condition of temperature control system in real time through remote monitor software.

5 Temperature Control System Interface
5.1Power Interface

The chart below, you can find the definition of power interface, and also please consult the picture below.

Interface Name

Interface Function

Wire Specification

Remarks

Power+

The DC Power input into positive plate

18AWG Red

 

Power-

The DC Power input into negative plate

18AWG Black

        
5.2 Sensor Interface
The chart below, you can find the definition of sensor interface, and also please consult the picture below

Interface Name

Interface Function

Wire Specification

Remarks

NTC

NTC

 

No distinction electrode

NTC

NTC

 

No distinction electrode


5.3 TEC Interface
The chart below, you can find the definition of TEC interface, and also please consult the picture below.

Interface Name

Interface Function

Wire Specification

Remarks

NTC

NTC

 

No distinction electrode

NTC

NTC

 

No distinction electrode


5.4 Fan Interface
     The chart below, you can find the definition of fan interface, and also please consult the picture below.

Interface Name

Interface Function

Wire Specification

Remark

DC48V+

The fan interface input into positive electrode

RED

Internal (External)

PWM speed governing

Fan speed-transfer

BLUE

Internal (External)

speed feedback

Fan speed test

YELLOW

Internal (External)

DC48V-

The fan interface input into negative electrode

BLACK

Internal (External)

5.5 Dehydrogenating Interface
The chart below, you can find the definition of dehydrogenating interface, and also please consult the picture below.

Interface Name

Interface Function

Wire Specification

Remark

H+

The Dehydrogenating fan input into positive electrode

Red

 

H-

The Dehydrogenating fan input into negative electrode

Blue

 
For battery-free freezer, this interface can be ignored.

5.6 Alarm Interface
The chart below, you can find the definition of fan interface, and also please consult the picture below.

Interface Name

Interface Function

Wire Specification

Remark

NO

Normally open dry contact

Red

The internal switch connected to COM in case of failure

COM

common port

Black

Public interface

NC

Normally closed dry contact

Yellow

The internal switch connected to COM under no-fault


If alarm Interface is not connected, it will not affect the function of temperature control system.
Dry contact, referring to the passive output. Only a relay switch. Specific reference to the connection 《MW4808O34 temperature control system wiring diagram》
5.7 Remote Monitoring Interface
     The chart below, you can find the definition of remote  monitoring interface, and also please consult the picture below.

Interface Name

Interface Function

Wire Specification

Remark

A

RS485 differential positive electrode

RED

 

B

RS485 differential negative electrode

BLUE

 

GND

Ground Wire

BLACK

can be left open


6 LED Indicator Light
There are two kinds of color on the control panel, below is the definition:

LED

Statements

Colors

Indicator status

Definition

Power indicator light

Normal operation

GREEN

LIGHTING

Normal operation

FLASHING

Self test

OFF

             No power

Alarm indicator light

Alarm

RED

     LIGHTING

Default  

OFF

No alarming


7 Product usage
1、Interface Operation(Reserved)
2、Remote Control Operation
Refer to “MW temperature controlling system instruction manual”

8 Operation Flow Chart