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Elstat EMS-55 Technical Instruction Manual Download Page 24

                                                                                                               

                                                  

24 

TECHNICAL DATA 
 
 

Input voltage  

12 Volt AC (from Elstat transformer) 

Maximum switch capacity per UL rating  
(120VAC/230VAC) 

Compressor  16 A FLA, 96 A LRA 
                      0.4 

– 0.5 p.f. 

Fan relay       4.4 A FLA 
Light relay    2.2 A FLA 

Maximum switch capacity per VDE rating 
(120VAC/230VAC) 

Compressor   12 A , p.f. 0.6 
Fan relay        6 A , p.f. 0.6 
Light relay     2.08 A , p.f. 0.3 
                      (fluorescent lamps 500 W) 

Accuracy  

Appliance sensor 0.5

 O

C 

Condenser /- 5

 O

C 

Resolution 

0.1

O

C 

Display 

15 mm 

– 7 segment – LED 

LED/display colour 

Green  

Sensor(s) 

Thermistor (NTC) 

Sensor wire length 

1 @ 1.5 mtr +/- 2.5 % 
1 @ 2.5 mtr +/- 2.5 % 
*Different lengths available upon request. 

Step down transformer 
 

230Vac/ 12 Vac 
120Vac/12Vac 
100Vac/12Vac (Japan only) 

Housing material 

Black Polycarbonate (Lexan-940) 

Maximum ambient operating temperature 

65

O

C. (55

 O

C in USA) 

IP rating 

Front 65 / Rear 10  

Motion detection range 

5 metres in front of detector 

Connections: Line voltage 
                      Low voltage 

Spade terminal 6.35 x 0.8 mm. 
Screw terminal connections 

 

 

 

 

APPROVALS 

 

 
 

CE 

European Low Voltage Directive  

VDE 

Verband der Elektrotechnik 

UL 

Underwriters Laboratories Inc. 

 
 

Please note that this manual is based upon EMS firmware version E46. Please see 
supplement sheet which states the differences between E46 and the older firmware 
version E43. 
 

 
 
 
 
 

Summary of Contents for EMS-55

Page 1: ......

Page 2: ... 10 Soft start 11 Minimum compressor rest time 11 12 Automatic defrost management 12 Voltage management 12 13 Managing the internal fans 13 Door open alarm 13 Diagnostics 14 Uninterrupted pull down function 14 Button commands 15 Display 16 17 Control settings 18 20 Statistical scroll 21 22 Products in the EMS range 23 Technical information 24 Contact information 25 Supplement 26 ...

Page 3: ...ber of service calls whilst saving on average 38 energy To ensure that the product is at the correct temperature the EMS will switch to operational mode 2 hours before the outlet opens this timing is adjustable Subsequently the control will switch to standby mode 1 hour after the outlet closes again this timing is adjustable Fig 1 Figure 1 shows a typical temperature graph During stand by period t...

Page 4: ... that the motion detection window has a clear and unrestricted view into the area in front of the cabinet CONNECTIONS All line voltage connections are made via 6 5 mm spade terminals and all low voltage connections are made via screw terminal blocks When installing the EMS it is recommended to use insulated connectors for all line voltage connections ...

Page 5: ...also be wired into the system This connection must go directly from the door switch to the terminals on the EMS see printed label on the control housing If a door switch is not used not recommended then a wire loop must be fitted to the door switch terminals on the EMS see below ...

Page 6: ...tact with By the time the air is returned to the evaporator it is an accurate representation of the average liquid temperature inside the cooler It is for this reason that the EMS appliance sensor should be located in the return air LOCATING THE CONDENSER SENSOR The EMS has a second temperature sensor for the discharge line which is used to avoid the refrigeration system overheating The compressor...

Page 7: ...emoved from the control fascia if attempted to do so the membrane will be permanently damaged and cannot be re used Membranes are available as spare parts if so required to order contact the manufacturer of the control direct OPENING THE CONTROL The EMS is ultrasonically welded together during its manufacture and thus any attempt to open the control will result in damage that cannot be rectified ...

Page 8: ...setting AF 1 will require 3 passers by or 1 door opening to register an active period Low traffic density setting AF 0 will require 1 passer by or 1 door opening to register an active period After this initial period the control will start to learn the opening pattern of the outlet For the next 24 hours or if AF 3 the control will remain in operational mode After this period and for the next six d...

Page 9: ...d view out of the front of the cooler For the detector to function correctly it must not be placed behind glass The EMS55 has a motion detector integrated into the fascia of the control and the EMS 55 R has a connection for an external detector RMD 55 EMS 55 with integrated motion detector EMS 55 R with external motion detector RMD 55 ...

Page 10: ...ERASING THE EMS MEMORY Half factory reset If required the learnt pattern can manually be erased by the using the following procedure Defrost button used to erase the matrix Disconnect the power to the control unplug the cooler push and hold the defrost button and restore the power Keep the button pressed until the display shows the temperature again release the button and the matrix will be erased...

Page 11: ...by starting the motors at intervals For example rather than 2 motors starting at the same time they can be started separately and this is exactly what the EMS does so as to minimise the start up current The delay between the start of the compressor and evaporator fans is approximately 20 seconds this value is not programmable MINIMUM COMPRESSOR REST TIME This feature is designed to avoid unnecessa...

Page 12: ...parameter Dt defrost termination temperature The combination of frequent defrosts and the mode change from operational to stand by will avoid the cooler icing up Keeping the evaporator of a cooler free of ice frost development enhances the heat exchange and maintains the efficiency of the refrigeration system If required a manual defrost can be performed by pressing the defrost button for 5 second...

Page 13: ...the internal evaporator fan s which gives the following benefits During periods when the compressor is off the fan s will cycle and not only will this save energy but will increase the life expectancy of the fan s themselves When the cooler door is opened the fan s are switched off even when the compressor is running This means that the cold air in the cooler will not be pushed out and no ambient ...

Page 14: ... display of the control To reset this alarm the UP button must be pressed THE REFRIGERATION SYSTEM FAILURE WARNING The most common failures in a refrigeration system are Blocked condenser Condenser fan failure Evaporator fan failure Refrigerant leak Blockage capillary systems only Electrical fault These failures can result in inefficiency or breakdown of the system If not rectified these can and e...

Page 15: ... each time the compressor is running Fan on indicator light This is a green LED that illuminates each time the internal fan s is running H T Alarm light This is a red LED that only illuminates when the temperature on the discharge line rises above the preset parameter temperature This overheating is often caused by a blocked condenser but can also be caused by a lack of ventilation to and from the...

Page 16: ...ill show the current appliance sensor temperature When the cooler is in stand by mode or if the door has been left open for a long period then the display will show three bars During normal operating mode press the SET button to access the Set Point This represents the compressor cut out temperature during operational mode The system is in freeze up protection mode which means that the temperature...

Page 17: ...estart the compressor until the voltage reaches a safe level again Supply High The line voltage has increased to a level that may cause damage to the compressor The EMS will not restart the compressor until the voltage reaches a safe level again A probe failure alarm indicates that the EMS has lost communication with the temperature sensor s This may be caused by a loose connection at the terminal...

Page 18: ...o C SD Stand by Differential 0 0 9 9 o C IPD Uninterrupted Pull Down Activation Temperature 0 80 o C DTT Activation Temperature for Freeze Up Protection Mode 10 50 o C DE Defrost Interval 1 199 Hours DD Defrost Duration 1 199 Minutes DT Defrost Termination 1 80 o C FCO Evaporator Fan Cycle On Time 1 30 Minutes FCF Evaporator Fan Cycle Off Time 1 30 Minutes FSP Fan Set Point 0 80 o C HT Blocked Con...

Page 19: ... desired parameter is shown Then alter the value by pressing up or down button Once the desired values are set allow the EMS to show the temperature again EMS 55 PARAMETERS Parameter Description SP This parameter sets the compressor cut out temperature during operational mode This is accessed by pressing the SET button and is not present in the parameter scroll US Upper set point Sets the upper li...

Page 20: ...ost cycles Dd Defrost duration This parameter sets the maximum time a defrost cycle can be Dt Defrost termination When the temperature in the cabinet rises above the value set in this parameter then the EMS will terminate the defrost cycle FCO Fan cycle ON time During the off cycle of the compressor the evaporator fan will cycle This parameter sets the fan ON time FCF Fan cycle OFF time As above b...

Page 21: ... and then its reading Each reading is displayed for approx 20 seconds to enable the user to write the values down After the control has completed the statistics scroll the display will automatically return to its standard duties Average temperature Lowest registered temperature Highest registered temperature Door opening counts Motion counts passers by Traffic density setting ...

Page 22: ...for 1000 to 1049 cnts 1 1 for 1 050 to 1 099 cnts 1 2 etc The maximum count therefore is 99 999 Motion counts passers by 7 days As door opening counts Traffic density setting 0 1 2 or 3 The system recognises low medium or high traffic but can also manually be set at one of these values This statistic shows the current automatically or manually chosen setting Compressor cycles 24 hours As per motio...

Page 23: ...23 THE PRODUCTS ...

Page 24: ... wire length 1 1 5 mtr 2 5 1 2 5 mtr 2 5 Different lengths available upon request Step down transformer 230Vac 12 Vac 120Vac 12Vac 100Vac 12Vac Japan only Housing material Black Polycarbonate Lexan 940 Maximum ambient operating temperature 65 O C 55 O C in USA IP rating Front 65 Rear 10 Motion detection range 5 metres in front of detector Connections Line voltage Low voltage Spade terminal 6 35 x ...

Page 25: ...tat co uk For North America Canada and Mexico The General Electric Company 215 Maple Street Salem VA 24153 U S A Contact Mr Rob Gamber Tel 1 540 378 3414 Mobile 1 540 915 1513 E mail Robert Gamber GE Com For Africa Elstat South Africa 5 Allenwells Street Discovery 1709 P O Box 6589 Ansfrere 1711 Discovery South Africa Contact Mr Dave Mitchell Tel 27 11 763 1623 Fax 27 11 763 1721 Mobile 27 82 4920...

Page 26: ...ential can be set in 0 1 degree increments 3 A new parameter PER perishable mode has been introduced which means the operational set point and differential are used during standby mode This parameter is now listed in the statistics scroll 4 The standby set point is now added to the operational set point to give the cut out temperature during standby 5 The HT alarm must now be reset manually by pre...

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