Rittal SK 3296100 Assembly Instructions Manual
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Rittal SK 3296100 Assembly Instructions Manual

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  • Page 2 Enclosure cooling units are designed and built to dissipate heat from enclosures, by cooling the air inside the enclosure and protecting temperature sensitive components. Enclosure cooling units are particularly suitable for the temperature range of +40ºC to +55ºC. 2. Technical Data : SK 3296100 SK 3272100 SK 3290100 SK 3280100...
  • Page 3 3. Assembly Make 2 cut-outs and screw holes in the top of the enclosure in accordance with fig. 3.1. Prior to mounting, ensure that: • the site for the enclosure, and hence the arrangement of the cooling unit, is selected so as to ensure good ventilation;...
  • Page 4 Figure 3.1 Mounting Cut-out SK 3296...3272100 Figure 3.2 Roof plate stiffening...
  • Page 5 Figure 3.3 Mounting 4. Electrical Connection The connected voltage and frequency must correspond to the values stated on the name plate. The cooling unit must be connected to the mains via an isolating device, which ensures at least 3 mm contact opening when switched off.
  • Page 6 5.1.1 Temperature Setting at the Controller Set the desired temperature. Setting range +20ºC to +55ºC. To avoid cyclic operation of the compressor, it is imperative that the set switching difference of 5 K is not changed and does not deviate to a lower value. 5.2 Control by Microcontroller Version..500 After electrical connection the internal fan turns on and circulates the enclosure air.
  • Page 7 5.2.1 Operation of the Microcontroller The display terminal H1 consists of a 3 position 7-segment display which indicates the enclosure internal temperature in ºC or ºF (changeable, see section 5.2.2) as well as any fault codes. The actual enclosure internal temperature is constantly displayed. If a fault occurs then the fault number is indicated in the left position.
  • Page 8 5.2.3 Fault Signal Facility All faults on the cooling unit are registered and indicated by H1 as a fault number. The display is by means of the left-hand number. The display cycles through all pending fault messages in a 2 second cycle, starting with the internal temperature of the enclosure.
  • Page 9 5.2.3.3 Door Limit Switch S 2 (supplied by customer) Where a door limit switch is used and the enclosure door is open (contact is closed when door is open), the cooling unit (fans and condenser) will switch off after approx. 10 s, thereby avoiding an increase in condensation while the door is open.
  • Page 10 Max. loading of the outputs: 30 V/10 mA, direct current Connection: screened 15-core control cable The possibility exists to access this information over the PLC interface (level 8, table 5.1 or fig. 5.1). a) Standard mode (Level 8="0") Communication of the enclosure internal temperature and of the fault messages is made successively in 2 s cycle.
  • Page 11 Enclosure internal temperature: Transmission with 2 digits in BCD format: System messages: The messages are transferred by means of identification (4 bit) and a fault number (1 digit BCD). The identification is structured as follows: In the event of a fault XXXX (BCD), the identification is transmitted cyclically. This information can be used to store the fault message in the PLC.
  • Page 12 This identification is transferred once, as soon as the fault with the number XXXX/BCD has been rectified. This information can be used to delete the fault messae in the PLC. Evaluation of the interface signals in the PLC: Messages: If bit 1 and bit 3 of the input byte have a 1 signal, the transmitted information is a system messae. In this case, the meaning of bit 0 is either the information "store fault message"...
  • Page 13 6.1 Operation of the Cooling Unit Fig. 6.1 Cooling Circuit When a coolant compressor is put into operation, the coolant vapor evaporates from the evaporator. The heat required for the evaporation of the coolant is drawn from the evaporator environment (internal circuit of the enclosure), causing it to cool down. The heat fed to the coolant in the evaporator is its environment (assisted by fans), making the coolant once more liquid due to the condensation which takes place.
  • Page 14 6.2 Safety Equipment The cooling circuit of the cooling unit embodies a component tested high-pressure monitor to VBG 20.7.1 which is set to maximum operating pressure and operates via an automatic reset device at recurring pressure drop. Temperature and low-pressure monitoring will prevent the evaporator from icing up.
  • Page 15 Transport attitude: The cooling units must always be transported upright. Waste disposal: The closed cooling circuit contains coolant and oil which must be correctly disposed of for the protection of the environment. The disposal can be carried out at Rittal-Werk. Technical modifications reserved.
  • Page 16 9. Fault Indication and Fault Analysis: Fault No. Nature of Fault Cause Remedy Cooling output too low (lack of Temperature inside the Check cooling output coolant) enclosure too high Carry out cooling service Consequential fault or faults 2-7 Compressor overloaded (internal Unit will switch on Compressor winding protection)
  • Page 17 10. Spares List Description 3290100 3290500 3280100 3296100 3296500 3272100 1 Hardware bag 266021 270077 266021 264983 270092 264983 2 Housing 270079 270079 270079 265004 270094 270343 3 Louvred grille 1 225913 225913 225913 226200 226200 226200 4 Louvred grille 2 225914 225914 225914...
  • Page 18 SK 3296100/3296500/3272100 SK 3290100/3290500/3280100...
  • Page 19 Wiring Diagram Microcontroller A1=Power PCB A2=Display Terminal B1=Temperature sensor, internal temperature B2=Temperature sensor, risk of icing B3=Temperature sensor, external 1 B4=Temperature sensor, external 2 C1-C3=Operating capacitors F1=Thermostat F2=Pressostat K1=Relay collective fault M1=Compressor M2=Condenser fan M3=Condenser fan M4=Evaporator fan S2=Door limit switch (without door operated switch terminal 1, 2 open) T1=Transformer (SK 3272100/3280100 and special units) Electrical Connection by Customer: X2=PLC interface (Sub-D-socket, 15-pole)
  • Page 20 Wiring Diagram:...
  • Page 21 Detailed Wiring Diagram:...
  • Page 22 Performance Diagram =Cooling output =Condenser entry =Evaporator entry Performance Input Diagram =Performance entry...
  • Page 23 Diagram 5.1: Programming Rittal Corporation - One Rittal Place - Springfield - Ohio - 45504 Toll Free : 1-800-637-4425 - Email : rittal@rittal-corp.com - Internet : www.rittal-corp.com - Tech. Sup. : 1-800-637-4425 8/04...

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