HONEYWELL MicroniK 1 R742B TEMPERATURE CONTROLLER GENERAL PRODUCT DATA The temperature controller R742B uses direct digital control technology to provide a more accurate and efficient operation of heating, ventilation and air conditioning systems. Parameters are preset for plug and play installation. It allows the use of different control strategies for optimum system performance. The modern design with an easy to operate user interface and LC-display allows complete flexibility of control system design, accurate parameter setting and display of actual temperature values, setpoints and control output. The controller performs proportional plus integral or proportional control only and covers all space, supply air or water flow applications within the specified ranges...5 C or...13 C. Standard Balco 5 or Pt 1 temperature sensor can be used. FEATURES Fig. 1. Temperature controller X1 X2 X3 min sec K C % rh 1. W 1 9. Cal 2. W 2 1. Dir / Rev 3. W lim 11. W comp 4. Xp 1 12. Aut Wi 5. Xp 2 13. Aut Su 6. tr 14. W cas 7. Pl lim 15. R cas 8. Y start 16. tr cas Microcontroller design based on modern digital technology User interface with LC-display and 3 push-buttons Two control operating ranges...5 C or...13 C Selectable proportional plus integral (PI) or proportional (P) control only Inputs for Balco 5 or Pt 1 temperature sensors Common sensor for multiple controllers Pre-programmed control parameters Digital parameter setting Optional remote setpoint adjustment or occupied/unoccupied setpoint operation Controller output signal override and position limitation Control output monitoring Selectable direct/reverse acting output Space/supply limit or cascade control Summer/winter compensation 24Vac power supply Design in accordance with CE and DIN standards Y Fig. 2. LC-display This product meets the requirements of CE ENC-628 298R1-MA
R742B TEMPERATURE CONTROLLER SPECIFICATIONS General Housing Aluminium frame with connection terminal and front panel according to DIN 41494 and 437 Electronic 8-bit microcontroller, 1-bit A/D-converter, 8-bit D/Aconverter, EEPROM and LC-display Standards in accordance with CE Input temperature All temperature sensors -2...+13 C range Power supply Voltage 24Vac +1/-15%, 5/6Hz Power consumption 3VA Input Main temperature sensor (T1) Balco 5, 5Ω at 23.3 C or Pt 1, 1Ω at C Optional inputs Limitation temperature sensor (T2) Balco 5, 5Ω at 23.3 C or Compensation temperature sensor (T3) Pt 1, 1Ω at C Setpoint potentiometer (W ext) 1kΩ for...5 C or...13 C Output limitation potentiometer (POS) 1kΩ to +15Vdc for 2...6Vdc Y-limitation or to -15Vdc for 6...1Vdc Y-limitation Occupied / unoccupied switch (S) potential free contact: > 4kΩ, < 1Ω Override switch (OR) Y-output > 1Vdc with OR = +15Vdc Y-output < 2Vdc with OR = -15Vdc Y-output = control signal with OR = Outputs control range 2...1Vdc Y full range.5...12vdc max. load 2mA X w... ±5Vdc, 2mV/K, max..1ma X wi... ±1.25Vdc, 5mV/K, max..1ma Control parameters No. Description Abbr. Specifications Default parameter (...5 C or...13 C) (1) Main setpoint W1 OFF,...5 C or...13 C 21 C or 7 C (2) Unoccupied main setpoint W2...5 C or...13 C 18 C or 5 C (3) Limit setpoint (W min or W max)w lim 5...3 C (W min) or 3...13 C (W max) 16 C or 9 C (4) Throttling range X p1 1...4K for P and P+I control 2K or 1K (5) Throttling range X p2 1...4K 1K or 2K (6) Reset time tr OFF, 2sec...2min OFF (7) Integral control limitation PI lim... ±5K ±25K (8) Start point Y start ±2K K (9) Control point calibration Cal ±5K K (1) Direct/reverse acting Dir/Rev Direct or reverse Direct output (11) Compensation change W comp -5...+4 C +2 C over point (12) Winter compensation Aut Wi ±35% % authority (13) Summer compensation Aut Su ±1% % authority (14) Cascade main setpoint W cas OFF,...5 C or...13 C OFF (15) Reset span adjustment R cas... ±4K K (16) Cascade reset time tr cas OFF, 2sec...2min OFF Environmental Ambient temperature...5 C limits Storage temperature -25...+7 C Relative humidity 5...95%rh non condensing Mounting and Mounting Front and back of panel, rack or wall connections Connection terminal Screw type max. 2 x 1.5mm 2 Protection Foreign objects IP3 in accordance with EN6529 Protection against contact EN673-1 class II ENC-628 298R1-MA 2
R742B TEMPERATURE CONTROLLER OPERATION The controller can be used for space/supply limit operation or for cascade control operation. NORMAL CONTROL The controller compares the actual temperature value measured by the main sensor (T1) with the programmed (W1or W2) or calculated (W) setpoint. It generates a proportional (X w) and proportional plus integral (X wi) deviation signal. Depending on the deviation signal, the control output (Y) value is calculated and converted to a continuous either direct (2...1Vdc) or reverse (1...2Vdc) acting signal, as selected by the Dir/Rev control parameter. The Throttling range setting (X p1) controls the output span. LIMITATION CONTROL (W lim and Xp2 ) The controller offers limitation control which is performed by comparing the deviation signals of the main and limit control loops. Depending on the selected limit function the lowest (low limit) or highest (high limit) deviation signal is selected and fed into the output stage to control the damper or valve actuator. High limitation control will be performed if the...135c control range is selected. Low limitation control will be performed if the...55c control range is selected. During limitation control, the throttling range X p2 will be used. Limitation control will be active only if a temperature signal T2 is supplied. CASCADE CONTROL (W cas, R cas and tr cas ) Y[V] 12 1 REV DIR The cascade control uses two control loops, master and submaster to maintain the master setpoint (W1 or W2). T1[5C] MASTER 6 2.5 X w[v] Xp W1 W1 Y start T1[5C] 1 Xp The startpoint Y start determines in Kelvin the midrange shift of output (Y) from main setpoint (W1 or W2). T2[❺C] W lim SUBMASTER for...13 C range PI-CONTROL AND INTEGRAL LIMITATION (tr and PIlim) The controller is configurable either with a proportional (P) or a proportional plus integral (PI) action. R cas W cas W lim for...5 C range X w[v] 1 Internal deviation signal 1 X wi[v] (P) tr t[min] t[min] The proportional part of the PI-control is such, that on sudden change in the temperature deviation (X w), the proportional correction signal from the controller follows immediately. As long as there is still a deviation, the integral part of the controller repositions the actuator, governed by the adjustable reset time (tr), until the temperature is back at the actual setpoint (W). If the deviation signal X wi exceeds the integral limitation PI lim integral action is disabled. At zero room temperature deviation the discharge temperature (T2) is controlled by the programmed setpoint (W cas).if the room temperature deviates, the submaster setpoint (W cas) is altered. The discharge temperature sensor (T2) detects any variations and reacts immediately to correct the deviation before the variation can have an effect on the room temperature (T1). The reset span adjustment (R cas) determines the degrees of reset effect. The reset time of the PI-control for the submaster can be adjusted by the control parameter tr cas (see description of tr in section PI-control and integral limitation), the throttling range X p2 will be used. The limit setpoint (W lim) is used as low limit if...5 C and as high limit if...13 C is selected. 3 ENC-628 298R1-MA
R742B TEMPERATURE CONTROLLER SUMMER/WINTER COMPENSATION (Wcomp, Aut Su and Aut Wi) If the compensation temperature (T3) is above/below the compensation change over point (W comp) summer/winter compensation will be performed. W[❺C] W1 Aut Wi W comp Aut Su T3[❺C] The compensation influences the main setpoint (W1 or W2). The authority of summer/winter compensation can be enabled with Aut Su and Aut Wi control parameters. REMOTE SETPOINT ADJUSTMENT (W ext ) The main setpoint can be adjusted by the push buttons on the control panel or via an external 1kΩ potentiometer which is connected to the setpoint input (W ext). The remote setpoint is enabled by setting the control parameter W1 to OFF. MIN/MAX OUTPUT LIMITATION (POS) The output signal (Y) can be limited to a max. or min. position via an external 1kΩ potentiometer which is connected from POS to +15Vdc or -15Vdc. The adjustment range is described in the specifications. CONTROLLER OUTPUT SIGNAL OVERRIDE (OR) The override input (OR) can be controlled via an external relay or switch which is connected to +15Vdc or -15Vdc The output signal (Y) will be overridden by a max. or min. output signal if the override input (OR) is switched to +15Vdc or -15Vdc CALIBRATION OF T1 (Cal) In cases of an offset as a result of long leads the main temperature sensor input (T1) can be adjusted by the control parameter Cal. WIRING From controller Type of length max. to... wires 1m 15m All input and output devices local standard 1.mm 2 1.5mm 2 OCCUPIED / UNOCCUPIED MAIN SETPOINT (W1, W2) For occcupied / unoccupied operation the controller can be switched between the main setpoints W1 and W2( e.g. unoccupied setpoint ). Instead of the external remote setpoint potentiometer a potential free contact can be connected to terminals 4 & 6. If the contact is the controller will use the W2 setpoint to calculate the actual setpoint(w). An contact will switch the controller to normal control and the setpoint W1 is maintained. The unoccupied main setpoint W2 function is enabled if W1 control parameter setting W1 OFF. ENC-628 298R1-MA 4
R742B TEMPERATURE CONTROLLER S 1k 2mV/ K +15 V -15 V 5mV/ K 5/13 o C o C T1 2 4 +15 V T2 6 W ext 8 T3 1 X w 12 +15 V POS 14-15 V OR 16 Y 18 2 X wi 22 24 1 3 5 7 9 11 13 15 17 19 21 23 25 CAUTION T1 T2 T3 1k +15 V Y min = 2... 6 V -15 V Y max = 6...1 V +15 V Y = 1 V -15 V Y = 2 V Outputs are not insulated from power supply Connect 24Vac power supply in proper phase = V Jumper 1) State Description W11 2) W41 2) W42 2) W43 2) W44 W44 W41 W42 W43 W11 Control range to 5❺C Control range to 13❺C T1 supplied by this controller T1 supplied by another controller 3) T2 supplied by this controller T2 supplied by another controller T3 supplied by this controller T3 supplied by another controller All inputs Pt 1 All inputs Balco 5 1) Default jumper position = 2) Jumper W41, W42 or W43 has only to be cut (), if the sensor input T1, T2 or T3 is fed by the internal power supply of another control module or another sensor input of the same controller. This disconnects the sensor from the internal power supply. 3) When T1 is also used as limit sensor, link terminals 1 and 5. Fig. 3. Electrical connections Fig. 4. Jumper coding H honeywell 23,5 +,5 7,5 +,5 44 +,5 91 +,5 132 + SEL - MicroniK 1 122 +,5 138 + 1 13 141 47 4,5/M4 23,5 47 44 47 Note: All dimensions in mm Fig. 5. Dimensions and panel cut out 5 ENC-628 298R1-MA
R742B TEMPERATURE CONTROLLER HONEYWELL Honeywell Regelsysteme GmbH Honeywellstr. 2-6 D-63477 Maintal Tel. ( 61 81) 41-1 Fax ( 61 81) 41-4 Subject to change without notice. Printed in Germany. ENC-628 298R1-MA Helping You Control Your World Manufacturing location is certified according to DIN EN ISO 91