EWPC 907 temperature controller with dual output GENERAL DESCRIPTION setting, push the “SET” plus the “UP” (or The EWPC 907 is a temperature controller “DOWN”). with dual output, acting either indepen- The system will automatically return to its dently or dependently (2-stage); the prima- normal operating mode a few seconds af- WHAT IT IS ry output provides field selectable ON/OFF, ter the programming procedure is com- The EWPC 907 is a temperature PD or PID and SOFT START control. pleted or interrupted. controller with dual output, acting The front keypad of these controllers offers DESCRIPTION OF PARAMETERS either independently or dependently several alpha-numeric menu prompts to (2-stage); the primary output pro- configure the controller for each specific Any parameter which does not apply to a vides field selectable ON/OFF, PD application (see further). particular instrument version or configura- or PID and SOFT START control. The EWPC 907 is supplied in the popular tion is automatically removed from the pro- “32x74” ELIWELL housing. gramming menu. E.g.: a control for Thermocouple input will FRONT KEYPAD not offer parameters “Lci” and “Hci”. HOW IT IS MADE SET: pushed once the setpoint 1 value will d1: differential 1. • Housing: black ABS plastic, au- be displayed for 3 seconds (Led “I” blinks). Activated only in ON/OFF control mode. toestinguish. Pushed once again within 3 seconds the Must be set with negative (-) value for heat- • Dimensions: front 74x32 mm setpoint 2 value will be displayed (Led “II” ing applications. (2.913x1.260"), depth 67 mm blinks). The setpoint can be changed with d2: differential 2. (2.637") the “UP” or “DOWN” button. The switching differential (hysteresis) set- • Mounting: flush panel mount with UP: used to increase the setpoint value, as point 2 must be set with positive value mounting bracket well as the parameter when in program- (make on rise) or with negative value (make • Protection: the instrument front- ming. When held down for a few seconds, on fall). See parameter “HC2”. panel is waterproof IP65; an op- the change rate accelerates. LS1: Lower Set (limit) 1. tional snap-on cover can be DOWN: used to decrease the setpoint val- This is the lower limit below which the user supplied to provide additional pro- ue, as well as the parameter when in pro- cannot change the setpoint 1; normally set tection of the rear terminal block gramming. When held down for a few at the lowest value recommended for the • Connections: screw terminal seconds, the change rate accelerates. sensor. 2 block (2.5 mm ; one wire each ter- Led “I”: status light of output 1. LS2: Lower Set (limit) 2. minal only, in compliance with Blinks when in setpoint 1 display/change This is the lower limit below which the user VDE norms) mode or during programming. cannot change the setpoint 2; normally set • Display: 12.5 mm LED (0.50"). Led “II”: status light of output 2. at the lowest value recommended for the • Push buttons: located on front Blinks when in setpoint 2 display/change sensor. panel. mode. HS1: Higher Set (limit) 1. • Outputs: two (2) SPST relays 8(3)A Similar to “LS1”, however setting an upper 250V AC PARAMETER PROGRAMMING limit for the setpoint 1. • Auxiliary output: 12 Vdc/60 mA Programming is easily accessed by hold- HS2: Higher Set (limit) 2. (for transducer power supply, e.g. ing the “SET” button down for more than 4 Similar to “LS2”, however setting an upper humidity sensor, pressure trans- seconds; the first parameter is displayed limit for the setpoint 2. ducer, etc.) while the status light Led “I” remains blink- Pb: Proportional band. • Inputs (depending on model): ing during the programming period. This value, expressed in degrees, deter- PTC / RTD (Ni100, Pt100) / Other parameters are accessed with the mines the band-width around the setpoint TC (J, K) / 4…20 mA (Ri = 41 Ω) “UP” and “DOWN” button. With the “SET” within which the instrument provides pro- • Resolution: 1 °C (°F) or 0.1 °C (°F). button, the actual setting of each parame- portional control. See also “PROPOR- The right-most digit can also be ter is displayed. To change a parameter TIONAL CONTROL”. set to read-out in 0 or 5 only, or in all 10 digits • Accuracy: better than 0,5% of full scale • Power supply (depending on mod- el): 12 Vac/dc or 24 Vac/dc DEFAULT SETTINGS - STANDARD MODELS of “0” disables this function. dSt: dynamic Set time. Parameter Description Range Default Unit Time value between two successive dy- d1 differential 1 –1 / min –1 °C / °F namic setpoint increases. Lci: Lower current input. d2 differential 2 min / max 1 (C) / –1 (H) °C / °F Read-out corresponding to the “low end LS1 Lower Set limit 1 min / max min °C / °F scale” input signal of 4 mA; only for mod- LS2 Lower Set limit 2 min / max min °C / °F els with current input. Hci: Higher current input. HS1 Higher Set limit 1 min / max max °C / °F Read-out corresponding to the “high end HS2 Higher Set limit 2 min / max max °C / °F scale” of 20 mA; only for models with cur- Pb Proportional band 0.1 (1) / max 40 °C / °F rent input. CAL: CALibration. It Integral time 0 / 999 300 seconds This offers an adjustment up or down of dt derivative time 0 / 999 50 seconds the read-out, if needed. Factory set at “0”. Ft: Function type. Sr Sampling rate 1 / 10 3 seconds Control mode selection (only for output 1; rSt manual reSet min / max 0 °C / °F output 2 is always ON/OFF). Ar Anti reset wind-up band 0 / max 20 °C / °F on = ON/OFF; nr = not applicable; od output delay 0 / 500 0 seconds Pi = PID. Ct Cycle time 1 / 500 25 seconds PSE: Probe SElection. drb dynamic restart band 0 / max 20 °C / °F Input type (for RTD or Thermocouples only). dSi dynamic Set increment 0 / max 10 °C / °F RTD models: Ni = Ni100; Pt = Pt100. dSt dynamic Set time 1 / 999 120 seconds T/C models: Fe = TcJ; Cr = TcK. Lci Lower current input min / max min °C / °F OCO: Output COnnection. Setpoint dependency. Hci Higher current input min / max max °C / °F di = setpoint 2 dependent on setpoint 1 CAL CALibration min / max 0 °C / °F (for 2-stage control; Ft Function type on / Pi Pi flag in = setpoint 2 independent from setpoint 1. PSE Probe SElection Ni / Pt / Fe / Cr / / HC2: Heating / Cooling (output) 2. OCO Output COnnection di / in in flag Relay switch function output 2. HC2 Heating / Cooling output 2 H / C H flag H = Heating; C = Cooling. rP1 relay Protection 1 ro / rc ro flag rP1: relay Protection 1. rP2 relay Protection 2 ro / rc ro flag Determines the status of the relay in case LF1 Led Function 1 di / in di flag of sensor defect. Factory set at “ro”. ro = relay open; rc = relay closed LF2 Led Function 2 di / in di flag rP2: relay Protection 2. dP decimal Point on / oF oF flag Same as “rP1”. hdd half digit display n / y n flag LF1: Led Function 1. Determines whether the status light is ON tAb tAble of parameters / / / or OFF in relation to output 1. di = direct = light ON when output 1 is en- It: Integral time. This is the half-band (on either side of the ergized; The higher this setting, the “smoother” the setpoint) in which the integral action takes in = reverse = light OFF when output 1 is integral action. A setting of “0” completely place. The higher this setting, the stronger energized. eliminates the integral function and the integral action. Recommended initial LF2: Led Function 2. changes the controller from PID to PD setting: half of the value of parameter “Pb”. Same as “LF1”. (output 1). See also “PROPORTIONAL od: output delay. dP: decimal Point. CONTROL”. This provides a delay selection for the out- Choose whether the resolution is required dt: derivative time. puts in applications where noise may with or without decimal point. The effect of the derivative action is in di- cause brief erroneous signals from the oF = without decimal point; rect proportion to this time setting. sensor to the controller. Factory set at “0”. on = with decimal point. See also “PROPORTIONAL CONTROL”. Ct: Cycle time. NOTES: (a) the decimal point of models Sr: Sampling rate. This is the total time of one ONOFF cycle with current or voltage input is shifted: the Time between two successive read-outs, of the relay during the proportional action. actual value of parameters “Lci” and “Hci” for the computation of the derivative. A low See “PROPORTIONAL CONTROL”. must be multiplied by 10; (b) on all ver- setting increases the response time, but drb: dynamic restart band. sions, if a unit is changed from without also the sensitivity to noise. This is a “soft start” function; when the decimal point to with decimal point, all pa- Recommended setting is from 1 to 3. temperature goes beyond this “restart rameter values expressed in degrees will rSt: manual reSet. band” (on either side of the setpoint), an- automatically be divided by 10, including This allows the proportional band to be other soft start cycle is initiated. The value the setpoint (c) the decimal point selection moved up or down. This parameter is ex- of this parameter represents half of the to- is not available on models for thermocou- pressed in degrees and must be set at a tal band; see also “SOFT START”. ple input. value opposite and corresponding to the dSi: dynamic Set increment. hdd: half digit display. noticed error. This represents the dynamic increase of The right-most digit can be set to read-out Ar: Anti-reset wind-up band. the setpoint; see “SOFT START”. A setting in 0 or 5 only, or in all 10 digits. EWPC 907 7/2000 ing 2 CONNECTIONS and fasten with the U-bracket supplied with the unit. The ambient temperature around the in- strument should be kept between –5 and 65 °C (23…149 °F). Select a location which will not be subject 8 9 10 8 9 10 8 9 10 EWPC 907 to high humidity or condensation and allow some ventilation to provide cooling to the instrument. PTC Pt100 / Ni100 Pt100 / Ni100 3 wires 2 wires ELECTRICAL WIRING 1 2 3 4 6 7 8 9 10 The instrument is equipped with an internal 8 9 10 8 9 10 8 9 10 screw terminal block suitable for max 2 2.5 mm wiring (one wire each terminal + – load 1 load 2 only, in compliance with VDE norms). TcJ / TcK EWHS 31 4…20 mA input Make sure that the power supply corre- sponds with the rating shown on the in- POWER SUPPLY strument, i.e. 12 Vac/dc or 24 Vac/dc. Refer to the instrument label for the applic- able terminals to be used for the sensor cable; separate the wiring of the input sig- hdd = n : e.g. 070, 071, 072 etc. (if with- culation of the deviation values. nals from those of the power supply and out decimal point) or 70.0, 70.1, 70.2 etc. As a result: switched output wiring. (if with decimal point); a) an increase in the proportional band The relay output contacts are voltage free hdd = y : e.g. 070, 075, 080, etc. (if with- width reduces the temperature swing, but and independent; do not exceed the resis- out decimal point) or 70.0, 70.5, 71,0, etc. increases the shift in stable system tem- tive rating of 8 Amp at 250 Vac. For larger (if with decimal point). perature; loads, please use an external contactor or tAb: tAble of parameters. b) an excessive reduction of the propor- relay. This shows the configuration of the para- tional band width reduces deviation, but ERROR ANNOUNCIATION meters as set in the factory; can not be will also make the system less stable; modified (for factory identification and di- c) an increase in the derivative time re- Any sensor input defect will be displayed agnostic purposes only). duces temperature swings when the sys- as follows: “---” in case of shorted sensor; tem has become stable, but may cause “EEE” in case of sensor break, or sensor PROPORTIONAL CONTROL wider temperature swings and increased absence. The “EEE” error message also In the event that the factory set parameter deviation from setpoint; appears in the event of ovverrange or un- values in a PID temperature controller do d) an increase in the integral time reduces derrange of the system temperature. not give optimum results, the following the deviation between setpoint and system It is recommended to doublecheck the steps may be followed to enhance the op- value when system has become stable; sensor wiring before diagnosing a probe eration for each specific application: e) a weak integral action always has a tem- as defective. » set the controller for ON/OFF control perature deviation which, in general, can mode with parameter “Ft” (Ft = “on”); be eliminated by reducing the proportional TECHNICAL DATA » select a value for setpoint 1 which will band width and by increasing first of all the Housing: black ABS plastic, autoestin- keep the temperature swing within accept- derivative action, then the integral action. guish. able limits, for example 10% below the Dimensions: front 74x32 mm SOFT START (RAMP-TO-SETPOINT) normal operating temperature; (2.913x1.260"), depth 67 mm (2.637"). » set the switching differential (“d1”) at 3% The SOFT START feature is available on Mounting: flush panel mount with mount- of the setpoint 1 temperature; output 1 only. ing bracket. » start the system and wait for the temper- This function provides automatically a pro- Protection: the instrument frontpanel is ature swings to become constant; gressive (ramped) increase of the setpoint waterproof IP65; an optional snap-on cov- » check the process temperature (use a value starting from the value of Ta (ambient er can be supplied to provide additional data recorder if possible) at regular inter- temperature at start-up) up to the actually protection of the rear terminal block. vals; determine the time between two suc- selected setpoint temperature (see dia- Connections: screw terminal block 2 cessive temperature peaks (Tu) as well as gram on the right), thus eliminating any (2.5mm ; one wire each terminal only, in the total temperature swing (dT; see dia- possible temperature “overshooting”. compliance with VDE norms). gram on the right). The following parameters determine this Display: 12.5 mm LED (0.50"). Parameters “Pb”, “It”, “dt” and “Ct” can function: Push buttons: located on front panel. now be calculated as follows: - “drb”, half of the band width around set- Data storage: non-volatile EEPROM “Pb”=2xdT ; “It”=Tu/2 ; “dt”=Tu/8 ; point, outside of which the ramping of the memory. “Ct”=Tu/20. control point takes place; Operating temperature: –5…65 °C; Additional fine tuning of the above para- - “dSt”, the time between two successive (23…149 °F). meters may be tried, keeping in mind how- control point increases (this time is ex- Storage temperature: –30…75 °C; ever the following: pressed in seconds); (–22…167 °F). the “Proportional action” activates the out- - “dSi”, the value, in degrees, of each con- Outputs: two (2) SPST relays 8(3)A 250V put in direct proportion to the shift in stable trol point increase (a setting of “0” disables AC. system temperature ; this function). Auxiliary output: 12 Vdc/60 mA (for the “Derivative action” effects the output transducer power supply, e.g. humidity INSTALLATION depending on the speed of temperature sensor, pressure transducer, etc.). change; The instrument is designed for flush panel Inputs (depending on model): PTC / RTD the “Integral action” activates the output in mount. Prepare a 71x29 mm panel cut- (Ni100, Pt100) / Tc (J, K) / 4…20 mA proportion to the continuous integral cal- out; insert the instrument through the front (Ri = 41 Ω). 3 EWPC 907 7/2000 ing white blue gnd input 12 Vdc out Resolution: 1 °C (°F) or 0.1 °C (°F). The right-most digit can also be set to read-out in 0 or 5 only, or in all 10 digits. Accuracy: better than 0.5% of full scale. Power supply (depending on model): 12 Vac/dc ±15% or 24 Vac/dc ±15%. DISCLAIMER This manual and its contents remain the sole property of Invensys Climate Controls s.p.a., and shall not be reproduced or dis- tributed without authorization. Although great care has been exercised in the preparation of this document, Invensys Climate Controls s.p.a., its employees or its vendors, cannot accept any liability whatsoever connected with its use. Invensys Climate Controls s.p.a. reserves the right to make any changes or improve- ments without prior notice. Invensys Climate Controls s.p.a. via dell'Industria, 15 Zona Industriale Paludi 32010 Pieve d'Alpago (BL) ITALY Telephone +39 0437 986111 Facsimile +39 0437 986066 Email eliwell@invensysclimate.com Internet http:/www.climate-eu.invensys.com 7/2000 ing cod. 9FT40025 EWPC 907 7/2000 ing 4