EWPC 905 rel. 12/96 ing controllers with dual output GENERAL DESCRIPTION Led “I”: status light of output 1. The EWPC 905 (/T, /R, /P) is a series of mi- Led “II”: status light of output 2. croprocessor based and fully programma- PARAMETER PROGRAMMING ble process controllers for dual setpoint or WHAT IT IS Neutral Zone applications. Programming is easily accessed by hold- The EWPC 905 is a series of micro- In the Neutral Zone control mode it pro- ing the “SET” button down for more than 4 processor based and fully program- vides two relay outputs which are located seconds; the first parameter is displayed mable process controllers for dual at equal values above and below the set- while the status light Led “I” remains blink- setpoint or Neutral Zone applica- point selected. This value - the Neutral ing during the programming period. tions. Zone - is field adjustable. Other parameters are accessed with the Three different versions of this con- The front keypad of these controllers offers “UP” and “DOWN” button. With the “SET” troller are available: EWPC 905/T several alpha-numeric menu prompts to button, the actual setting of each parame- for Temperature, EWPC 905/R for configure the controller for each specific ter is displayed. To change a parameter Relative humidity and EWPC 905/P application (see further). setting, push the “SET” plus the “UP” (or for Pressure control. Three different versions of this controller “DOWN”). are available: EWPC 905/T for The system will automatically return to its Temperature, EWPC 905/R for Relative normal operating mode a few seconds af- humidity and EWPC 905/P for Pressure ter the programming procedure is com- HOW IT IS MADE control. The EWPC 905 (/T, /R, /P) is sup- pleted or interrupted. • Dimensions: front 74x32 mm plied in the popular “32x74” ELIWELL. (2.913x1.260"), depth 67 mm DESCRIPTION OF PARAMETERS FRONT KEYPAD (2.637") The following list of parameters is com- • Mounting: flush panel mount with SET (dual setpoint control mode): pushed plete. According to the selected control mounting bracket once the setpoint 1 value will be displayed mode (ON-OFF or Neutral Zone, see para- • Protection: the instrument front- for 5 seconds (Led “SET 1” is on). Pushed meter “Ft”), only the applicable parameters panel is waterproof IP65; an op- once again within 5 seconds the setpoint 2 will be shown and accessed. tional snap-on cover can be value will be displayed (Led “SET 2” is on). d1: differential setpoint 1. supplied to provide additional pro- The setpoint can be changed with the The switching differential (hysteresis) set- tection of the rear terminal block “UP” or “DOWN” button. point 1 can be set with positive value • Connections: screw terminal SET (Neutral Zone control mode): push (make on rise) or with negative value (make 2 block (2.5 mm ; one wire each ter- and release to display the setpoint for 5 on fall). minal only, in compliance with seconds. During this period, the Led “SET See parameters “HC1” and “HC2”. VDE norms) 1” is on and the setpoint can be changed d2: differential setpoint 2. • Display: 12.5 mm LED (0.50") with the “UP” or “DOWN” button only. Same as “d1”. • Push buttons: located on front UP: used to increase the setpoint value, as db: dead band (or Neutral Zone). panel well as the parameter when in program- This is the span above and below the set- • Outputs: two (2) SPST relays 8(3)A ming. When held down for a few seconds, point beyond which relay 1, respectively 250V AC the change rate accelerates. relay 2 are energized; once an output is • Auxiliary output: 12 Vdc/60 mA DOWN: same functions except to de- energized, the output remains ON until (for transducer power supply, e.g. crease a value. setpoint is reached. humidity sensor, pressure trans- Led “SET 1”: status light of Setpoint 1. On LS1: Lower Set 1. ducer, etc.) during display/change Setpoint 1 or blink- This is the lower limit below which the user • Inputs (depending on model): ing during programming. cannot change the setpoint 1; normally set PTC / RTD (Ni100, Pt100) / Led “SET 2”: status light of Setpoint 2. On at the lowest value recommended for the TC (J, K) / 4…20 mA (Ri = 41 Ω) for during display/change Setpoint 2. sensor. EWPC 905/T; EWHS 28/31 for EWPC 905/R and EWPA 007/030 for EWPC 905/P • 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 mod- el): 12 Vac/dc or 24 Vac/dc DEFAULT SETTINGS - STANDARD MODELS in = reverse = light OFF when output 1 is energized. Parameter Description ON - OFF Dead Band Unit LF2: Led Function 2. d1 differential set 1 1 (C) / –1 (H) / °C / °F Same as “LF1”. dP: decimal Point. d2 differential set 2 1 (C) / –1 (H) / °C / °F Choose whether the resolution is required db dead band / 1 °C / °F with or without decimal point. LS1 Low Set 1 min min °C / °F oF = without decimal point; LS2 on = with decimal point. Low Set 2 min min °C / °F NOTES: (a) the decimal point of models HS1 High Set 1 max max °C / °F with current or voltage input is shifted: the HS2 High Set 2 max max °C / °F actual value of parameters “Lci” and “Hci” od output delay 0 0 seconds must be multiplied by 10; (b) on all ver- sions, if a unit is changed from without Lci Low current input 20 (%R.H.) 20 (%R.H.) various decimal point to with decimal point, all pa- Hci High current input 100 (%R.H.) 100 (%R.H.) various rameter values expressed in degrees will CAL CALibration 0 0 °C / °F automatically be divided by 10, including Ft Function type on nr flag the setpoint !! (c) the decimal point selec- tion is not available on models for thermo- PSE Probe SElection Ni / Pt / Fe / Cr Ni / Pt / Fe / Cr flag couple input. OCO Output COnnection in in flag hdd: half digit display. HC1 Heating / Cooling output 1 H / C / flag The right-most digit can be set to read-out in 0 or 5 only, or in all 10 digits. HC2 Heating / Cooling output 2 H / C / flag hdd = n: e.g. 070, 071, 072 etc. (if without rP1 relay Protection 1 ro ro flag decimal point) or 70.0, 70.1, 70.2 etc. (if rP2 relay Protection 2 ro ro flag with decimal point); hdd = y: e.g. 070, 075, 080, etc. (if without LF1 Led Function 1 di di flag decimal point) or 70.0, 70.5, 80.0, etc. (if LF2 Led Function 2 di di flag with decimal point). dP decimal Point on / oF oF flag Useful when measuring values varying hdd half digit display n n flag rapidly (e.g. %R.H.). tAb: tAble of parameters. tAb tAble of parameters / / flag This shows the configuration of the para- meters as set in the factory; can not be modified (for factory identification and di- LS2: Lower Set 2. on = ON-OFF; nr = neutral zone. agnostic purposes only). This is the lower limit below which the user PSE: Probe SElection. cannot change the setpoint 2; normally set Input type (for RTD or Thermocouples NEUTRAL ZONE (DEAD BAND) at the lowest value recommended for the only). The Neutral Zone (Dead Band) control is sensor. RTD models: Ni = Ni100; Pt = Pt100. obtained by setting to “nr” the parameter HS1: Higher Set 1. T/C models: FE = TcJ; Cr = TcK. “Ft”. Similar to LS1, however setting an upper OCO: Output COnnection. This band width is always such that the limit for the setpoint 1. Setpoint dependency. setpoint is at midpoint. Both output relays HS2: Higher Set 2. di = setpoint 2 dependent on set 1 (for 2- are OFF as long as the temperature re- Similar to LS2, however setting an upper stage control; mains within these two limits. limit for the setpoint 2. in = setpoint 2 independent from set 1. The total value of the dead band is twice od: output delay. HC1: Heating/Cooling output 1. the value set with parameter “db”. This provides a delay selection for the out- Relay switch function output 1. As soon as the process temperature ex- puts in applications where noise may H = heating (humidification; reverse ac- ceeds the upper band limit or falls below cause brief erroneous signals from the tion); the lower band limit, the corresponding sensor to the controller. C = cooling (dehumidification; direct ac- output relay will be energized and stay on Factory set at “0”. tion). until the temperature comes back to the Lci: Lower current input. HC2: Heating/Cooling output . setpoint. For EWPC 905/R, EWPC 905/P and Relay switch function output 2. EWPC 905/T with current input only. H = heating (humidification; reverse ac- INSTALLATION Read-out corresponding to 4 mA input sig- tion); The instrument is designed for flush panel nal (factory set at 20 %R.H for EWPC C = cooling (dehumidification; direct ac- mount. Prepare a 29x71 mm panel cut- 905/R). tion). out; insert the instrument through the front Hci: Higher current input. rP1: relay Protection 1. and fasten with the U-bracket supplied For EWPC 905/R, EWPC 905/P and Determines the status of the relay in case with the unit. EWPC 905/T with current input only. of sensor defect. The ambient temperature around the in- Read-out corresponding to 20 mA input Factory set at “ro”. strument should be kept between –5 and signal (factory set at 100 %R.H for EWPC ro = relay open; rc = relay closed 65 °C (23…149 °F). 905/R). rP2: relay Protection 2. Select a location which will not be subject CAL: CALibration. Same as “rP1”. to high humidity or condensation and allow This offers an adjustment up or down of LF1: Led Function 1. some ventilation to provide cooling to the the read-out, if needed. Determines whether the status light “I” is instrument. Factory set at “0”. ON or OFF in relation to output 1. ELECTRICAL WIRING Ft: Function type. di = direct = light ON when output 1 is en- Control mode selection (output 1). ergized; The instrument is equipped with an internal EWPC 905 12/96 ing 2 CONNECTIONS Connections: screw terminal block 2 (2.5mm ; one wire each terminal only, in compliance with VDE norms). 8 9 10 8 9 10 8 9 10 Display: 12.5 mm LED (0.50"). EWPC 905/T Push buttons: located on front panel. Data storage: non-volatile EEPROM PTC Pt100 / Ni100 Pt100 / Ni100 memory. 3 wires 2 wires Operating temperature: –5…65 °C; 1 2 3 4 6 7 8 9 10 (23…149 °F). 8 9 10 8 9 10 8 9 10 Storage temperature: –30…75 °C; (–22…167 °F). + – load 1 load 2 Outputs: two (2) SPST relays 8(3) 250V TcJ / TcK EWHS 31 4…20 mA input AC. Auxiliary output: 12 Vdc/60 mA (for POWER SUPPLY transducer power supply, e.g. humidity sensor, pressure transducer, etc.). Inputs (depending on model): PTC / RTD (Ni100, Pt100) / TC (J, K) / 4…20 mA 8 9 10 8 9 10 EWPC 905/R (Ri = 41 Ω) for EWPC 905/T; EWHS 28/31 for EWPC 905/R and EWPA 007/030 for EWPC 905/P. EWHS 28 EWHS 31 Resolution: 1 °C (°F) or 0,1 °C (°F). The right-most digit can also be set to read-out 1 2 3 4 6 7 8 9 10 8 9 10 in 0 or 5 only, or in all 10 digits. Accuracy: better than 0.5% of full scale. Power supply (dep. on model): 12 Vac/dc load 1 load 2 4…20 mA input ±15% or 24 Vac/dc ±15%. POWER SUPPLY Eliwell S.p.A. via dell’Artigianato, 65 Zona Industriale 8 9 10 EWPC 905/P 32010 Pieve d’Alpago (BL) Italy EWPA 007 Telephone +39 (0)437 986111 EWPA 030 Facsimile +39 (0)437 989066 1 2 3 4 6 7 8 9 10 8 9 10 A Siebe Group Company load 1 load 2 4…20 mA input POWER SUPPLY ERROR ANNOUNCIATION screw terminal block suitable for max. 2 2.5 mm wiring (one wire each terminal Any sensor input defect will be displayed only, in compliance with VDE norms). as follows: “- - -” in case of shorted sensor; Make sure that the power supply corre- “EEE” in case of sensor break, or sensor sponds with the rating shown on the in- absence. The “EEE” error message also strument, i.e. 12 Vac/dc (EWPC 905/T and appears in the event of ovverrange or un- EWPC 905/R in this version are recognized derrange of the system temperature. according to VDE and UL) or 24 Vac/dc. It is recommended to doublecheck the Refer to the instrument label for the applic- sensor wiring before diagnosing a probe able terminals to be used for the sensor as defective. cable. If an ELIWELL humidity or pressure TECHNICAL DATA sensor is used (EWPC 905/R or EWPC 905/P) keep in mind that it can be pow- Housing: black ABS plastic, autoestin- ered by the controller (see wiring diagram). guish. Separate the wiring of the input signals Dimensions: front 74x32 mm from those of the power supply and (2.913x1.260"), depth 67 mm (2.637"). switched output wiring. Mounting: flush panel mount with mount- The relay output contacts are voltage free ing bracket. and independent; do not exceed the resis- Protection: the instrument frontpanel is tive rating of 8 Amp at 250 Vac. For larger waterproof IP65; an optional snap-on cov- loads, please use an external contactor or er can be supplied to provide additional relay. protection of the rear terminal block. 3 EWPC 905 12/96 ing gnd gnd input white input brown brown 12 Vdc out 12 Vdc out blue white white brown blue red gnd input 12 Vdc out