SCR Power Controls - PaynEng.com

1 MODEL 18D/E Description:Phase-Angle SCRP ower Controls Product Range:120 to 600 VAC,Single- or Three-Phase, 10 to1200 amps Application:Constant ResistanceLoadsFEATURES All Solid State Construction Exclusive 2 Millisecond Fusesfor Short-Circuit Protection Exclusive VboClamping Tran-sient Voltage Protection ExclusiveFull Rated Operation in50oC (122oF) Ambients WithoutFans Through 450 Amps ExclusiveProprietary Heatsinks Silent, Arcless Switching Infinitely Variable Voltage control Open-Chassis or Enclosed Full Range of control Optionsand AccessoriesTYPICAL APPLICATIONS Replace Variable Transformers Electric Furnaces and Ovens Heat Sealing and Packaging Ink Drying Foam Cutting Plastic Extruding and Molding Process Heating Food Processing Ovens AutoclavesModel 18D/E SCR Controls provideinfinitely variable control of sin-gle-phase (18D)

2 And three-phase(18E) voltages to resistive heat-ing elements. These units are solidstate replacements for variabletransformers, saturable core reac-tors, electromechanical contactors,and mercury relays. Power semi-conductors replace contacts andbrushes to switch electric powerwithout moving parts, and, when op-erated within stated ratings for cur-rent, voltage, and temperature,have no known MTBF or lifeexpectency ADVANCEDTECHNOLOGY:Three Pillars Of Protection18D/E SCR Controls incorporateex-clusivedesign features to protectthe Power semiconductor compo-nents against damage.

3 1> Unique VboClamping providesunmatched protection for powersemiconductors against transientvoltage spikes common on indus-trial Power > 2 millisecond fuses protectsemiconductors against short-cir-cuit faults. Payne Engineering SCRcontrols are the only Power controlsin the industry equipped with factorytested and approved fuses coordi-nated with Power > Proprietary heatsinks are engi-neered in-house coordinating finiteelement analysis (FEA) with on-sitelab tests. Payne Engineering SCRcontrols operate at 50oC (122oF)ambient temperatures with no FLEXIBILITYS tandard configuration of all 18D/Econtrols is for manual control via a270oturn potentiometer (included).

4 Standard options allow for open- orclosed-loop automatic control in re-sponse to an analog control signalfrom a temperature controller, PLCI/O module, or other externalsource. Other options allow controlsto be configured for the specific re-quirements of each Circuit:inverse-parallelsemiconductors selected for VboClamping transient protection, withparallel R-C circuit for dv/dt protec-tion. Current-clamping 2-millisec-ond Power fuses in series withpower semiconductors provideshort-circuit Circuit:all solid state cir-cuitry supplies synchronized gatepulses to each thyristor via isolatingpulse Frequency:50, 60 Hzstan-dard.

5 Other frequencies avail-able as special order (consult fac-tory).Output Voltage:0 to nominal inputvoltage, infinitely to Loss:approximately 1-2watts/ampere/switched Drop Across Power Circuitat 100% Output:1-2 volts maximumper switched Voltage:(isolation betweenpower circuit, control circuit andground) greater than 2 Input:manual control via75K Ohm, 2 watt potentiometer withintegral On/Off switch and indicatingdial plate Power :5 watts from 12 VA isolation controltransformer (except for 120 VAC18D units in 10, 20, 30 amp sizes).

6 Fuse Protection:2 millisecond I2tfuses are factory tested and coordi-nated with all Power semiconduc-tors, considering:a. fuse element melt time tmelt;b. peak melt current Imelt;c. arc quench time tarc;d. peak arc current Voltage Protection:volt-age breakover (Vbo) protection withR-C filters for dv/dt Temperature Range:-10 to+50oC (122oF).Model 18D/ESCR Power ControlsRt. 29 Scott Depot WV 25560-0070 APPLICATION ASSISTANCE - 304/757-735424 HOUR FAX - 304/757-7305 Terminal Connections:10-30 ampuse Bakelite or thermoplasticblocks; 50 amps and larger usescrew lugs or stud OPTIONSRMS Voltage Limit:circuit-boardmounted variable-resistance trim-mer in series with manual potenti-ometer.

7 Allows the user to limitoutput voltage to connected load atmaximum potentiometer applicable to units controlled byexternal analog control :circuitry integral tomain control board that allows out-put voltage to be controlled by exter-nal analog signal (milliamps or ) in closed-loop system. Volt-age output from Power control isproportional to analog signal SPAN and GAIN trimmersprovide for field calibration/adjust-ment of signal response Current Limit:output voltagefrom control is varied to keep loadcurrent at or below adjustable current Output Voltage Regulation:output voltage variations are limitedto 1% for input variations up to 30%.

8 Maximum regulated outputvoltage may not be greater than75% of minimum input Chassis Construction:electrically isolated chassis avail-able through 80 amp size. Note: 18 Dcontrols with i suffix in model num-ber include isolated chassis con-struction as standard control : control acceptsinput from temperature-sensingthermistor probe, and automaticallyadjusts Power control output voltageto maintain load temperature at levelselected on temperature set potenti-ometer in closed-loop controlscheme. Available temperatureranges: 0-90oC and probe, 3 ft.

9 Of cable, andset-point potentiometer :output voltage to load isramped from 0 to potentiometer-se-lected level over 1/2 second afteractuation to reduce inrush upon closure of On/Offswitch in potentiometer and mainpower activation; must be reset byopening same switch or removingmain Power before operating Isolated ma. control Card:circuit card for field retrofit of manu-ally operated Controls for automaticcontrol in response to external ana-log milliamp signal. Optically iso-lated circuit permits use in open- orclosed-loop control schemes.

10 Volt-age output from Power control isproportional to analog signal SPAN and GAIN trimmersprovided for field calibration/adjust-ment of signal response :18D (120 and 240 VAC, to30 amps) as built prior to 8 Overtemperature Switch:temperature sensor mounted toheatsink switches if heatsink tem-perature exceeds maximum allow-able level. Available to turn offcontrol or drive external V Pilot:120 VAC pilot voltageused to actuate Hz: control configured foroperation at frequencies rangingfrom 70-400 Hz, or 16-2/3and 25 VAC Input:unit rated for sin-gle-phase 277 VAC VAC Input:unit rated for 550 VAC input (+10% max.)