TC308 LOW COST TWO TERM DIGITAL DISPLAY TEMPERATURE CONTROLLER

INSTRUCTION MANUAL

CONTENTS DESCRIPTION..........................................................2 INSTALLATION.........................................................2 CONTROL ADJUSTMENTS.....................................3 TUNING.....................................................................3

TECHNICAL SPECIFICATION.................................5 ORDERING INFORMATION.....................................5 SUPPLIER INFORMATION......................................5

TC308 Instruction Manual

Powtier Controls Limited

DESCRIPTION The TC308 is housed in a durable sheet metal and flame retardent plastic housing. The seven segment LED display monitors measured value continuously and the error bar indicator shows the proximity to setpoint.

Setpoint can be displayed by depressing the setpoint changeover switch on the front panel. The setpoint, proportional band and manual reset controls are located at the front and concealed behind a snapshut door to minimise any accidental re-setting. Setpoint adjustment is made by turning the setpoint thumbwheel.

Dimensions

bottom of the instrument. Maximum panel thickness is 10mm.

INSTALLATION The instrument requires a 92X92mm panel cut out and is fixed by retainers positioned on the top and

All external wiring is made to the rear of the instrument via M3 screw terminals.

Wiring diagram.

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TC308 Instruction Manual

Powtier Controls Limited

means of P1 - located on top of the instrument.

CONTROL ADJUSTMENTS PROP. BAND - Proportional Band adjustor gives Xp of 1% to 10% of span is located at the front and concealed behind the snap-shut door. MAN. RESET - Manual Reset adjustor removes the steady state error inherent in PD control; it is located at the front and concealed behind the snap-shut door. HIGH ALARM (option) - gives relay change-over when the measured temperature exceeds the high alarm limit at or above setpoint and is settable by

LOW ALARM (option) - gives relay change-over when the measured temperature falls below the lowalarm limit at or below setpoint and is settable by means of P2 - located on top of the instrument. BAND ALARM (option) - gives relay change-over when the measured temperature falls outside the high and low alarm limits; these are settable by P1 band high limit; and P2 - band low limit; both located on top of the instrument. HEAT (OR COOL) CYCLE TIME - the timeproportioning output cycle time is adjustable between 4 and 20 seconds

Control adjustments. If continuous oscillations occur at around setpoint temperature, turn Prop. Band adjustor clockwise to increase proportional band until oscillations cease.

TUNING 1. Set Man. Reset to fully counter clockwise (zero). 2. Set Prop. Band to mid-position (>5%). 3. Set P3 to fully clockwise to give maximum output cycle time.

If the measured temperature settles at a temperature below setpoint and without overshoot - then turn Man. Reset adjustor clockwise until measured temperatureeventually equals setpoint temperature.

measured

If continuous oscillations occur at below setpoint temperature, adjust P3 couter-clockwise to reduce output cycle time until oscillations cease.

If temperature overshoot occurs, but eventually decays to a steady temperature below setpoint - then to reduce overshoot, turn Prop. Band adjustor clockwise to increase the proportional band.

If the measured temperature remains below the setpoint when the Man.Reset is alaready at its maximum (fully clockwise), then turn the Prop. Band adjustor counterclockwise (reducing the proportional band) to reduce the steady-state error.

4. Set setpoint to desired working temperature. 5. Observe temperature.

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TC308 Instruction Manual

Powtier Controls Limited

Manual reset

0 to 50% output power at span. ALARM OUTPUTS OPTIONS Relay 2A resistive at 230 Vrms. High alarm 0 to 20% of span. Low alarm 0 to 20% of span. Band alarm 0 to 20% of span. ENVIRONMENTAL Supply voltage 115/230V +/-15% 50/60Hz 100/200V +10% -15% 50/60Hz. Operating temperature 0 to 50 Deg.C. PERFORMANCE Indication accuracy Better than 0.5% of span +/-1 digit. Supply voltage variation Negligible effect. GENERAL Display digit 3 or 31/2 digits. Display 7 segment and negative sign display; digit size 13mm height by 7.4mm width. Error indication 3 LED display; upper LED +1% of span, lower LED -1% of span. Dimensions 96x96x125mm. Panel cut out dimensions 92x92mm. Weight 750g maximum. Power consumption 6VA maximum.

TECHNICAL SPECIFICATION INPUT Thermocouple Standard Cold junction Compensation Thermocouple break protection

Resistance Thermometer 2 or 3 wire RTD (Pt 100) OUTPUTS Relay Logic output Triac output Power feedback CONTROL PD control Proportional band Xp Self-adjusting prop. Bnad

Derivative time td

ASTM E230, BS4937 DIN 43710. Automatic. Upscale (heat O/P) or downscale (cool O/P) fitted as standard; display shows -.-. Lead resistance error is automatically reduced by using 3 wires. BS 1904, DIN 43760. 5A resistive at 230V rms. Non-isolated 10mA 12V dc. 1A or 13A at 230 Vrms. To stabilise output against line voltage variation. Proportional and derivative. 1% to 10% of span. 0.5% to 10% when setpoint at span; 2% to 20% when setpoint at mid-span. 4 to 20 seconds, correspond to heat cycle time.

ORDERING INFORMATION You are welcome to order by description or code. 308 - 00 INPUT...................|.........|.........|.........|.........|.........| SCALE............................|.........|.........|.........|.........| OUTPUT..................................|.........|.........|.........| SUPPLY VOLTAGE............................|.........|.........| OPTIONS.....................................................|.........| END OF CODE......................................................| INPUT Iron-Constantan (J) BS -50 to 500 10 Fe-Konst (J) DIN -50 to 500 30 Chromel Alumel (K) -50 to 500 20 0 to 999 23 0 to 1200 21 Resistance Thermometer (PT100) -50 to 200 40 SCALE Degree Celsius .........C Degree Fahrenheit.....F OUTPUT Heat (or cool) output relay................................10[or 11] logic................................20[or 12] triac 1A...........................30[or 13] triac 13A (3KW)..............40[or 14] SUPPLY VOLTAGE 115/230V +/-15% 50/60Hz..............1 100/200V +10% -15% 50/60Hz.......2 22 November 1994 Issue 2.0

OPTIONS Alarm low deviation............................................21 high deviation..........................................22 END OF CODE......................................................00

Please consult Sales office for other possible options and scales. ORDER EXAMPLE: A TC308 with J-type thermocouple input, scaled -50 to 500 °C, relay heat output, operating at 230V and without any option will have the code:308-10-C-10-1-00.

SUPPLIER INFORMATION Powtier Controls Limited Unit 4, Parkland Business Centre Chartwell Road, Lancing West Sussex BN15 8UE England Tel: +44(0)1903 750800 Fax: +44(0)1903 750678 Email: [email protected] -4-

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