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Summary of Contents for Twite Instruments TD-196
- Page 1 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL TWITE INSTRUMENTS PTY. LTD. ® A.C.N. 050 199 758 No. 3 STANLEY St. MOOROOPNA VICTORIA AUSTRALIA 3629. PO. Box 176 SHEPPARTON VICTORIA AUSTRALIA 3630. Telephone (058) 253-161 FAX (058) 252-042...
- Page 2 Twite Instruments Pty. Ltd. or any of its Partners, Principals or Employees cannot be held responsible or liable for any loss of product, produce or buildings where any of Twite Instruments Pty. Ltd. Products are found to be responsible for the loss of any product, produce or buildings.
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Page 3: Table Of Contents
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CONTENTS INSTALLATION MOUNTING POWER & SOLENOID CONNECTION SENSOR INPUT CONNECTIONS SENSOR POSITIONING PRINTER CONNECTION (RS485) ALARM OUTPUTS DISPLAY CONTRAST ADJUST DISPLAY FUNCTIONS DISPLAY LED SETTING LED D/M/S LED REFRIG LED SUCTION LED FANS LED... - Page 4 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CONTENTS SET POINT PARAMETERS TEMPERATURE DIFFERENTIAL SET POINT USAGE TIMES HIGH ALARM TEMPERATURE SET POINTS LOW ALARM TEMPERATURE SET POINTS HIGH ALARM DELAY SET POINT LOW ALARM DELAY SET POINT SET DEFROSTS 21-22...
- Page 5 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CONTENTS PRINTER COMMUNICATIONS CALIBRATING AND DEFAULT VALUES :- CALIBRATION BUTTON ACCESS HOLE CALIBRATE VALUES CHECK & ALTER 43-44 CALIBRATION VALUES UPDATE TEST DISPLAYS MEMORY (RAM) TEST RESET DATA LOGGING RESET PASSWORD SET PARAMETERS TO A DEFAULT VALUE...
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Page 6: Mounting
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL INSTALLATION OUNTING The unit should be mounted at eye level for easy viewing and access to keyboard, using the fixing screws provided. Ensure it is in a dry area and not in direct sunlight. -
Page 7: Sensor Input Connections
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL INSTALLATION CONT.. ENSOR NPUT ONNECTIONS Sensor cables must be of the SHEILDED type and must not exceed 500 Metres. Sensor cables should not run parallel or in the same duct as high voltage cables. -
Page 8: Sensor Positioning
(RS485). RINTER ONNECTION Up to 16 units (TD-196) can be connected to a printer (a standard EPSON ® or compatible printer with a SERIAL interface) for printing out of temperatures at preset times, data logged temperatures and parameter set points. -
Page 9: Alarm Outputs
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL INSTALLATION CONT. LARM UTPUTS The alarm outputs (ALM terminals) are dry relay outputs which may be connected to an external voltage source. The relay is activated (energized) when the alarm is off, allowing an external alarm (if it has a battery backup connected) to sound if the unit loses power. -
Page 10: Display Led
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL DISPLAY FUNCTIONS LED D ISPLAY Used to display all parameters and set points etc. 4 Digit Led display to display temps and all other set points etc. Display LED (without the D/M/S LED lit) To display one of the D/M/S functions press the "ENT"... -
Page 11: D/M/S Led
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL DISPLAY FUNCTIONS CONT. LED D ISPLAY CONT D/M/S LED (PRESS & HOLD THE "ENT" Key, THEN PRESS THE s "DIS" Key with the display LED lit to cycle through these or normal displays) :- If OFF the display is as the previous page. -
Page 12: Refrig Led
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL DISPLAY FUNCTIONS CONT. LED D ISPLAY CONT REFRIG LED (control 4) :- Indicates that the Refrigeration (Liquid or output 4) Solenoid is on. SUCTION LED (control 3) :- Indicates that the Refrigeration (Suction or output 3 ) Solenoid is on. -
Page 13: Ent Key
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL KEY BOARD FUNCTIONS CONT. EY CONT If more than one value is required (i.e. the 4 or 12 set points for control of cooling or heating respectively, defrost and time etc.) the unit will request each value in turn to be altered. -
Page 14: Password
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL KEY BOARD FUNCTIONS CONT.. PASSWORD SING ASSWORD (use SET, ENT, s and t keys) When the password is required (PASSWORD ON, function 23) the unit will request the password when the “SET” key is pressed with the following Display. -
Page 15: Selecting Channels
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL KEYBOARD FUNCTIONS CONT.. SELECTING CHANNELS (8 CHANNEL OPTIONAL EXTRA). FUNCTIONS THAT REQUIRE CHANNEL SELECTION ARE INDIVIDUAL FOR EACH CHANNEL PROVIDING THAT THE 8 CHANNEL OPTION IS PRESENT. WHEN CHANNEL SELECTION IS REQUIRED THE FOLLOWING DISPLAY WILL BE SHOWN AFTER THE FUNCTION (TO SET) HAS BEEN SELECTED (PRESSING THE "ENT"... -
Page 16: Function Numbers
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL KEYBOARD FUNCTIONS CONT.. FUNCTION NUMBERS Temperature set point (4 set points with time relevance). Differential set point (the amount of temp change for on/off). Set point usage Times (4 times with set point number relevance). -
Page 17: Temperature
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS TEMPERATURE SET POINTS Sets the 4 temperature control set points associated with the 4 time set points be- tween -50 oC. and +150 oC. If in cooling mode only one set of 4 set points. If in heating mode there is 3 sets of 4 set points required. -
Page 18: Differential
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT.. DIFFERENTIAL SET POINT Sets the Differential between +0.2 oC. and +10.0 oC. in 0.2 oC. steps. PRESS “SET” ENTER PASSWORD IF REQUIRED PRESS s t TO SELECT NUMBER 2 PRESS “ENT”... -
Page 19: High Alarm Temperature Set Points
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT.. HIGH ALARM TEMPERATURE SET POINTS Sets the 4 High alarm temperature set points associated with the 4 time set points between -50 oC. and +150 oC. PRESS “SET” ENTER PASSWORD IF REQUIRED PRESS s t TO SELECT NUMBER 4 PRESS “ENT”... -
Page 20: High Alarm Delay Set Point
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. HIGH ALARM DELAY SET POINT. Sets the High alarm Delay. Disables the high alarm for the time set in minutes (not including the time the unit is doing a defrost) between 0 and 120 minutes. -
Page 21: Set Defrosts
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. SET DEFROSTS. 1) Sets the time that the defrost solenoid is to be on during an automatic (timed) defrost from 1 to 60 minutes in 1 minute steps. 2) Sets the time that the defrost solenoid is to be on during a manual defrost from 1 to 120 minutes in 1 minute steps. -
Page 22: Set Defrosts
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. SET DEFROSTS CONT. PRESS “SET” ENTER PASSWORD IF REQUIRED s t TO SELECT NUMBER 8 PRESS “ENT” s t TO SELECT THE AUTO DEFROST TIME. - 1/60 MINS PRESS “ENT”... -
Page 23: Defrost Auto Off
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. DEFROST AUTO OR OFF. Sets whether automatic defrost is ON (AUTO) or OFF. ONLY USED IF IN COOLING MODE. PRESS “SET” ENTER PASSWORD IF REQUIRED s t TO SELECT NUMBER 9 PRESS “ENT”... -
Page 24: Control On Off
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. CONTROL ON OR OFF. Sets whether control is Auto (on with temperature call) or off. If set to off all control ceases, including defrost if active. High and low alarms are still active and may sound if the control is left off. -
Page 25: High Alarm Active (Override)
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. HIGH ALARM ACTIVE (YES) NOT ACTIVE (NO). Sets whether the high alarm is enabled or not for each channel. PRESS “SET” ENTER PASSWORD IF REQUIRED s t TO SELECT NUMBER 13 PRESS “ENT”... -
Page 26: Differential Type
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. DIFFERENTIAL TYPE. This changes the position of the differential of the temperature set point to either TOP, BOT, or MID. This means that the set point can be at the top, bottom, or middle of the turn on and turn off temperatures. -
Page 27: Power On Delay
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. POWER ON DELAY. Sets the Delay time (in seconds) that a unit can turn on after there has been a power failure. Allows rooms to turn on at different times to stop all rooms turning on at once after a power failure. -
Page 28: Cooling Or Heating
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. COOLING OR HEATING. Sets whether the unit is to be used for Cooling or Heating. The relays are always ON (active) whether cooling or heating. In the Heating mode the first three control (relays) outputs can be used for different heating banks at different temperatures. -
Page 29: Calibrate Real Time Clock
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. CALIBRATE REAL TIME CLOCK. Adjusts the Real Time Clock in steps between -30 and +30. 1 step each. 1 step = 5.34 seconds (approx.) per month. To check clock, set to the correct time with the calibrate set to 0 and check variation after 1 week. - Page 30 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. PRINT CONT. THE VALUE SHOWN WILL BE THE CURRENT VALUE OF THE PRINT AT PRESET TIMES (either “1to4", "15", "30", "60", "120", "0" (none)). s t TO SELECT “1to4", "15", "30", "60", "120", "0" (none) PRESS “ENT”...
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Page 31: Data Logging
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. DATA LOGGING. Used to place temperature data into ram for displaying or printing at a later date. PRESS “SET” ENTER PASSWORD IF REQUIRED s t TO SELECT NUMBER 22 PRESS “ENT”... -
Page 32: Password On Off
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. PASSWORD ON OR OFF. Sets whether the Pass word is required to enable altering of set points etc. PRESS “SET” ENTER PASSWORD IF REQUIRED s t TO SELECT NUMBER 23 PRESS “ENT”... -
Page 33: Display Contrast Adjust
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. PUMP DOWN SET POINT. Sets the pump down between 0 - 1800 seconds. This leaves the fans and suction solenoids on for the set time in seconds after the control (refrigeration solenoid) has turned off. -
Page 34: Daily Set Points
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. DAILY SET POINTS. Sets which set points 1,2,3,4 may be used on each day of the week. If no set points were selected for a particular day, set point 1 will be used. -
Page 35: Line Feed Yes No
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. LINE FEED YES OR NO. Sets whether this unit is to send a line feed to the printer after it has sent its tempera- ture data, if printing at preset times. This should be set to yes if this unit is the last one in the system (largest unit identity number) or is the one printing with the smallest print interval. -
Page 36: Channels To Scan
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. CHANNELS TO SCAN. Selects channels to scan when in scan mode. If a channel is set to NOT CON- NECTED it will not be scanned even if it set to scan. -
Page 37: Control Channel
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT. CONTROL CHANNEL. Sets which channel is used for the control channel (i.e. the control may be on any single channel or the average of selected channels). If a channel was selected for control and was set to NOT CONNECTED, the control will not operate. -
Page 38: Baud Rate Set
4800 and 9600. The STOP bit is set at 1 STOP BIT and the PARITY is set at NONE. The stop bit and parity cannot be changed. The printer connected to the units must be set to the same parameters as all TD-196 units. PRESS “SET”... - Page 39 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SETTING FUNCTIONS CONT.
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Page 40: Printer Communications
(pin 7 on the 25 pin D connector). The pins 4 & 5 on the 25 pin D connector must be tied (shorted) together. This type of communication is only available if all TD-196 units are in close proximity to each other and the printer, (no more than 6 metres). -
Page 41: Calibrating And Default Values
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATING AND DEFAULT VALUES NOTE :- FOR ALL FUNCTIONS UNDER CALIBRATING AND DEFAULT VALUES, CAUTION MUST BE TAKEN AS THESE FUNCTIONS CAN CHANGE VALUES DRAMATICALLY, PAR- TICULARLY HIGH AND LOW CALIBRATION VALUES. TO ENTER INTO ONE OF THE FOLLOWING FUNCTIONS... - Page 42 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION AND DEFAULT VALUES CONT.
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Page 43: Calibrate Values Check & Alter
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION AND DEFAULT VALUES CONT. WARNING : MAKE SURE CALIBRATION VALUES ARE KNOWN BEFORE DOING THE FOLLOWING FUNCTIONS, OTHERWISE THE SENSORS MAY REQUIRE RE CALIBRA- TION IF THE WRONG CHANNELS ARE RESET OR AL- TERED BY MISTAKE. -
Page 44: Calibration Values Update
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION AND DEFAULT VALUES CONT. & A (1) “SET” & “ENT” & ALIBRATE ALUES HECK LTER “s” KEYS CONT. When the correct values have been entered (make sure to keep a copy of the correct values in case of memory loss) press the “SET”... -
Page 45: Reset Data Logging
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION AND DEFAULT VALUES CONT. “SET” & “t” KEYS ESET OGGING This deletes all data that has been logged in memory. LED shows “d r”. “ENT” Press the key for reset and normal operation. - Page 46 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION AND DEFAULT VALUES CONT. “ENT” & “s” “t” KEYS ALIBRATE ENSORS This determines the high and low calibration offset values to ensure accurate tem- perature calibration. The offsets are stored into non volatile RAM for use in software calibration during the normal run mode of the unit.
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Page 47: Start Up Defaults Values
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION AND DEFAULT VALUES CONT. “ENT” & “s” “t” KEYS CONT. ALIBRATE ENSORS Place Sensors to be calibrated into a stirred bath at 0.00 oC and leave to stabilize for approx. 5 minutes. The display will be the first sensors value that is set to CON- NECTED. -
Page 48: Specifications
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SPECIFICATIONS TD-196 :- ALL SET POINTS ARE FOR INDIVIDUAL CHAN’S WHERE APPLICABLE. INPUTS (ALL ANALOG CHANNELS) AD590 temperature sensor. LED DISPLAY 4 digit 13 mm high red. LED DISPLAY INDICATORS 16 2mm x 5mm in 2 x 8 bar graph... - Page 49 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SPECIFICATIONS TD-196 CONT. :- ALARMS SET POINT RESOLUTION 0.1 oC. ALARM DELAY SET RANGE (HI & LO) 0 - 120 minutes. (1 on each channel). ALARMS DELAY SET RESOLUTION 1 minute. ALARM (INTERNAL) pulsed visual and audio.
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Page 50: Specifications
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL SPECIFICATIONS TD-196 CONT. :- DATA LOGGING TIME BETWEEN :- 15 min, 30 min, 60 min, 120 min or 1 to 4 times per 24 hour day. PASSWORD four numbers 0-9 (may be active or not active). -
Page 51: Error Messages
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL ERROR MESSAGES If this is displayed it means that the calibration values are corrupt or have been altered. The alarm will be active (on) and all controls will be turned off. To correct the alarm fault use the previous functions "CALIBRATE VALUES CHECK &... -
Page 52: Error Messages
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL ERROR MESSAGES CONT. If this is displayed it means that the current sensors temperature that is displayed is faulty. Check the cable to the sensor for an open circuit or short circuit. If the sensor that is faulty (only if the 8 channel multiplexer option is present) is used as the control sensor only, the alarm will sound and all controls will be turned off. -
Page 53: Remote Display Module
RESET OUNTING The unit may be fixed or placed in any convenient location and may be up to 500 metres from the furthermost TD-196 unit. OWER UPPLY The unit requires 8 to 12 volts a.c. or d.c. at 300 ma. A common 240 ac adapter which supplies a low voltage output within this range should be used. -
Page 54: Rs485 Input
The + wire from all TD-196 units must be connected to the centre ring or the plug and the - wire from all TD-196 units must be connected to the tip of the plug, the large section (earth or section with the cover screw) is left unconnected. -
Page 55: Keyboard
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL REMOTE DISPLAY MODULE CONT. EYBOARD The "ENT" key is for entering the value/s selected while setting functions.. The "SET" key is used to set one of the 6 functions and to select channels while doing function 4. -
Page 56: Function Numbers
Scan Time (the time between each channels/unit display in scan mode) Scan Yes or No (whether the unit is to scan automatically or not). Select TD-196 Units (which TD-196 units are allowed to display). Select TD-196 Channels (which TD-196 units channels are allowed to display). -
Page 57: Scan Units Yes Or No
ETTING UNCTIONS SCAN UNITS YES OR NO Sets whether the remote display will scan or not for each TD-196 unit that is connected via the RS485 serial line. NOTE :- If the remote display is set to scan/display a TD-196 unit that is not connected to the serial line, it will time out after approximately 1 minute and not display/scan that unit but will not alter the set point. -
Page 58: Scan Channels Yes Or No
This means that if a TD-196 unit is then connected to the serial line the remote display will automatically pick up the information and proceed to display/scan this TD-196 unit channels. -
Page 59: Baud Rate
If this is displayed on the 4 digit display, the remote display has lost the serial communications line. The TD-196 thermostats send their data every 30 seconds, so it may take up to 30 seconds for the Remote Display to respond to the TD-196 units after loss of com- munications. -
Page 60: Default Values
When all LED'S are lit press the "ENT" key to reset the unit for normal running. It may take up to 30 seconds for the Remote display to respond to the TD-196 units data for display. If the battery backed ram loses its power. The Remote Display will auto- matically set all values to there default values if the ram loses its power. -
Page 61: Reset
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL REMOTE DISPLAY MODULE CONT. ESET To reset the Remote Display, press the reset button (lightly with a small tipped pen or pencil) and release it, or disconnect the power supply and re connect. This will reset the unit in case of malfunction. -
Page 62: Calibration Values
TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL CALIBRATION VALUES CHANNEL NUMBER HIGH... - Page 63 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL NOTES...
- Page 64 TWITE INSTRUMENTS THERMOSTAT MODEL TD-196 OPERATING MANUAL NOTES...
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