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Summary of Contents for Aerotech ST 5121
- Page 1 Temperature Controller ST 5121 USER'S MANUAL A e r o t e c h , I n c . F O R M : QM 1333 4215 Legion Dr. Mason, MI 48854-1036 USA October 1998 Ph. (517) 676-7070 Fax (517) 676-7078...
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Page 2: Table Of Contents
TABLE OF CONTENTS Page PRECAUTIONS ..............3 FEATURES ................ 4 LOCATION OF THE CONTROLS ........6 Controller Status Leds ............7 Internal Switches ............... 7 INSTALLATION ..............8 Mounting Instructions ............8 Connections ..............8 Motor Types ..............9 Heating / Cooling Option ........... 11 Temperature Probes ............ -
Page 3: Precautions
PRECAUTIONS We strongly recommend installing supplementary natural ventilation, a failure alarm system as well as a back-up ther- mostat on at least one cooling stage (refer to the wiring diagram enclosed with this user's manual to connect the ther- mostat). Although fuses at the input and outputs of the controller protect its circuits in case of an overload or overvoltage, we recommend installing an additional protection device on the... -
Page 4: Features
FEATURES The ST 5121 is an electronic device used for environmental control in live- stock buildings. It allows the user to maintain a specified target tempera- ture by controlling the operation of ventilation and heating equipment. One stage of variable speed cooling fans can be connected to the controller, as well as one stage of constant-speed fans and two stages of either constant- speed fans or heating units. - Page 5 CONTROL OF AIR INLET MOVEMENT If the ST 5121 is used in combination with a SB 2000 controller, the move- ment of the air inlets can be coordinated with the operation of the fans using a potentiometer located on the curtain machine or baffle actuator.
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Page 6: Location Of The Controls
LOCATION OF THE CONTROLS QM 1333.rev.00... -
Page 7: Controller Status Leds
ST 5121 CONTROLLER STATUS LEDS INTERNAL SWITCHES The internal switches are located on the inside of the front cover. When the controller is shipped from the factory, all the switches are set to OFF. QM 1333.rev.00... -
Page 8: Installation
INSTALLATION OUNTING INSTRUCTIONS Open the latch and lift the cover. Remove the black caps located on each of the four mounting holes. Mount the enclosure on the wall using four screws. Be sure the electrical knockouts are at the bottom of the enclosure in order to prevent water from entering the controller. -
Page 9: Motor Types
ST 5121 OTOR TYPES The relationship between the voltage supplied to a motor and its operating speed is described by a motor curve. This curve varies with the make and capacity of the motor. The various motors available in the industry have been divided into five categories and the controller has been programmed with a different motor curve for each of these categories. - Page 10 9" AT09Z1, AT10SP1, AT10AP1 (120 VAC) AT09Z2, AT10SP2, AT10AP2 (240 VAC) 14" AT14Z, AT14F, AT14G 15" AT15AP, AT15SP 16" AT16Z, AT16F, AT16G 18" AT18Z, AT18F, AT18G, GB18 24" AT24Z, AT24F, AT24G, GB24 1250 36" AT36Z, AT36ZB1, AT36G1, AT36GB1 1250 The above values assume the following conditions unless noted otherwise: 1) Input Voltage: 240 VAC 2) Static Pressure: 0.05"...
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Page 11: Heating / Cooling Option
ST 5121 EATING / COOLING OPTION Stages 3 and 4 can operate as heating or cooling stages. Set switches # 3 and # 4 to OFF to use both stages for cooling. Set switch # 3 to ON and switch # 4 to OFF to use Stage 4 for heating and Stage 3 for cooling. - Page 12 ST 5121 Extending the Probes Each probe can be extended up to 500 feet (150 meters). To extend a probe: Use a shielded cable of outside diameter between 0.245 and 0.260 in (6.22 and 6.60 mm) (the cable dimensions should not be under 18 AWG) to ensure the cable entry is liquid tight.
- Page 13 ST 5121 If the probe is defective, the letters "PR1" are displayed, alternating with the state of the probe and the letter "P". For each additional probe connected to the controller: Press the push-button once again. If the probe is not defective, the letters "PR#"...
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Page 14: Changing The Parameter Settings
CHANGING THE PARAMETER SETTINGS HE MEANING OF A FLASHING DISPLAY The display will flash in cer- tain cases and not in others. The flashing indicates that the value shown can be adjusted. A value that is not flashing cannot be adjusted. OCKING THE PARAMETER SETTINGS The parameter settings can be locked to prevent accidentally modifying them. -
Page 15: Temperature Settings
TEMPERATURE SETTINGS EMPERATURE UNITS Temperatures can be displayed in either Celsius or Fahrenheit units Set internal switch # 2 to the desired position: • ON to display temperatures in Celsius units. • OFF to display temperatures in Fahrenheit units. IEWING TEMPERATURES The readout can display values from - 40.0 F to 120... - Page 16 ST 5121 Press the push-button. The temperature reading from probe 1 is dis- played, alternating with the letters "Pr 1" and the on/off state of probe For each additional probe, press the push-button. The temperature reading from probe x is displayed, alternating with the letters "Pr x"...
- Page 17 ST 5121 Turn the adjustment knob clockwise by one notch. The minimum temperature is displayed, alternating with the letters "Lo". Turn the adjustment knob clockwise one notch further. The maxi- mum temperature is displayed, alternating with the letters "Hi". Turn the adjustment knob clockwise a third notch. The room tem- perature is displayed again.
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Page 18: Temperature Set Point
ST 5121 EMPERATURE SET POINT The temperature set point is the target room temperature. It can be adjusted between -40.0°F and 99.9°F (-40.0°C and 37.7°C). Adjusting the Temperature Set Point Set the selection knob to SET POINT / TEMP. CURVE.The current set point flashes on the display. -
Page 19: Temperature Curve
ST 5121 EMPERATURE CURVE The user can define a temperature curve to adjust the set point automatically over a given time period. Temperature Days A curve is defined using six points. Each point specifies a day number and a set point for that day. Once the points of the curve are defined, the curve must be activated. - Page 20 ST 5121 Specifying the Curve Set the selection knob to SET POINT / TEMP. CURVE. The current temperature set point flashes on the display. Press the push-button. The word OFF is displayed indicating that the termperature curve is deactivated. If this is not the case, see below to deactivate the curve.
- Page 21 ST 5121 Activating the Temperature Curve If you have just finished specifying the points on the curve: Press the push-button once again. The word OFF flashes on the display. Turn the adjustment knob clockwise one notch. The word ON flashes on the display and the Temperature Curve Pilot Light flashes, indicat- ing that the temperature curve is now activated.
- Page 22 ST 5121 Viewing Current Set Point and Day Number When the temperature curve is activated, the current temperature set point and day number can be viewed at any time. The current day number can also be adjusted in order to move forward or backward on the temperature curve.
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Page 23: Ventilation Settings
VENTILATION SETTINGS OOLING OPERATION The ST 5121 controls one stage of variable-speed fans (Stage 1), one stage of constant-speed fans (Stages 2) and two optional stages of constant- speed fans (Stages 3 & 4). Ventilation Level STAGE 4 STAGE 3... - Page 24 ST 5121 If the room temperature falls: • At Stage 4 Starting Temp - 1.5 F: the stage 4 fans return to a stop. • At Stage 3 Starting Temp - 1.5 F: the stage 3 fans return to a stop.
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Page 25: Minimum Ventilation Cycle
ST 5121 INIMUM VENTILATION CYCLE When the room temperature is below the set point, the Stage 1 fans operate according to the minimum ventilation cycle. Running the fans even though ventilation is not required for a cooling purpose is useful to reduce humidity levels and supply oxygen to the room. - Page 26 ST 5121 Adjusting Minimum Speed The minimum speed can be adjusted between 10 and 100% of the full speed of the fans. Set the selection knob to STAGE 1 — MINIMUM SPEED/CURVE. The current minimum speed for Stage 1 flashes on the display.
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Page 27: Ventilation Settings
ST 5121 ENTILATION SETTINGS Adjusting the Stage 1 Bandwidth The Stage 1 bandwidth is the temperature interval within which the Stage 1 variable-speed fans increase or decrease in speed proportionally to the temperature (see the diagram above). The hysteresis is fixed at 0.3... - Page 28 ST 5121 Adjusting the Stage 3 Starting Temperature The Stage 3 starting temperature is the temperature at which the Stage 3 fans start running (see the diagram above). The hysteresis is fixed at 1.5 and determines when the fans return to a stop. When this value is adjusted, all the starting values for consecutive stages are adjusted by the same amount.
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Page 29: Minimum Ventilation Speed Curve
ST 5121 INIMUM VENTILATION SPEED CURVE The user can define a minimum ventilation speed curve to adjust the Stage 1 minimum speed automatically over a given time period. Each curve is defined by six points. Each point specifies a day number and a fan speed for that day. - Page 30 ST 5121 Table 1. STAGE 4 THRESHOLD VALUE OPERATION ''Set Point - 5.0°F (2.8°C)'' Cooling Heater A Starting Temperature - 5.0°F (2.8°C) Heating Interaction Between the Temperature Curve and the Mini- mum Speed Curve • The minimum speed curve can be activated only if the temperature curve is already activated •...
- Page 31 ST 5121 • When the minimum speed curve is activated, it will effectively be oper- ating (i.e. the controller will begin to adjust the minimum speed ac- cording to the specified points of the curve) only when the current day number of the temperature curve reaches the first day number of the minimum speed curve.
- Page 32 ST 5121 Specifying the Minimum Speed Curve Set the selection knob to STAGE 1 — MINIMUM SPEED / CURVE. The current minimum speed flashes on the display. Press the push-button. The word OFF is displayed, indicating that the minimum speed curve is deactivated. If this is not the case, deacti- vate the curve as described below.
- Page 33 ST 5121 iii) Certain restrictions apply to reduce the risk of errors: • decreasing minimum speeds are not allowed. • the minimum speed variation cannot exceed 10% per day. Activating the Minimum Speed Curve If you have just finished specifying the points on the curve: Press the push-button once again.
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Page 34: Mist Cooling
ST 5121 Set the selection knob to STAGE 1 — MINIMUM SPEED / CURVE. The current minimum speed is displayed. Press the push-button. The current day is displayed, alternating with the letters "cur. dAY". Deactivating the Minimum Speed Curve Set the selection knob to STAGE 1 — MINIMUM SPEED / CURVE. - Page 35 ST 5121 Mist units turn on in timer mode Mist units turn off Mist Room Set Point Temperature Starting Temperature Time on (minutes) - The mist units operate according to a timer cycle.The time on is the running time of the mist units.
- Page 36 ST 5121 Adjusting the Mist Starting Temperature The difference between the mist starting temperature and the starting temperature of the preceding stage can go from 0.5°F to 20.0°F (0.3°C and 11.1°C). Set the parameter selection knob to the starting temperature setting of the mist stage.
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Page 37: Heater Settings
HEATER SETTINGS RINCIPLE OF OPERATION The graph below explains the operation of the heaters using sample values. Heating Heater B OFF Heater B ON Heater B Heater A ON Heater A Heater A OFF Room Temperature HEATER HEATER Set Point A / ON B / ON TEMP. - Page 38 ST 5121 Adjusting the Heater Off Temperature The heater off temperature can provide substantial energy savings if cor- rectly adjusted according to the outside temperature. It is the temperature at which the heating units turn off (see diagram above). The off tempera-...
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Page 39: Alarm Settings
ALARM SETTINGS The controller sets off an alarm in the case of a power failure, a fault in the supply circuit or a high or low temperature. Temperature alarms are defined according to the set point as shown in the diagram below. Room High Temperature Alarm Temperature... -
Page 40: Troubleshooting Guide
TROUBLESHOOTING GUIDE SOLUTION PROBLEM CAUSE The circuit breaker Correct the problem and reset There is no at the service panel the circuit breaker. display. is off or tripped. The wiring is Correct the wiring. incorrect. The voltage selector Set the switch to the correct switch is in the position. - Page 41 ST 5121 SOLUTION PROBLEM CAUSE A variation in The display Be sure the probes are dry. resistance is shows sudden Locate them away from drafts induced on a variations in the and sources of radiant heat- probe. room or outside ing.
- Page 42 ST 5121 SOLUTION CAUSE PROBLEM The stage 1 Adjust the minimum speed to The minimum variable speed a higher value. speed is too low. cooling fans are not running. The fan motor is Check if the motor is defective (continued) defective.
- Page 43 ST 5121 PROBLEM CAUSE SOLUTION Set the stage 1 time off to The stage 1 The stage 1 time off variable speed a value other than zero. is set to zero. cooling fans run continuously Correct the wiring. Be sure...
- Page 44 ST 5121 SOLUTION CAUSE PROBLEM Be sure the cable is firmly The display board The cooling plugged in. interconnect cable fans are not is not properly running. plugged into the power supply board. The heaters are The fan motor or Check if the motor or heater is not turning on.
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Page 45: Technical Specifications
TECHNICAL SPECIFICATIONS Supply: - 115/230 VAC (-18%, +8%), 60 Hz, L1 same phases as Stage 1, overload and overvoltage protection fuse F11-1A fast blow. - 12 VDC for AC back-up supply; can activate stages 2, 3, 4 and alarm if supplied with DC back-up voltage. Stage 1: Variable output, 60 Hz, 10A FAN (3/4 HP/115 VAC) / (1.5 HP/ 230VAC), fuse F1-15A slow blow. -
Page 46: Factory Settings
FACTORY SETTINGS QM 1333.rev.00... - Page 47 ST 5121 NOTES: i) These initial parameter settings will not be retained in the controller's memory. Each new setting will replace the preceding one. ii) If the power supply is cut off, the last parameter settings will be retained in memory until the power is restored.
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