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T775U Series 2000 Electronic
Stand-Alone Controller
INSTALLATION INSTRUCTIONS
PRODUCT DESCRIPTION
The T775 electronic stand-alone controllers are the next
generation of universal controls capable of remote
sensing of temperature, humidity, pressure, etc. and
providing switched and proportional outputs to various
types of loads. A built-in time clock is standard.
The T775U controller allows a wide range of sensors to
be configured. Humidity, pressure, temperature, or any
0-5 Vdc, 0-10 Vdc,
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER a Temperature Sensors (Sensor A or B) Universal Sensors (Sensor A only) The controller accepts 1,097 Ohms PTC at 77°F (25°C): The controller accepts 0-5 Vdc, 0-10 Vdc or 4-20 mA input , etc. They may • 50021579-001 – Standard sensor (included with all for temperature, pressure, humidity CO 2 be programmed in units of °F, °C, %, Pa, kPa, PSI, In models except NEMA 4X models) W.C., PPM, or may be unitless (none). • T775-SENS-WR – Water resista
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER Controller Dimensions TOP 1 (25.5) 7/8 (22.5) 2 15/16 (74) 4 13/32 (112.1) 1/2 (12.4) 3 31/32 (101) LEFT RIGHT 4 1/16 (103.4) 1/64 (3.8) 8 5/32 (207.1) 7 23/32 4 1/16 (103.4) (196) 2 13/16 (71.8) 2 11/16 (68.1) FRONT VIEW 7/8 (22.5) 7/8 (22.5) 7/8 (22.5) M24546 1 (25.5) BOTTOM Fig. 1. T775U Dimensions in inches (mm). 6. Programming the Controller with no Reset – see page 25 BEFORE INSTALLATION or Programming the Controller with Reset – page 28
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER Use a screwdriver to pry out only the knockouts that you WIRING will use. If mounting on DIN rail, be sure to remove the knockouts All wiring must comply with applicable electrical codes before mounting. See “Controller Wiring” on page 7 and and ordinances, or as specified on installation wiring Fig. 12 on page 9 for recommended knockout usage and diagrams. Controller wiring is terminated to the screw locations. If you do not use an ope
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER Temperature Sensor Wire Type and Size SENSORS Temperature sensors use standard AWG 18/2 unshielded wire. For cable runs greater than 25 feet or where electrical interference may be a problem, shielded cable is recommended. See Fig. 4. Refer to “Temperature Sensor Calibration” on page 10 for wire size selection where cable runs are longer than 25 feet. TO T775 CONNECTIONS (SENSOR A) OR (SENSOR B). M24548 Fig. 3. Parallel-series wiring of sen
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COM OUT PWR COM OUT VIN PWR GND VO T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER SHIELDED CABLE SHIELDED CABLE NOTES: NOTES: C C 1. SHIELDED CABLE MUST BE S 1. SHIELDED CABLE MUST BE S SENSOR A CONNECTED TO A SEPARATE SENSOR A CONNECTED TO A SEPARATE V V 1 EARTH GROUND. HOWEVER, EARTH GROUND. HOWEVER, T T SENSOR B SENSOR B DO NOT GROUND SHIELDED DO NOT GROUND SHIELDED T T CABLE AT SENSOR END. CABLE AT SENSOR END. 2. TO MINIMIZE NOISE PICKUP, 2. TO MINIMIZE NOISE PICKUP, MAKE SENSOR
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER See Fig. 11 on page 8 for locating the appropriate power Controller Wiring input, remote sensors input, low voltage, contact closure, and load output terminals. Access to the terminals can be gained through standard WARNING conduit knockouts (A through E in Fig. 11 on page 8) Electrical Shock Hazard. located around the perimeter of the enclosure: Can cause severe injury, death or property • Knockouts A and B should be used only for sensor
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER Controller Wiring Details The wiring connection terminals are shown in Fig. 11 and are described in Table 2. See Fig. 12 – Fig. 18 beginning on page 9 for typical T775U wiring applications. Fig. 11. T775U Terminal and Feature Locations. KNOCKOUT A C – T SENSOR A B S + T MOD 1 R – V 1 W + 2 T SENSOR B B T MOD 2 R – W + DIGITAL INPUT KNOCKOUT B POWER 3 C + 24 VAC POWER 120/240 VAC 1 WHEN USED FOR TEMPERATURE OR 4-20mA SENSING, SENSORS A
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER WIRING APPLICATION C – T EXAMPLES 1 S + T V Fig. 12 – 18 illustrate typical controller wiring for various applications. NOTE: The electronic Series 90 output provided with modulating T775 models can not drive electro- mechanical slidewire devices like older Series 3 modulating meters (prior to Series 6), V9055s, and S984s. NOTE: For a wiring example of three Series 90 Modutrol Motors, refer to the T775A/B/M Series 2000 Electronic Stand
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER If any wiring changes are required, first be sure to remove HONEYWELL ELECTRONIC power from the controller before starting work. Pay SERIES 90 MODUTROL MOTOR particular attention to verifying the power connection (24, 120, or 240 Vac). 1 T1 T2 B R W After the controller is mounted and wired, apply power. POWER Power Loss OUTPUT The date and time settings are retained for 24 hours after 2 B a power outage. After a power loss of more than 24 h
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER Table 4. Temperature Sensor Calibration for HOME Resistance Loss due to Wire Length. MENU AREA RELAYS 1 2 Temperature Offset in ON a SENSORS °F (Feet) AWG SENSOR A Rating mΩ/ft 200 ft 500 ft 1,000 ft oF 78 14 2.5 0.46 1.14 2.28 SENSOR B o F 16 4.0 0.72 1.82 3.64 84 DATA AREA 18 6.4 1.16 2.90 5.82 20 10.2 1.86 4.64 9.28 MOD1 40% 22 16.1 2.92 7.32 14.64 MOD2 60% LOCK ICON DI ON Temperature Offset in a home men
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER Up and Down Arrow Buttons ( and ) Program, Schedule, and Summary Use these buttons to move your selection up and down Menus through a menu or list. To access these menus from the home screen, press the • When the desired item is highlighted, you press the MENU button. See Fig. 22. arrow button to display that item’s content. • When a value is displayed (e.g. 70°F), the up and down arrows increase and decrease the value. MENU DISPLAY
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER NOTES: IMPORTANT 1. If you press the HOME button or there is no 1. This action sets the maximum setpoint value of keypad activity for four minutes, you exit all outputs to the setpoint high limit maximum. Program mode and return to the home 2. Setting the high limit setpoint maximum is irre- screen. versible. If you perform the action inadvertently 2. If you press the MENU button, you exit and and this setpoint adversely affects the control o
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER To change the controller’s sensors and output setup Setup Procedure parameters, perform the following procedures in the order The Setup process uses a hierarchical menu structure listed: that is easy to use. You press the and arrow buttons 1. Enter Setup mode — see “1.1. Entering Setup to move forward and backward through the menus. Mode” 2. Setup Sensors — see “1.2. Setting up the Sensors” NOTE: The menus can display only those relays t
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER SETUP SETUP 1.2.2.1. TYPE (Sensor A only) SENSORS SENSORS SENSOR A SENSOR A 1. From the Sensor A selections, use the and TYPE TYPE buttons to highlight TYPE. PT 1000 2. Press the button to display the type values. 0-5V 3. Use the and buttons to highlight the desired 0-10V 4-20MA value PT1000 (1097Ω PTC), 0-5V, 0-10V, or 4- 20MA. Default: PT1000 NOTE: The default label PT1000 refers to a 1097Ω PTC temperature sensor. SELECT TYPE FO
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER SETUP SETUP SETUP SENSORS SENSORS SENSORS 1.2.2.2.3. MIN or MAX VALUE (Sensor A only; SENSOR A SENSOR A SENSOR A 0-5V, 0-10V or 4-20mA) MIN VAL MIN VAL MAX VAL OR The minimum and maximum values display only for MAX VAL Sensor A when its type is 0-5V, 0-10V or 4-20MA. 1. From the Sensor A selections, use the and buttons to highlight MIN VAL or MAX VAL. o o F F 2. Press the button to display the units. 0.0 0.0 3. Use the and butt
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER SETUP 1.2.2.5. Exit Sensor A Setup SENSORS Press the button to exit Sensor A selections and return SENSOR A to the Sensors menu. UNITS or CALIBRATE LABEL Use the and buttons to highlight EXIT and press the EXIT button. Continue with “1.2.3. SENSOR B (Temperature only)” M24596 Fig. 33. Setup - Sensors - Sensor A - Exit. 1.2.3. SENSOR B (Temperature only) SETUP SETUP For two-sensor reset control, Sensor B must always be SENSORS SENSORS th
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER SETUP SETUP 1.3.1. Setting up the Modulating Outputs OUTPUTS OUTPUTS MOD 1 MOD 1 1. From the Output menu, use the and buttons to TYPE highlight the desired modulating output (MOD 1 or MIN OUT % MOD 2). INTEGRAL 2. Press the button to display the selected MOD DERIVATIV SCHEDULE menu. RESET EXIT Use the remaining procedures, beginning with “1.3.1.1. TYPE (of output signal)”, to set up each modulating output. If you have two modulating
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER NOTES: (Integral Timing) 1. The Integral time is factory set for 400 seconds. This the offset from setpoint during steady state control is a good middle range and should satisfy many that is often seen in proportional only control. applications. The integral time can be increased for applications where sensed response is slow, and can 3. Keep in mind that control is most sensitive to be decreased for applications where sensed throttling rang
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER SETUP SETUP OUTPUTS OUTPUTS 1.3.1.6. RESET MOD 1 MOD 1 This selection enables the controller’s Reset function, and RESET RESET allows each output to be individually programmed for YES-BOILER Reset or No Reset. YES-OTHER NO IMPORTANT To use the Reset function of the controller, the first modulating output (MOD1) must be set for Reset here. USE RESET FOR The RESET choice is offered for all outputs in setup MOD1 M24605 mode, and you can
