Honeywell T775U - Manual (Page 10)

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER
62-0255—07 10
Fig. 17. Wiring for Series 90 Modutrol Motor Control.
Fig. 18. Wiring for Changeover Relay and
Minimum Position Potentiometer used with
Series 90 Modutrol Motors.
CHECKOUT
Inspect all wiring connections at the controller terminals,
and verify compliance with the installation wiring
diagrams.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before beginning wiring
or making wiring connections, to prevent electrical
shock or equipment damage.
If any wiring changes are required, first be sure to remove
power from the controller before starting work. Pay
particular attention to verifying the power connection
(24, 120, or 240 Vac).
After the controller is mounted and wired, apply power.
Power Loss
The date and time settings are retained for 24 hours after
a power outage. After a power loss of more than 24 hours,
the date and time settings may need to be reentered. All
other settings are stored permanently.
Humidity, Pressure, and Universal
Sensor Calibration
A calibration parameter is available using Setup mode.
The calibration range is +/- 10% of the Min Value to Max
Value range setup for the sensor. See examples in
Table 3.
The calibration value is set in section “1.2.2.3.
CALIBRATE (Sensor A or B)” on page 16.
Temperature Sensor Calibration
As wire length increases, resistance increases and thus
the temperature reading increases. If necessary, calibrate
the sensor input by reducing the value by the amount
shown in the Table 4 on page 11. For example, a wire run
with 18 gauge wire of 1,000 feet, requires a calibration
offset of -6.0°F.
IMPORTANT
If the calibration value in the table exceeds the
controller’s calibration limits of +/-10°F (+/-6°C),
you must use a heavier gauge wire.
For example, with a wire run of 1,000 feet you
must use 20 AWG wire or heavier in order to cal-
ibrate for wire loss within the limits of the control-
ler.
See “1.2.2.3. CALIBRATE (Sensor A or B)” on page 16 for
the instructions to enter the calibration value.
NOTE: The resistance output on the temperature
sensors change at the rate of 2.2 Ohms per °F
(3.85 Ohms per °C).
M24560A
TO VERIFY OUTPUT, TEST OPEN CIRCUIT VOLTAGE BETWEEN
THE MOD 1 TERMINALS W AND R.
- MINIMUM (DRIVE CLOSED) SIGNAL LESS THAN 0.17 VDC
- MAXIMUM (DRIVE OPEN) SIGNAL IS GREATER THAN 1.7 VDC
USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
1
2
3
MODULATING
OUTPUT
TERMINAL
(MOD 1)
B
R
W +
–
B
R
W +
–
T1 T2 B W R
POWER
OUTPUT
HONEYWELL ELECTRONIC
SERIES 90 MODUTROL MOTOR
1
2
3
M24561A
USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.
A 250 OHM RESISTOR PROVIDES 40% AUTHORITY WHEN
USING A 150 OHM MINIMUM POSITION POTENTIOMETER.
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
1
2
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W +
–
B
R
W +
–
T1 T2 B W R
POWER
OUTPUT
2
HONEYWELL
ELECTRONIC SERIES 90
MODUTROL MOTOR
1
W R B
MINIMUM POSITION
POTENTIOMETER
(Q209)
SPDT CHANGEOVER
(H205 OR H705)
3
3
Table 3. Calibration Range Examples.
Units
Min.
Value
Example
Max.
Value
Example
Min-Max
Range
Result Calibration
Range
PSI 100 400 300 ± 30 PSI
Inches
W.C. -20.0 20.0 40 ± 4 in. W.C.
Pa or
kPa -2,000 3000 5000 ± 500 Pa/kPa
% 10 100 90 ± 9%