Spartan Terminal Unit Zone Valve Actuator PWM 0.25-5.0 Sec Spring Return 24V N/O

Spartan ME4740 Terminal Unit Zone Valve Actuator PWM 0.25-5.0 sec Spring Return Spring Return 24v
Proportional microprocessor based control valve actuator.
This Unit will drive 2, 3 or 4 port terminal unit or zone valves for the control of hot water up to 250˚F (120˚C), chilled water to 35˚F (2˚C) 50% glycol, and low pressure steam
A 24Vac hysteresis brushless motor is used to position a valve in response to an input signal (on red wire). A quadrature optical system using two LED’s, two phototransistors and a rotating flag on the rear of the motor measure the displacement of the valve. A microprocessor is used to access the input signal, monitor and store the position count, determine the count difference and appropriately control the drive to the motor.
At power-up the valve performs a 50 second re-span operation, the valve is driven fully closed and then fully open. The perceived position outputs (on green wire) as a 1-5V signal to use by others, for monitoring or positioning other devices.
Upon power failure, the motor will be returned to its’ starting open or closed position by the valve spring.
General Actuator Specifications
Supply: 24Vac +10%/-5%, 60Hz/50Hz
Motor Type: AC hysteresis brushless
Nominal Consumption: 6 Watts (9vA)
Ambient operating temperature: 0-50ºC (120ºF)
Typical opening (closing) time: 25 seconds
Signal output: 1-5Vdc +/- .1V impedance 100Kohms.
0 V is perceived as loss of power,
1V represents actuator in up position
5V represents actuator in down position
Output force: 28lbs (120N)
Motor jam recovery: if an unexpected stall occurs – i.e. in midrange – the
system reverses the motor, backs up, and then again attempts to move to the
calculated position
Position feedback (internal): Quadrature optical encoder
Drift: no detectable drift after 100,000 cycles Re-span (standard): after power
up as follows: drive to full closed. Reset count to zero. Allow (controlled) spring
return to full open, store span count, and then assume set point
Operating modes: proportional, time proportional, floating
Input Protection: inputs will accept 30Vac continuously without damage.
Misconnection (mixing) of the connections to unit will not cause damage
Wiring Connection: 32" PVC or optional Plenum cable
Agency approval: Conforms to CE/ROHS requirements
Class 2 as per UL/CSA