Electric Actuator Model EJM0 pages

ONE HAYWARD INDUSTRIAL DRIVE CLEMMONS, NC 27012 PHONE (336)-712-9900 FAX (336) 712-9518

WARNING: FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS INJURY OR DEATH.

INSTRUCTION MANUAL FOR HAYWARD CONTROLS EJM SERIES ELECTRIC ACTUATORS (110, 220 or 24 VAC & 12 or 24 VDC)

This Instruction manual contains important information regarding the installation, operation and troubleshooting of EJM Series Electronic Actuators. Please read these instructions carefully and save them for future reference.

DESCRIPTION EJM Series Electric Actuators are designed to provide reliable and efficient operation of final control elements, such as 1/4 turn valves, with torque requirements up to 3500 inch pounds. EJM Series actuators are available as AC models with duty cycles of 25% or 75% and DC models with a 100% duty cycle. >

GENERAL TECHNICAL INFORMATION

EJM Series AC voltage actuators use a split phase motor which internally steps up the applied 115 AC voltage and feeds it back to the off terminal. For example, when 115 VAC power is applied at terminals 1 and 4, 230 volts will be fed back to terminal 3. This can create a problem for controllers with solid state outputs rated for less than 230 VAC. It is suggested that the cleanӔ contacts provided be used for solid state device feed back. >

Additionally, due to this feed back, multiple actuators cannot be wired in parallel, and individual leads (isolated contacts) must be run to each actuator .

It is important to verify that the output torque of the actuator is appropriate for the torque requirements of the valve and that the actuator duty cycle is appropriate for the intended application. >

DUTY CYCLE

Exceeding the actuator's rated duty cycle may cause the thermal overload switch to temporarily shut off power to the motor. A 25% duty cycle means that for every operating cycle that the actuator is ON (to open or close the valve), the actuator must be OFF for a time equal to three operating cycles. For example, an operating cycle time of 5 seconds ON, it must be OFF for 15 seconds before it is again operated. A 75% duty cycle means that for every operating cycle that the actuator is ON, the actuator must be OFF for 1/3 of a cycle. >

TEMPERATURE LIMITS

Low ambient temperatures : The minimum recommended ambient temperature is -23 F. Care should be used in selecting actuators for valves for services below 40 а F as lower temperatures can affect valve torque. Please consult factory for actuator sizing. High ambient temperatures : The maximum recommended ambient temperature is 140 F with the actuator shaded from direct sunlight. >
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