Marwin Valve ER Series Electric Actuators - Manual (Page 4)

Notes:
Power to terminals one and two opens the valve (CCW
rotation).
Power to terminals one and three closes the valve (CW
rotation).
Terminals four and five are for light indication.
Wiring diagram illustrates the actuator in the open posi-
tion.
Typical wiring diagram. Specific wiring diagram inside
cover of each unit, or see Marwin website.
Maintenance
After your Marwin Valve electric actuator has been
properly installed there is little or no maintenance ever
required. The gear train has been permanently lubricated
at the factory and requires no routine maintenance. In
the event it becomes necessary to perform maintenance
on the actuator:
Turn off power to the actuator before removing the 1.
cover.
Place a lock out pad on the power source.
2.
Upon assembly we recommend lubrication using 3.
Lubriplate EMB grease.
Calibrate before placing back into hazardous loca-
4.
tion.
Rewire actuator before removing lock out pad.
5.
Remove lock out pad after cover is replace and se- 6.
cured.
Duty Cycle
Marwin actuators rated 100 lb-in up to 1500 lb-in output
torque are rated for 25% duty cycle at 100% ambient
temperature at rated torque (75% duty cycle motors are
available upon request). Actuators rated for 2000 lb-in
output torque and greater are rated for continuous duty.
All direct current (dc) motors are rated for 75% duty
cycle.
Thermal Overload
All alternating current (ac) motors are equipped with
thermal over load protection to guard the motor against
damage from overheating.
Mechanical Overload
Marwin actuators are all designed to withstand stall
conditions. It is not recommended to subject the unit to
repeated stall conditions; however, should it occur the
actuator would not experience gear damage.
Recommended Spare Parts
Two Position Actuators: Set of cams and switches.
Modulating Actuators: Set of cams, switches, feedback
potentiometer and a positioner card.
NEMA 7 Enclosure
In general, operation and maintenance of a NEMA 7
electric actuator is no different than that of a NEMA 4
electric actuator. However, there are some precautions
that must be followed.
DO NOT 1. install in ambient temperatures above
140°F.
DO NOT
2. under any circumstances remove the
actuator cover while in a hazardous location, this
could cause ignition of hazardous atmospheres.
DO NOT
3. under any circumstances use a NEMA 7
electric actuator in a hazardous location that does
not meet the specifications for which the actuator
was designed. The actuator is clearly tagged with
the NEMA classification it was designed for.
Mount, test and calibrate actuator on valve in non-
4.
hazardous location.
When removing the cover care must be taken not
5.
to scratch, scar or deform the flame path of the
cover or base of the actuator; this will negate the
NEMA 7 rating of the enclosure.
When replacing the cover on actuators rated
6.
NEMA 4 and 7 take care that the gasket is in place
to assure the proper clearance after the cover is
secured. After securing the cover screws check
the clearance between the cover and the base, a
0.002” thick by ½” wide feeler gauge may not enter
between the two mating faces more than 0.12”.
All electrical connections must be to state and local
7.
codes and in accordance with the specifications for
which the unit is being used.
After proper installation, the actuator will require little or
no maintenance. In the event maintenance is required,
remove it from the hazardous location before attempt-
ing to work on it. If the actuator is in a critical application
and down time is not permitted, it is advisable to have a
spare actuator in stock.
Warranty
Richards Industries (RI) warrants that for a period of
twelve months from the date of shipment it will either
repair or replace, at its option, any of its products, which
prove to be defective in material or workmanship. This
warranty does not cover damage resulting from causes
such as abuse, misuse, modification or tampering. This
warranty is extended only to the immediate purchaser
of RI’s product and is not transferable. To obtain service
-4-