To p r e v e n t i g n i t i o n o f h a z a r d o u s a t m o s p h e r e s ,
d o n o t r e m o v e a c t u a t o r c o v e r w h i l e c i r c u i t s a r e l i v e .
SURE 49
5
O p e r a t i o n
Power On:
The electric motor drives the gear train, which in turn winds the spring and turns the device. An internal limit
switch de-energizes the motor and the brake, which holds the return spring and device in position.
Power Off:
When the current is interrupted by either a control signal or a power failure, the return spring drives the device to its
original position.
N o t e :
It is recommended that the actuator be driven electrically in both directions for normal operation to prolong cycle life.
M a i n t e n a n c e
Gear train is permanently lubricated at the factory for the average life of the actuator. Brake gap is set at the factory. No further
attention is required.
T h e r m a l O v e r l o a d
The internal thermal overload switch de-energizes the motor and prevents overheating of the motor windings due to
excessive operation, stalling or high ambient temperatures.
D u t y C y c l e
The maximum duty-cycle to be expected without interruption by thermal cut-off at an ambient temperature of 65C˚ is 25%
(3 “OFF” times for every 1 “ON” time) for the 5 and 10 second design, and 50% (1 “OFF” time for every 1 “ON” time) for
the 30 second design.
S t o r a g e
The Surepowr actuator must be stored in a clean, dry, temperature controlled building which is protected from the weather.
Precautions shall be taken to prevent condensation inside or outside the actuator. If there is insufficient external
temperature and humidity control, internal heaters must be installed and energized to protect the unit against condensation
from extreme temperature variations. The actuators shall be stored off the floor on suitable pallets and must be covered
with an unsealed dust protector allowing side and bottom ventilation.
Tr o u b l e s h o o t i n g ( N e w U n i t )
N o t e :
Most actuator problems occur due to incorrect cam/travel limit switch setting, or the use of an external travel stop on the
device that the actuator is operating.
Problem 1:
Actuator is receiving electric power but the motor does not respond.
Instructions:
1a.
Check actuator nameplate to insure correct model, voltage type and spring return direction.
1b. Check all wiring against installation wiring diagram.
1c.
Actuator with clockwise fail position:
Using a volt meter, check that power is available between
terminals 1 and 2. Then check the voltage between terminal 1 (common) and the two legs of the
motor and capacitor. The meter should indicate a value = to or greater than the supply voltage
indicated on the actuator nametag.
Actuator with counter-clockwise fail position:
Using a volt meter, check that power is available
between terminals 1 and 3. Then check the voltage between terminal 1 (common) and the two legs of
the motor and capacitor. The meter should indicate a value = to or greater than the supply voltage
indicated on the actuator nametag.
If power is not present at the motor or capacitor leads:
•
Cam adjustments are required
•
Switch malfunction
•
Improper wiring
SURE 49
