6
BRAY Series 74 Electric Actuator
Operation and Maintenance Manual
Problem Possible cause Solutions
Motor does not operate
Check supply power and voltage are correct.
Check by meter.
Any blisters on the capacitor? If so replace.
Is the gear train locked-up? Remove motor to check.
Motor stops running Is power supply short circuited? Check wiring.
Any foreign objects in pipeline? Check for obstructions.
Unable to fully open/close Loose/Misaligned cam? Adjust/Tighten using wrench.
Bent valve stem? Replace valve stem.
Mechanical stop adjustment incorrect?
Check position of stops.
Valve stops operating when motor Gear worn out? Replace gear.
is running. Sleeve adapter worn out or broken? Replace sleeve adapter.
Broken valve stem or actuator Replace valve stem or actuator
transmission shaft. transmission shaft?
Abnormal control for operating two or Controlling circuit connected in Refer to the wiring diagram.
more actuators simultaneously. tandem or parallel?
Motor overheats. Incorrect voltage? Check by meter.
Valve torque too high? Replace with larger actuator.
High working frequency? Check duty cycle.
Is motor stem or bearing binding? Replace the binding parts.
Occasional on/off actuator failure. Simultaneous input power on/off. Check if the selection switch is
normal.
Vibration when valve is closed. Motor brake spring fatigued or Replace spring or Teflon.
Teflon worn?
ACTUATOR TROUBLESHOOTING CHART
LUBRICATION
The gearbox of the Bray actuator is enclosed, and it has
already been lubricated sufficiently with high tempera-
ture lubricant at the factory sufficient for use for up to two
years.
IMPORTANT NOTICES & MAINTENANCE
Notices:
1. Make sure the voltage is correct before power-up.
2. Turn power off before conducting any mainte-
nance.
3. Seal the casing and conduit entrance after wiring
to prevent dust or water contamination.
4. The angle of electric actuator installation must
between 0~180 degree. Do not install upside
down or below the horizontal.
5. Do not install when hazardous or explosive gases
may be present.
6. The frequency of open and close operation is
restricted to every 5 minutes. Avoid too high a
cycle frequency.
7. When more than one electric actuator needs to
operate simultaneously, please connect with
individual cables & not in parallel.
8. Connect the ground wire to PE inside the electric
actuator.
9. The warranty period of our product is one year.
Storage:
1. The actuator should be placed in a clean and dry
place, and protected from the weather and
extreme vibration.
2. If actuator needs be stored outside, it must be
protected from excess moisture, dust, and
weather.
