BRAY Series 70 Electric Actuator
Operation and Maintenance Manual
20
S70 SerVO PrO trOubleShOOting chart Refer to the Servo Pro Operation Manual for more information.
PrObleM POSSible cauSe SOlutiOnS
Actuator moves back and forth near
setpoint (hunts)
Signal is uctuating beyond deadband
setting
Increase the deadband using the Deadband
trim pot.
Signal has interference Shield signal from interference
Actuator does not travel fully open
or fully closed
Travel limit switches are not set correctly Set travel limit switches for 90° operation
Servo DIP switches are not set correctly See Quick Setup Instructions on page 5
Mechanical travel stops are not set
correctly
Set mechanical travel stops for 90° operation
Actuator motor does not run and
green servo power light is off
Power is disconnected Connect power
Actuator motor does not run and
green servo power light is on
Limit switches or torque switches are
triggered
Ensure that there is continuity between the two
wires going to each switch
Handwheel is engaged Push handwheel in (disengage)
Servo is not wired correctly Check servo wiring to all points
Motor has thermally tripped Allow motor to cool down
Actuator does not properly respond
to command signal
Potentiometer gear is not engaged Engage and adjust pot. gear
Command signal DIP switch selection
is not correct
Set the DIP switches correctly
Command signal polarity is incorrect Wire the command signal correctly
Actuator runs in one direction only
Wiring is incorrect Correct Wiring
Potentiometer wired backwards
Reverse white and gray wires, see wiring diagram
inside cover
Limit switch or torque switch is triggered
Ensure that there is continuity between the wires
coming from the switches. If your actuator has
reached its travel limit, reverse direction. If one
of your torque switches has tripped, reverse the
actuator direction and correct the over torque
condition.
Command signal DIP switch selection
is not correct
Set the DIP switches correctly
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