8
Series 70 Electric Actuator
Operation and Maintenance Manual
Field or Factory Installable Options
Torque Switches
Torque switches are a factory installed and calibrated
option available for all Series 70 units. Installation is
simple, but due to the requirement for special calibration
equipment, it is not recommended for field installation.
In fact, modifying the factory torque setting voids
the actuator warranty. Removal of the switchplate
invalidates factory calibration
The unique mechanism is extremely accurate and has
excellent repeatability. The worm is pinned to the worm
shaft, which is held in position with a stack of disc
springs at both ends. The torque transmitted through
the worm to the output worm gear acts directly against
the disc springs, which compress proportionately. The
worm and worm shaft shift longitudinally as a result.
A specially designed drive lever and pin is incorporated
into the worm, providing the profile for the torque
switching mechanism. A drive lever & pin rides in the
worm gear torque sensor groove, and in turn drives
a cam. The cam then actuates its electrical switch,
which interrupts the power to the motor winding when
the torque exceeds the setting. The motor can still be
powered to run in the opposite direction, the switch
will release automatically.
Switching Mechanism
Torque Switch Mechanism
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