9
▌
Precautions for use
z
Temperature
•
In order to protect the encoder (ABZO sensor), use the actuator so that the surface
temperature on the motor case does not exceed 80 °C (176 °F). If the surface temperature
on the motor case may exceed 80 °C (176 °F), improve the operating conditions such
as ambient temperature, operating speed, duty cycle and others. If the encoder (ABZO
sensor) temperature reaches the upper limit, the motor overheat protection alarm will
generate.
z
Operation
•
Operate an actuator in the range of the operating ambient temperature. If the actuator is
operated outside the operating ambient temperature, the viscosity of grease may change,
causing the thrust force to decrease.
•
Keep 20 m (65.6 ft.) or less for the wiring distance between the actuator and driver.
Exceeding 20 m (65.6 ft.) may cause the thrust force to decrease.
•
The holding torque is decreased by the current cutback function of the driver when the
actuator stops. When selecting the actuator, make sure the holding torque at standstill by
checking the catalog specification.
•
Do not use the electromagnetic brake as a safety brake. To use the electromagnetic brake
to hold the load in position, do so after the actuator operation is stopped.
•
Do not use the electromagnetic brake as a means to decelerate and stop the actuator.
The brake hub of the electromagnetic brake will wear significantly and the braking force
will drop. Since the power off activated type electromagnetic brake is equipped, it helps
maintain the position of the load when the power is cut off, but this brake cannot securely
hold the load in place.
•
Do not press the ball screw shaft against a load at the speed exceeding the maximum
push speed or the maximum push-motion return-to-home speed. The mechanical impact
may cause damage to the actuator. If the ball screw shaft was pressed at high speed, take
measures by referring to "10 Troubleshooting and remedial action" on p.31.
z
Inspection
•
Grease on the ball screw shaft may darken within a short time after the start of operation.
Refer to "8 Maintenance" on p.27, and wipe off the dirty grease to apply new grease.
•
If an abnormal noise (i.e., from deflection or interference) is generated while operating the
non-guide type actuator, the installation accuracy may have dropped. Stop the operation
and check the installation accuracy of the ball screw shaft.
