YASKAWA SGDV-OFB03A Product Manual page 54

Set-up Procedure
Safety Precautions
54
CAUTION!
Design the system to ensure safety even when problems, such as broken
signal lines, occur. For example, the P-OT and N-OT signals are set in
the default settings to operate on the safe side if a signal line breaks. Do
not change the polarity of this type of signal.
– When overtravel occurs, the power supply to the motor is turned OFF
and the brake is released. If you use the Servomotor to drive a ver-
tical load, set the Servomotor to enter a zero-clamped state after the
Servomotor stops. Also, install safety devices (such as an external
brake or counterweight) to prevent the moving parts of the machine
from falling.
– Always turn OFF the servo before you turn OFF the power supply. If
you turn OFF the main circuit power supply or control power supply
during operation before you turn OFF the servo, the Servomotor will
stop as follows:
– If you turn OFF the main circuit power supply during operation
without turning OFF the servo, the Servomotor will stop abruptly
with the dynamic brake or it will coast to a stop.
– If you turn OFF the control power supply during operation without
turning OFF the servo, the Servomotor will stop abruptly with the
dynamic brake or it will coast to a stop. For details, refer to the
manual for the SERVOPACK.
– If you use an External Dynamic Brake Resistor, the Servomotor
stopping method will be different from when the built-in dynamic
brake resistor is used. For details, refer to the product manual for
your SERVOPACK.
– Do not use the dynamic brake for any application other than an emer-
gency stop.
There is a risk of failure due to rapid deterioration of elements in the
SERVOPACK and the risk of unexpected operation, machine
damage, burning, or injury.
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Sigma-5 and Sigma-7 Series SERVOPACKs