xxi
Operation Precautions
W
A
RNING
Before starting operation with a machine connected, change the settings of the switches and
parameters to match the machine.
Unexpected machine operation, failure, or personal injury may occur if operation is started before
appropriate settings are made.
Do not radically change the settings of the parameters.
There is a risk of unstable operation, machine damage, or injury.
Install limit switches or stoppers at the ends of the moving parts of the machine to prevent
unexpected accidents.
There is a risk of machine damage or injury.
For trial operation, securely mount the Servomotor and disconnect it from the machine.
There is a risk of injury.
Forcing the motor to stop for overtravel is disabled when the Jog, Origin Search, or Easy FFT
utility function is executed. Take necessary precautions.
There is a risk of machine damage or injury.
When an alarm occurs, the Servomotor will coast to a stop or stop with the dynamic brake
according to the SERVOPACK Option and settings. The coasting distance will change with the
moment of inertia of the load and the resistance of the External Dynamic Brake Resistor. Check
the coasting distance during trial operation and implement suitable safety measures on the
machine.
Do not enter the machine’s range of motion during operation.
There is a risk of injury.
Do not touch the moving parts of the Servomotor or machine during operation.
There is a risk of injury.
C
A
UTION
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 vertical 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 cir-
cuit 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.
•
If you turn OFF the control power supply without turning OFF the servo, the stopping method that is
used by the Servomotor depends on the model of the SERVOPACK. For details, refer to the manual
for the SERVOPACK.
•
If you use a SERVOPACK with the Dynamic Brake Hardware Option, the Servomotor stopping meth-
ods will be different from the stopping methods used without the Option or with other Hardware
Options. For details, refer to the
Σ
-7-Series AC Servo Drive
Σ
-7S/
Σ
-7W SERVOPACK with Dynamic
Brake Hardware Option Specifications Product Manual
.
Do not use the dynamic brake for any application other than an emergency 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.
