xxi
Maintenance and Inspection Precautions
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 following manual.
Σ-7-Series Σ-7S/Σ-7W SERVOPACK with Dynamic Brake Hardware Option Specifications Product Manual
(Manual No.: SIEP S800001 73)
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.
When you adjust the gain during system commissioning, use a measuring instrument to monitor
the torque waveform and speed waveform and confirm that there is no vibration.
If a high gain causes vibration, the Servomotor will be damaged quickly.
Do not frequently turn the power supply ON and OFF. After you have started actual operation,
allow at least one hour between turning the power supply ON and OFF (as a guideline).
Do not use the product in applications that require the power supply to be turned ON and OFF
frequently.
The elements in the SERVOPACK will deteriorate quickly.
An alarm or warning may occur if communications are performed with the host controller while
the SigmaWin+ or Digital Operator is operating.
If an alarm or warning occurs, it may interrupt the current process and stop the system.
With this product, set the same Servomotor stopping method for both axis A and axis B.
If the Servomotor stopping methods are different, the machine may be damaged.
Set appropriate values for the correction amounts in the Position Correction Table.
The machine may be damaged if the correction amounts are too large.
Do not change any wiring while power is being supplied.
There is a risk of electric shock or injury.
Wiring and inspections must be performed only by qualified engineers.
There is a risk of electric shock or product failure.
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