YASKAWA Sigma-7S Series Product Manual page 87

6.1 Alarms Related to the Dynamic Brake Hardware Option Specifications
6.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.730:
Dynamic Brake
Overload
(An excessive
power consump-
tion by the
dynamic brake
was detected.)
6-4
Possible Cause
The Servomotor was
rotated by an external
force.
When the Servomotor
was stopped by applying
the dynamic brake, the
rotational or linear kinetic
energy exceeded the
allowable energy con-
sumption of the dynamic
brake resistor.
The external dynamic
brake resistor is not con-
nected properly.
Pn601 (Dynamic Brake
Resistor Allowable Energy
Consumption) and Pn604
(Dynamic Brake Resis-
tance) are not set cor-
rectly.
A failure occurred in the
SERVOPACK.
Confirmation
Implement measures to
Check the operation ensure that the motor will
status. not be rotated by an
external force.
Reconsider the following:
• Reduce the Servomotor
• Decrease the moment
Use the monitor to
check the allowable
energy consumption of
• Reduce the frequency of
the dynamic brake
resistor.
• Select a suitable exter-
Connect the selected
Check the connection
dynamic brake resistor
status.
correctly.
Check to confirm that
the allowable energy
consumption and
resistance of the con- Set Pn601 (Dynamic
nected dynamic brake Brake Resistor Allowable
resistor match the set- Energy Consumption) and
tings of Pn601 Pn604 (Dynamic Brake
(Dynamic Brake Resis- Resistance) to the correct
tor Allowable Energy values.
Consumption) and
Pn604 (Dynamic Brake
Resistance).
The SERVOPACK may be
– faulty. Replace the SER-
VOPACK.
Continued from previous page.
Correction
–
command speed.
of inertia ratio or mass
ratio.
–
stopping with the
dynamic brake.
nal dynamic brake resis-
tor.
–
page 7-3
–
Refer-
ence