6-20
Setting Pr5.13 Over-speed level setup and Pr6.15 2nd over-speed level setup
In a specific condition, the motor will not stop normally when the immediate stop function
is activated.
For example, as shown below, when the motor speed exceeds Pr5.13 Over-speed level
setup, and immediate stop function is activated, the motor speed cannot be controlled.
As a safety measure against over-speed, Err26.1 (2nd over-speed protection) is provid-
ed. Because Err26.1 is an immediate stop unsupported alarm, it shuts off motor current
and stops the motor by following sequence operation B of alarm process. In Pr6.15 2nd
over-speed level setup, set the allowable over-speed level.
Set Pr5.13 to the lower value compared with that of Pr6.15 to have sufficient margin.
When both settings are the same or margin is small, Err26.0 and Err26.1 may be detect
-
ed at the same time. In this case Err26.0 is displayed, but because Err26.1 is also gener
-
ated internally, immediate stop unsupported alarm is given priority and immediate stop is
not performed.
Furthermore, if the setup value of Pr6.15 is lower than that of Pr5.13, Err26.1 is gener-
ated before Err26.0, disabling immediate stop.
Time
Motor speed
velocity
command
Alarm
Not generated
Generated
Err26.0 (Immediate stop supported alarm)
Err26.1 (Immediate stop unsupported alarm)
is internally generated.
Flowing
Normal operation
(according to command from host)
Turned off
Sequence at alarm
Immediate
stop
operation
Current
<For current off>
2nd over-speed level setup
(Pr6.15)
<For immediate stop>
Over-speed level setup
(Pr5.13)
Speed
[r/min]
Operation following operation B
When the speed exceeds the speed set in
Pr6.15 2nd over-speed level setup, turns off
the current and operates according to
sequence operation B at alarm.
Related page
• P.4-6 to P.4-85... “Details of parameter”
1. When in Trouble
Protective function (Detail of error code)
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