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8 PARAMETER FUNCTIONS
8-29
8
8.5.4 Stopping operation
Initial value
Pr. 10 "braking voltage operation speed" 100
Pr. 11 "braking voltage operation time" 9999
Pr. Setting Range Unit Operation
10 40 to 200 r/min At the preset speed or less, the motor is stopped by voltage braking.
0.0 to 60.0 s
The voltage braking time is fixed to the preset value regardless of
the time required for the motor to stop. Setting "0" coasts the
motor to a stop at the Pr. 10 setting or less.
11
9999
The motor's terminal voltage is detected to adjust the voltage
braking time (0 to 3s) automatically.
Pr. 10
ON OFF
5 to 35ms
RUN signal
Running speed (r/min)
Coasting to stop
Voltage braking time
Time
The voltage braking time varies with the load inertia moment.
The guideline of the voltage braking time relative to the motor shaft-load inertia moment ratio is as
indicated below.
Moment ratio 5 times 38 times 77 times
Voltage braking time 50ms 250ms 600ms
Voltage braking operates as described below depending on the magnitude relationship with the
Pr. 13 [Section 8.5.1] "minimum motor speed" setting.
(1) If Pr. 13 setting is greater than Pr. 10 setting
•
Voltage braking operates when the speed falls to less than the Pr. 13 setting.
(2) If Pr. 13 setting is less than Pr. 10 setting
1) When deceleration started at start signal OFF
•
Voltage braking operates at less than the Pr. 10
setting.
•
When the running speed is between the Pr. 10 and
Pr. 13 settings, voltage braking operates as soon as
the start signal turns OFF.
ON
STF
0
Pr. 10
Pr. 13
Running
speed (r/min)
braking
Voltage
2) When deceleration started by reducing the operation
command value
•
Voltage braking operates at less than the Pr. 13
setting.
ONSTF
0
Pr. 10
Pr. 13
Voltage
Running
speed (r/min)
braking
MEMO
Voltage braking utilizes dynamic braking according to the motor's terminal voltage.
Therefore, at less than low-speed rotation (approx. 20r/min) the motor terminal
voltage becomes faint, the braking force does not work, the motor will coast to a
stop.
NOTICE
Use the Pr. 10 setting at 100r/min or more. If the value is set to less than 100r/min,
a large current may flow depending on the load, resulting in an alarm stop.