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PARAMETERS
5
Motor brake and stop operation
5.10.4 Stop-on contact control function (Pr. 6, Pr. 48, Pr. 270, Pr. 275, Pr. 276)
∗1 These parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 167)
∗2 These parameters allow their settings to be changed during operation even if "0" (initial value) is set in Pr. 77 Parameter write selection.
(1) Operation example
(2) Set stop-on-contact control
Make sure that the inverter is in the Network operation mode. (Refer to page 50)
Select Advanced magnetic flux vector control or General-purpose magnetic flux vector control.
Set "1" in Pr. 270 Stop-on contact control selection.
Set output frequency during stop-on-contact control in
Pr. 6 Multi-speed setting (low speed)
.
The frequency should be as low as possible (about 2Hz). If it is set to more than 30Hz, the operating frequency will be 30Hz.
When both the RT and RL signals are switched ON, the inverter starts the stop-on-contact control, in which operation is
performed at the frequency set in Pr. 6 independently of the preceding speed.
To ensure accurate positioning at the upper limit etc. of a
lift, stop-on-contact control causes a mechanical brake to
be closed while the motor is developing a holding torque
to keep the load in contact with a mechanical stopper etc.
This function suppresses vibration which is liable to occur
when the load is stopped upon contact in vertical motion
applications, ensuring steady precise positioning.
Parameter
Number
Name
Initial
Value
Setting Range Description
6
Multi-speed setting (low
speed)
10Hz 0 to 400Hz Sets the output frequency for stop-on-contact control.
48∗1
Second stall prevention
operation current
9999
0 to 200%
Sets the stall prevention operation level for stall
prevention operation level.
9999 Pr. 22 setting
270∗1
Stop-on contact control
selection
0
0 Normal operation
1 Stop-on-contact control
275∗1, ∗2
Stop-on contact
excitation current low-
speed multiplying factor
9999
0 to 300%
Set the force (holding torque) for stop-on-contact control.
Normally set 130% to 180%.
9999 Without compensation
276∗1
PWM carrier frequency at
stop-on contact
9999
0 to 9 Sets a PWM carrier frequency for stop-on-contact control.
9999 As set in Pr. 72 PWM frequency selection.
NOTE
By increasing the Pr. 275 setting, the low-speed (stop-on-contact) torque increases, but overcurrent fault (E.OCT) may
occur or the machine may oscillate in a stop-on-contact state.
The stop-on-contact function is different from servo-lock function, and if used to stop or hold a load for an extended
period, this function can cause the motor to overheat.
After a stop, immediately change to a mechanical brake to hold the load.
Under the following operating conditions, the stop-on-contact function is invalid:
PU operation (Pr. 79), Jog operation, remote setting function operation (Pr. 59), automatic acceleration/deceleration
operation (Pr. 292)
AD
MFVC
AD
MFVC
AD
MFVC
GP
MFVC
GP
MFVC
GP
MFVC
<Without stop-on-contact control> <With stop-on-contact control>
Vibration
Lift
Complete
stop
Lift
(a) (b) (c)
Time
Pr. 4
RH
RM
RL
RT
Pr. 5
Pr. 6
Output
frequency
0
Normal mode
Stop-on-contact control mode
(a) Acceleration time (Pr. 7 ) (b) Deceleration time (Pr. 8 )
(c) Second deceleration time (Pr. 44/Pr. 45 )
*
ONOFF
ONOFF
ONOFF
ON
* Goes into stop-on-contact control when both RL and RT switches are
ON.
RL and RT may be switched ON in any order with any time difference.