Stop-On Contact Control Function (Pr. 6, Pr. 48, Pr. 270, Pr. 275, Pr. 276) - Mitsubishi Electric 700 Series Instruction Manual

5.10.4 Stop-on contact control function (Pr. 6, Pr. 48, Pr. 270, Pr. 275, Pr. 276)

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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
Name
Number
Multi-speed setting (low
6
speed)
Second stall prevention
48∗
1
operation current
Stop-on contact control
270∗
1
selection
Stop-on contact
∗
275∗ excitation current low-
1, 2
speed multiplying factor
PWM carrier frequency at
276∗
1
stop-on contact
∗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.
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)
Initial
Setting Range
Value
10Hz 0 to 400Hz
0 to 200%
9999
9999
0
0 to 300%
9999
9999
0 to 9
9999
9999
Output
frequency
Normal mode Stop-on-contact control mode
Pr. 4
Pr. 5
Pr. 6
0
(a) (b)
RH
ON
RM
OFF ON
RL OFF
RT
OFF
* 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.
(a) Acceleration time (Pr. 7 )
(c) Second deceleration time (Pr. 44/Pr. 45 )
Motor brake and stop operation
<Without stop-on-contact control>
Vibration
Lift
Sets the output frequency for stop-on-contact control.
Sets the stall prevention operation level for stall
prevention operation level.
Pr. 22 setting
0 Normal operation
1 Stop-on-contact control
Set the force (holding torque) for stop-on-contact control.
Normally set 130% to 180%.
Without compensation
Sets a PWM carrier frequency for stop-on-contact control.
As set in Pr. 72 PWM frequency selection.
Time
(c)
ON
*
ON
(b) Deceleration time (Pr. 8 )
<With stop-on-contact control>
Complete
stop
Lift
Description
139
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