Stop-On Contact Control Function (Pr. 6, Pr. 48, Pr. 270, Pr. 275, Pr. 276) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

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

Magnetic flux Magnetic flux Sensorless Magnetic flux Sensorless Sensorless
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
6
(low speed)
Stall prevention
22
operation level
Second stall
48 prevention
operation current
Stop-on contact/
load torque high-
270
speed frequency
control selection
Stop-on contact
excitation current
275
low-speed
multiplying factor
PWM carrier
276 frequency at stop-
on contact
<Connection and operation example>
Sink logic
MCCB
Power
supply
Forward rotation command
High-speed operation command
Middle-speed operation command
Stop-on contact selection 0
Stop-on contact selection 1
* The input terminal used differs according to the Pr. 180 to Pr. 189 settings.
Initial
Setting Range
Value
10Hz 0 to 400Hz
150% 0 to 400%
150% 0 to 220%
0
1
0
2
3
0 to 1000%
9999
9999
55K or less 0 to 9 Set a PWM carrier frequency for stop-on-contact control.
9999 75K or more 0 to 4
9999
MC
R/L1
U
S/L2
V
T/L3
W
STF
RH *
RM *
RL *
RT *
SD
Motor brake and stop operation
<Without stop-on-contact control>
Vibration Complete stop
Lift
Description
Set the output frequency for stop-on-contact control.
Set the stall prevention operation level for stop-on-contact
control.
The smaller value set in either Pr. 22 or Pr. 48 has a priority.
Normal operation
Stop-on-contact control
Load torque high speed frequency control (Refer to page
357)
Stop-on-contact+load torque high speed frequency control
(Refer to page 357)
Set the force (holding torque) for stop-on-contact control.
Normally set 130% to 180%.
Valid only during advanced magnetic flux vector control
No compensation.
For real sensorless vector control, carrier frequency is
always 2Hz when a setting value is 0 to 5 and always 6Hz
when a setting value is 6 to 9. (Valid at the frequency of
3Hz or less.)
As set in Pr. 72 PWM frequency selection .
Normal mode Stop-on contact
Pr. 4
Mechanical
brake
Pr. 5
Pr. 6
0
Motor
(a) (b)
RH ON
RM
OFF
RL OFF
RT
OFF
Goes into stop-on-contact control mode when
both RL and RT switch on.
*RL and RT may be switched on in any order
with any time difference
(a):Acceleration time (Pr. 7 )
(b):Deceleration time (Pr. 8 )
(c):Second deceleration time (Pr. 44/Pr. 45 )
<With stop-on-contact control>
Lift
control mode
Time
(c)
ON
ON
*
ON
205
4