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

Motor brake and stop operation

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

Magnetic flux Magnetic flux Magnetic flux Sensorless 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,
positioning.
Parameter
Name
Number
Multi-speed setting
6
(low speed)
Stall prevention
22
*1
operation level
Second stall
48 prevention
operation current
Stop-on contact/
270
load torque high-
speed frequency
control selection
Stop-on contact
excitation current
275
*2
low-speed
multiplying factor
PWM carrier
276 frequency at stop-
on contact
*1 This parameter allows its setting to be changed during operation in any operation mode even if "0 (initial value) or 1" is set in Pr. 77 Parameter write
selection.
*2 This parameter allows its setting to be changed during operation even if "0" (initial value) is set in Pr. 77 Parameter write selection.
.............Specifications differ according to the date assembled. Refer to page 484 to check the SERIAL number.
<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.
214
ensuring steady precise
Initial
Setting Range
Value
10Hz 0 to 400Hz
150% 0 to 400%
150% 0 to 220%
0
1
2
0
3
11
13
0 to 1000%
9999
9999
55K or lower
9999 75K or higher 0 to 4
9999
MC
R/L1
U
S/L2
V
T/L3
W
STF
RH *
RM *
RL *
RT *
SD
<Without stop-on-contact control>
Vibration
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 374)
Stop-on-contact+load torque high speed frequency control
(Refer to page 374)
Stop-on-contact control
Stop-on-contact+load torque high speed
frequency control (Refer to page 374)
Set the force (holding torque) for stop-on-contact control.
Normally set 130% to 180%.
No compensation.
0 to 9 Set a PWM carrier frequency for stop-on-contact control.
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 .
Pr. 4
Mechanical
brake
Pr. 5
Pr. 6
0
Motor
(a)
RH
RM
RL
RT
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>
Complete stop
Lift
Description
E.OLT invalid under
stop-on-contact
control
Normal mode Stop-on contact
control mode
Time
(b) (c)
ON
OFF ON
OFF ON
*
OFF ON
Lift