Stop-On-Contact Control - Mitsubishi Electric 800 Series Instruction Manual

5.14.5

Stop-on-contact control

To ensure accurate positioning at the upper limit, etc. of a
lift, stop-on-contact control causes the mechanical brake to
close while the motor creates a holding torque to keep the
load in contact with a mechanical stopper, etc.
This function suppresses vibration that is likely to occur
when the load is stopped upon contact in lift applications,
thereby ensuring reliable and highly accurate positioning
stop.
Pr. Name
6 Multi-speed setting (low
D303 speed)
22 Stall prevention
H500 operation level
48 Second stall prevention
H600 operation level
Stop-on contact/load
270 torque high-speed
A200 frequency control
selection
Stop-on contact
275
excitation current low-
A205
speed multiplying factor
276 PWM carrier frequency at
A206 stop-on contact

The setting range of FR-A860-01080 or lower

The setting range of FR-A860-01440 or higher
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.
<Without stop-on-contact control>
Vibration
Initial Setting
value range
10 Hz 0 to 590 Hz Set the output frequency for stop-on-contact control.
150% 0 to 400%
Set the stall prevention operation level for stop-on-contact control.
The smaller value set in either Pr.22 or Pr.48 has priority.
150% 0 to 400%
0 Normal operation
1 Stop-on-contact control
2 Load torque high-speed frequency control (Refer to
Stop-on contact + load torque high speed frequency control (Refer to
3
0
page 466)
11 Stop-on-contact control
Stop-on contact + load torque high speed
13 frequency control
(Refer to
Set the force (holding torque) for stop-on-contact control.
0 to 300%
Normally, set it from 130 to 180%.
9999
9999 No compensation.
0 to 9 Set a PWM carrier frequency for stop-on-contact control.

For Real sensorless vector control, the carrier frequency is always 2
kHz when the setting value is 0 to 5 and always 6 kHz when the
9999 0 to 4

setting value is 6 to 9. (Valid at the output frequency of 3 Hz or less.)
9999 As set in Pr.72 PWM frequency selection.
MC
Mechanical
brake
U
R/L1
V
S/L2
Motor
W
T/L3
STF
RH∗
RM∗
RL∗
RT∗
SD
(A) Application parameters
Magnetic flux Sensorless Magnetic flux Magnetic flux Sensorless Sensorless
<With stop-on-contact control>
Complete stop
Lift
Description
page 466.)
Normal 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 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)
PARAMETERS
Lift
page 466.)
E.OLT is invalid under
stop-on-contact control
Stop-on contact
control mode
5
Time
(c)
GROUP
A
ON
∗
ON
463