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133
Motor brake and stop operation
4.10.4 Stop-on contact control function (Pr. 6, Pr. 48, Pr. 270, Pr. 275, Pr. 276)
∗1
This parameter can be set when
Pr. 160 User group read selection
= "0".
∗2
This parameter allows its setting to be changed during operation even if "0" (initial value) is set in
Pr. 77 Parameter write selection
.
(1) Connection and operation example
(2) Set stop-on-contact control
Make sure that the inverter is in External operation mode.
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.
For the terminal used for X18 signal input, set "3" in any of
Pr. 178 to Pr. 184 (input terminal function selection)
and "0" in
Pr. 178
to Pr. 184 (input terminal function selection)
to assign the function.
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
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
Stop-on contact control
selection
0
0
Normal operation
1
Stop-on-contact control
275
,
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
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 (JOG signal), PU+External operation
(Pr. 79)
, PID control function operation
(Pr.
128)
, 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
Power supply
Forward rotation command
High-speed operation command
Middle-speed operation command
Stop-on contact selection 0
Stop-on contact selection 1
MCCB
R/L1
S/L2
T/L3
STF
RH*
RM*
RL*
RT*
SD
U
V
W
MC
Mechanical
brake
Motor
Sink logic
(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
)
∗
ON
OFF
ON
OFF
ON
OFF
ON
∗
Goes into stop-on-contact control when both RL and RT switch ON.
RL and RT may be switched on in any order with any time difference.
∗
The input signal terminal used differs according to the
Pr. 180 to Pr. 184
settings.
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