Mitsubishi Electric FR-A700 Technical Manual page 363

Confirm that the External operation mode is selected. In
, select Real sensorless vector control or Advanced
A700
magnetic vector control. This function is not activated
during V/F control and vector control.
In , select Advanced magnetic flux vector control or
E700
General-purpose magnetic vector control. This function is
not activated during V/F control.
In , set [Pr. 270 Stop-on contact/load torque high-speed
A700
frequency control selection=1 or 3]. In
on contact control selection =1].
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 enters the stop-on-contact mode, in which
operation is performed at the frequency set in [Pr. 6]
independently of the preceding speed.
Under Advanced magnetic flux vector control and General-
purpose magnetic flux control, increasing the [Pr. 275]
setting enhances excitation at the low speed and increases
torque. Normally set this parameter within the range about
130 to 180%. If the setting is too large, overcurrent fault
(E.OC 1 to 3) 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 hold the load by a mechanical brake.
Under the following operating conditions, the stop-on-
contact function is invalid:
A700
Main Functions
Output frequency
Stall prevention operation
level
Torque limit level
Excitation current low
speed scaling factor
Carrier frequency
Fast-response current
limit
* When RL and RT are ON, [Pr. 49 Second stall prevention operation frequency] is invalid.
, set [Pr. 270 Stop-
E700
Normal Operation
(either RL or RT is OFF or both are OFF)
Advanced
Real sensorless
magnetic flux vector
vector control
Multi-speed
0 to 5V, 0 to 10V
4 to 20mA etc.
— [Pr. 22] setting
[Pr. 22] setting
—
[Pr. 72] setting
—
• 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])
• Start time tuning (only in
• Orientation control function operation (only in
When performing stop-on-contact control during encoder
feedback control, encoder feedback control is invalid due
to a mode shift to the stop-on-contact control mode.
Normal mode Stop-on contact
[Pr. 4]
[Pr. 5]
[Pr. 6]
0
(a)
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])
With Stop-on-contact Control
Real sensorless
vector control
control
—
— [Pr. 22] setting
—
Output frequency is 3Hz or less
[Pr. 276] setting ([Pr. 72] when [Pr. 276 = 9999])
Valid —
397
PARAMETER
)
A700
control mode
Time
(b) (c)
ON
ON
*
ON
(both RL and RT are ON)
Advanced
magnetic flux vector
control
[Pr. 6] setting
The setting value of [Pr.
48] or [Pr. 22],
whichever is smaller
—
[Pr. 275] (0 to 1000%)
is compensated from
normal operation
Invalid
)
A700
2
*