Mitsubishi Electric 800 Series Instruction Manual page 465

(A) Application parameters
Setting the stop-on-contact control
• Make sure that the inverter is in External or Network operation mode. (Refer to
• Select either Real sensorless vector control (speed control) or Advanced magnetic flux vector control.
• Set "1, 3, 11 or 13" in Pr.270 Stop-on contact/load torque high-speed frequency control selection.
• Set the output frequency for stop-on-contact control in Pr.6 Multi-speed setting (low speed).
Set the frequency as low as possible (about 2 Hz). If a frequency higher than 30 Hz is set, it operates with 30 Hz.
• When both the RT and RL signals are switched ON, the inverter enters the stop-on-contact control, and operation is
performed at the frequency set in Pr.6 independently of the preceding speed.
• Setting Pr.270 = "11 or 13" disables stall prevention stop (E.OLT) during stop-on-contact control (with both RL and RT
signals ON).
NOTE
• By increasing the Pr.275 setting, the low-speed (stop-on-contact) torque increases, but overcurrent fault (E.OC[]) may occur
or the machine may oscillate in stop-on-contact status.
• The stop-on-contact function is different from the 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 switch 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 (Pr.292), Start time tuning, Orientation control
function operation
• When performing stop-on-contact control during encoder feedback control, encoder feedback control is invalid due to a
transition to the stop-on-contact control mode.
Function switching of stop-on-contact control selection
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.
464
PARAMETERS
Normal operation
(either RL or RT is OFF or both are OFF)
Real sensorless
vector control
Multi-speed, 0 to 5 V, 0 to 10 V 4 to 20 mA, etc.
— Pr.22 setting
Pr.22 setting —
—
Pr.72 setting
— Enabled
Advanced
Real sensorless
magnetic flux
vector control
vector control
Pr.6 setting
—
Pr.22 setting
The current is compensated by Pr.275 (50 to
300%) setting from normal operation.
When output frequency is 3 Hz or lower,
Pr.276 setting (Pr.72 when Pr.276 = "9999")
—
page 291.)
Stop-on-contact control
(both RL and RT are ON)
Advanced
magnetic flux
vector control
The smaller value set in
either Pr.22 or Pr.48.
—
Disabled
