Setting The Stop-On-Contact Control; Function Switching Of Stop-On-Contact Control Selection - Mitsubishi FR-A800 Instruction Manual

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
(either RL or RT is OFF or both are OFF)
Main functions
Real sensorless
Output frequency Multi-speed, 0 to 5 V, 0 to 10 V 4 to 20 mA, etc.
Stall prevention operation
—
level
Torque limit level Pr.22 setting
Excitation current low-
—
speed scaling factor
Carrier frequency Pr.72 setting
Fast-response current
—
limit

When RL and RT are ON, Pr.49 Second stall prevention operation frequency is invalid.
Normal operation
Advanced
magnetic flux
vector control
vector control
Pr.22 setting
—
Enabled
(A) Application parameters
page 306.)
Stop-on-contact control
(both RL and RT are ON)
Real sensorless
magnetic flux
vector control
vector control
Pr.6 setting
The smaller value set in
—
either Pr.22 or Pr.48.
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")
— Disabled
PARAMETERS
Advanced

5
GROUP
A
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