Mitsubishi Electric 800 Series Instruction Manual page 336

 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 or 11" in Pr.270 Stop-on-contact 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" 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 operation (Pr.292), Start time tuning
 Function switching of stop-on-contact control selection
Normal operation (Either RL or RT is OFF or both
Main functions
Real sensorless vector
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 —
 Set frequency and validity of the stop-on-contact control (Pr.270 = "1 or
11")
• The following table lists the frequencies set when the input terminals (RH, RM, RL, RT, JOG) are selected together.
• Stop-on-contact control is disabled when remote setting function is selected (Pr.59 = 1 to 3).
are OFF.)
Advanced magnetic flux
control vector control
Pr.22 setting
—
Enabled
page 180.)
Stop-on-contact control (Both RL and RT are ON.)
Real sensorless vector Advanced magnetic flux
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 (0% to 300%)
setting from normal operation.
When output frequency is 3 Hz or lower,
Pr.276 setting (Pr.72 when Pr.276 = "9999")
— Disabled
14.(A) Application Parameters
14.2 Stop-on-contact control
11
12
13
14
15
16
17
18
vector control
19
20
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