Mitsubishi Electronics FR-A700 ユーザーズマニュアル

Motor brake and stop operation

⋅ Make sure that the inverter is in External operation mode. (Refer to page 313 )

⋅ Select either Real sensorless vector 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 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.

⋅ Setting Pr. 270 = "11 or 13" disables E.OLT (stall prevention stop) during stop-on-contact control (with both RL and RT

signals ON).

⋅ To input the RT signal, set "3" in any of Pr.178 to Pr.184 (Input terminal function selection) to assign the function to the

terminal. To input the RL signal, set "0" in any of Pr.178 to Pr.184 (Input terminal function selection) to assign the function

to the terminal.

* When RL and RT are ON, Pr. 49 Second stall prevention operation frequency is invalid.

⋅ 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 reset this function and use 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 mode

shift to the stop-on-contact control mode.

Output frequency

Multi-speed

0 to 5V, 0 to 10V

4 to 20mA etc.

Pr. 6 setting

Stall prevention operation level

⎯

Pr. 22 setting

⎯

The smaller value set 

in either Pr. 22 or Pr. 48. 

* 

Torque limit level

Pr. 22 setting

⎯

Pr. 22 setting

⎯

Excitation current low speed 

scaling factor

⎯

⎯

The current is 

compensated for by Pr. 

275 (0 to 1000%) 

settings from normal 

operation.

Carrier frequency

Pr. 72 setting

Pr. 276 setting when output frequency is 3Hz or 

less (Pr. 72 when Pr. 276 = "9999")

Fast response current limit

⎯

Valid

⎯

Invalid