Mitsubishi Electronics FR-A500 ユーザーズマニュアル

179

1) Select advanced magnetic flux vector control and set "1" or "3" in Pr. 270.

2) Refer to the following list and set the parameters:

• Function switch-over when stop-on-contact control is selected

Note: 1. By increasing the Pr. 275 setting, the low-speed (stop-on-contact) torque increases, but the

overcurrent alarm (E.OCT) may occur or the machine may oscillate in a stop-on-contact state.

2. 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, the function can cause the motor to overheat. After a stop,

immediately reset this function and use a mechanical brake to hold the load.

3. Under the following operating conditions, the stop-on-contact function is made invalid:

•PU operation
•Programmed operation
•PU + external operation
•PID control function operation
•Remote setting function operation
•Orientation control function operation
•Jog operation

6

Multi-speed setting (low 
speed)

0 to 400Hz

Set the output frequency for stop-on-contact control.
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 stop-on-contact control is to be exercised during encoder 
feedback control, encoder feedback control is made invalid when the 
inverter enters the stop-on-contact control mode.

48

Second stall prevention 
operation current

0 to 200%

Set the stall prevention operation for stop-on-contact control.

275

Stop-on-contact excitation 
current low-speed 
multiplying factor

0 to 1000%

Usually set a value between 130% and 180%.
Set the force (holding torque) for stop-on-contact control.

9999

No compensation

276

Stop-on-contact PWM 
carrier frequency

0 to 15

Set a PWM carrier frequency for stop-on-contact control.
(Valid at the frequency of 3Hz or less)

9999

Conforms to the Pr. 72 "PWM carrier frequency selection".

Output frequency for a 
stop-on-contact

Multi-speeds
0 to 5V, 0 to 10V
4 to 20mA

Pr. 6 "low-speed frequency"

Stall prevention operation 
level

Pr. 22 (stall prevention 
operation level)

Pr. 48 (second stall prevention operation 
current)

When RL and RT are on, 
Pr. 49 (second stall prevention 
operation frequency) is invalid.

Excitation current low-
speed multiplying factor

The current is compensated for by the 
multiplying factor (0 to 1000%) set in
Pr. 275 before RL and RT are switched 
on.

Carrier frequency

Pr. 72 "PWM frequency 
selection"
(0 to 15)

Pr. 276 (stop-on-contact PWM carrier 
frequency)
(0 to 15, 9999)

High-response current limit

Yes

No