Mitsubishi Electric FR-A500 Instruction Manual page 184

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
<Setting>
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:
Parameter
Name
Number
Multi-speed setting (low
6
speed)
Second stall prevention
48
operation current
Stop-on-contact excitation
275 current low-speed
multiplying factor
Stop-on-contact PWM
276
carrier frequency
• Function switch-over when stop-on-contact control is selected
Operation Mode
(External)
RL, RT terminals
Main function
Multi-speeds
Output frequency for a
0 to 5V, 0 to 10V
stop-on-contact
4 to 20mA
Stall prevention operation Pr. 22 (stall prevention
level operation level)
Excitation current low-
speed multiplying factor
Pr. 72 "PWM frequency
Carrier frequency selection"
(0 to 15)
High-response current limit
Setting
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.
0 to 400Hz
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.
0 to 200% Set the stall prevention operation for stop-on-contact control.
Usually set a value between 130% and 180%.
0 to 1000%
Set the force (holding torque) for stop-on-contact control.
9999 No compensation
Set a PWM carrier frequency for stop-on-contact control.
0 to 15
(Valid at the frequency of 3Hz or less)
9999 Conforms to the Pr. 72 "PWM carrier frequency selection".
Ordinary Operation
RL RT
Either is OFF
Pr. 6 "low-speed frequency"
Pr. 48 (second stall prevention operation
current)
The current is compensated for by the
multiplying factor (0 to 1000%) set in
Pr. 275 before RL and RT are switched
on.
Pr. 276 (stop-on-contact PWM carrier
frequency)
(0 to 15, 9999)
Yes
Description
Stop-on-Contact Control
RL RT
ON ON
No
175
PARAMETERS
Remarks
When RL and RT are on,
Pr. 49 (second stall prevention
operation frequency) is invalid.
4