Mitsubishi Electric FR-A800 Series Instruction Manual page 580

• 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 operation (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
Main functions
Output frequency
Stall prevention operation
level
Torque limit level
Excitation current low-speed
scaling factor
Carrier frequency
Fast-response current limit
*1 When RL and RT are ON, Pr.49 Second stall prevention operation frequency is invalid.
 Set frequency and validity of the stop-on-contact control (Pr.270 = "1, 3,
11, 13")
• 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).
Input signal
RH RM
ON
ON
ON
ON ON
ON ON
ON
ON
ON ON
ON
ON
ON
ON
ON
*1 By 0 to 5 V (0 to 10 V), 4 to 20 mA input
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Normal operation (Either RL or RT is OFF or both
Real sensorless vector
control
Multi-speed, 0 to 5 V, 0 to 10 V, 4 to 20 mA, etc.
—
Pr.22 setting
—
Pr.72 setting
—
Set
frequency
RL RT JOG
Pr.4
Pr.5
Pr.6
*1
ON
ON Pr.15
Pr.26
Pr.25
ON Pr.4
ON Pr.15
Pr.24
ON Pr.5
ON Pr.15
ON Pr.6
ON Pr.15
ON ON Pr.15
ON ON Pr.15
search engine
are OFF.)
Advanced magnetic flux
vector control
Pr.22 setting
—
Enabled
Stop-on-contact
control
RH RM
ON
ON
ON
ON
ON
ON
ON ON
ON ON
ON ON
ON
ON
ON ON
Enabled ON ON
ON ON
ON ON
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
Input signal
Set
frequency
RL RT JOG
ON ON Pr.15
ON ON Pr.15
ON ON Pr.6
ON ON Pr.15
ON ON Pr.15
ON ON Pr.6
ON Pr.15
ON Pr.26
ON Pr.27
ON ON ON Pr.15
ON ON ON Pr.15
ON ON Pr.15
ON ON Pr.15
ON ON Pr.6
ON ON ON Pr.15
*1
5.14 (A) Application parameters
1
2
3
4
5
6
vector control
7
*1
8
9
10
Stop-on-contact
control
Enabled
Enabled
Enabled
579
5. PARAMETERS