Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 263 / 608

Parameter Motor brake and stop operation
FR-E700 SC EC/ENE 6 - 109
Set stop-on-contact control
●
Make sure that the inverter is in external operation mode. (Refer to section 6.18.1.)
●
Select advanced magnetic flux vector control or general-purpose magnetic flux vector control.
●
Set "1" in Pr. 270 "Stop-on contact 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 2 Hz). If it is set to more than 30 Hz, the
operating frequency will be 30 Hz.
●
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.
●
For the terminal used for X18 signal input, set "3" in any of Pr. 178 to Pr. 184 "Input terminal
function selection" and "0" in Pr. 178 to Pr. 184 "Input terminal function selection" to assign the
function.
Function switching of stop-on-contact control selection
NOTES
By increasing the Pr. 275 setting, the low-speed (stop-on-contact) torque increases, but overcur-
rent 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, immedi-
ately change to a mechanical brake to hold the load.
Under the following operating conditions, the stop-on-contact function is made invalid:
앫
PU operation (Pr. 79)
앫
Jog operation (JOG signal)
앫
PU+external operation (Pr. 79)
앫
PID control function operation (Pr. 128)
앫
remote setting function operation (Pr. 59)
앫
automatic acceleration/deceleration operation (Pr. 292)
Main Functions
Normal Operation
(either RL or RT is off or both are off)
With Stop-on-contact Control
(both RL and RT are on)
Output frequency
Multi-speed
0 to 5 V/0 to 10 V/4 to 20 mA etc.
Pr. 6
Stall prevention operation level Pr. 22
Pr. 48
(Pr. 22 when Pr. 48 = 9999)
Excitation current low speed scaling
factor
—
Only Pr. 275 (0 to 300%) is compen-
sated from normal operation
Carrier frequency Pr. 72
Pr. 276 setting when output
frequency is 3 Hz or less
(Pr. 72 when Pr. 276 = 9999)
Fast-response current limit Valid Invalid
Tab. 6-24: Function switching of stop-on-contact control selection