(7)
To further prevent a trip (Pr.154)
Set Pr.154 = "11" when the overvoltage protective function (E.OV
application with large load inertia. Note that turning OFF the start signal (STF/STR) or varying the frequency signal during
stall prevention operation may delay the acceleration/deceleration start.
(8)
Limit the stall prevention operation and fast-response current limit operation according to the
operating status (Pr. 156)
Refer to the following table and select whether stall prevention operation and fast-response current limit operation will be
performed or not and the operation to be performed at OL signal output.
Stall Prevention
Operation Selection
Fast-Response
: Activated
: Not activated
Current Limit
Pr. 156
Setting
: Activated
: Not activated
0
(initial
value)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
100
When "Operation not continued for OL signal output" is selected, the
Since stall prevention is not activated, OL signal and E.OLT are not output.
The settings "100" and "101" allow operations to be performed in the driving and regeneration modes, respectively. The setting "101" disables the fast-
response current limit in the driving mode.
OL signal is not output at fast-response current limit operation.
The fast-response current limit operation is disabled under IPM motor control.
NOTE
When the load is heavy or the acceleration/deceleration time is short, stall prevention is activated and acceleration/
deceleration may not be made according to the preset acceleration/deceleration time. Set Pr. 156 and stall prevention
operation level to the optimum values.
In vertical lift applications, make setting so that the fast-response current limit is not activated. Torque may not be
produced, causing a load drop due to gravity.
Adjustment of the output torque (current) of the motor
OL Signal
Output
:Operation
continued
: Operation
not continued
—
—
—
) activates during stall prevention operation in an
Stall Prevention
Operation Selection
Fast-Response
: Activated
: Not activated
Current Limit
Pr. 156
Setting
: Activated
: Not activated
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
101
fault (stopped by stall prevention) is displayed and operation is stopped.
OL Signal
Output
:Operation
continued
: Operation
not continued
—
—
—
4
99