Mitsubishi Electric FR-A700 Technical Manual page 305

Stall Prevention
Operation
Fast
Selection
Response
[Pr. 156]
Current
: Activated
Limit : Not activated
Setting
*1
: Activated
: Not activated
24
25
26
27
28
29
30
31
100
*5
101
*5
*1 During fast-response current limit operation, OL signal is
output in but not output in
A700 F700
*2 When "Operation not continued at OL signal output" is
selected, the "
is displayed at OL operation and inverter trips.
*3 Stall prevention does not operate during fast-response
current limit operation in
E.OLT are not output. However, OL signal and E.OLT are
output when regeneration avoidance function (refer to
page 340) is active.
*4 Since both fast-response
prevention are not activated, OL signal and E.OLT are
not output. However, OL signal and E.OLT are output
when regeneration avoidance function (refer to page
340) is active.
*5 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.
(6) Output voltage reduction during stall
prevention operation [Pr. 154]
When [Pr. 154 = 0], the output voltage decreases
during stall prevention operation. By making setting
to reduce the output voltage, an overcurrent trip can
further become difficult to occur.
Use this function where a torque decrease will not
pose a problem.
OL Signal
Output
: Operation Continued
: Operation is not
*2
Continued
A700 F700
—
*3
E700 D700
—
*4
—
*4
—
*4
.
E700 D700
" (stopped by stall prevention)
, so the OL signal and
E700 D700
current limit and stall
A700 F700
[Pr. 154]
Setting
0
1
(initial value)
(7) Stall prevention operation signal output
and output timing adjustment (OL signal)
[Pr. 157]
common
When the output current exceeds the stall prevention
operation level and stall prevention is activated,
(overcurrent stall) is displayed and the stall
prevention operation signal (OL signal) is ON for
longer than 100ms. When the output current falls to
or below the stall prevention operation level, the
output signal turns OFF. When using
signal is output during fast-response current limit
operation. (OL signal is not output during fast-
response current limit operation in
Use [Pr. 157 OL signal output timer] to set whether the
OL signal is output immediately or output if stall
prevention is continuously activated after the preset
time.
This operation
overvoltage stall
regeneration avoidance function
stall) are performed.
If the frequency has fallen to 0.5Hz* by stall
prevention operation and remains for 3s, a fault
(E.OLT) appears and trips the inverter.
* 1Hz for
E700 D700
[Pr. 157] Setting
0
(initial value)
0.1 to 25
9999
Overload state
(OL operation
OL output signal
339
PARAMETER
Description
Output voltage reduced
Output voltage not reduced
A700 F700
.)
E700 D700
is also performed when
prevention operation
(overvoltage
.
Description
Output immediately.
Output after the set time (s) has
elapsed.
Not output.
[Pr.157] set time (s)
, OL
2
the
and