Mitsubishi Electric FR-A700 Technical Manual page 80

(1) Output current detection(Y12)
The output current detection function can be used for
excessive torque detection, etc.
If the output current remains higher than the [Pr. 150]
setting during inverter operation for longer than the
time set in [Pr. 151], the output current detection
signal (Y12) is output from the inverter's open
collector or relay output terminal.
After Y12 turns ON, ON status is held for 0.1s in
. ON status is held for the set time in [Pr.166]
in
D700 E700
When [Pr. 166 = 9999], the ON state is held until a
next start.
When [Pr. 167 = 1], the inverter output is stopped and
the output current detection alarm (E.CDO) is
displayed when the Y12 signal turns ON. When an
alarm stop occurs, the Y12 signal is on for the time
set in [Pr. 166] at the [Pr. 166 ≠ 9999], and remains on
until a reset is made at the [Pr. 166 = 9999]. E.CDO
does not occur even if [Pr. 167 = 1] while Y12 is ON.
The [Pr. 167] setting is made valid after the Y12 turns
OFF.
For the Y12 signal, set 12 (positive logic) or 112
(negative logic) in [Pr. 190 to Pr. 196 Output terminal
function selection] and assign functions to the output
terminal.
[Pr. 166 9999], [Pr. 167 = 0]
[Pr. 150]
Output current
Output current
OFF
detection signal
(Y12)
1.4.21 Output torque detection (TU)
[Pr. ] Name
864 Torque detection
When the output torque reaches or exceeds the detected
torque value set in [Pr. 864] under Advanced magnetic flux
vector control, Real sensorless vector control, or vector
control, the torque detection signal (TU) turns ON. It turns
OFF when the torque falls below the detection torque
value.
The signal is used as operation and open signal for an
electromagnetic brake.
For the TU signal, set 35 (positive logic) or 135 (negative
logic) in [Pr. 190 to Pr. 196 Output terminal function selection]
and assign functions to the output terminal.
common
.
[Pr. 151]
Time
[ Pr. 166 ]
Minimum 0.1s
(initial value)
OFF
ON
A700
(A700)
Initial Value
150%
(2) Zero current detection (Y13)
If the output current remains lower than the [Pr. 152]
setting during inverter operation for longer than the
time set in [Pr. 153], the zero current detection (Y13)
signal is output from the inverter's open collector or
relay output terminal.
When the inverter's output current falls to 0, torque
will not be generated. This may cause a drop due to
gravity when the inverter is used in vertical lift
application.
To prevent this, the Y13 signal can be output from the
inverter to close the mechanical brake when the
output current has fallen to 0.
Once turned ON, the zero current detection time
(Y13) signal is held on for at least 100ms.
For the Y13 signal, set 13 (positive logic) or 113
(negative logic) in [Pr. 190 to Pr. 196 Output terminal
function selection] and assign functions to the output
terminal.
Output
current
0[A]
OFF
Start signal
Zero current
detection time
(Y13)
*1 This function is also valid during execution of the online
or offline auto tuning.
*2 The response time of Y12 and Y13 signals is
approximately 350ms.
*3 The zero current detection level setting should not be too
high, and the zero current detection time setting not too
long. Otherwise, the detection signal may not be output
when torque is not generated at a low output current.
*4 To prevent the machine and equipment from resulting in
hazardous conditions by use of the zero current detection
signal, install a safety backup such as an emergency
brake.
Setting Range
Set the torque value where the TU signal
0 to 400%
turns ON.
[Pr.864]
TU
73
SPECIFICATIONS
common
[Pr.152]
0.1s
Time
ON
OFF OFF
ON ON
[ ] [ ]
Pr. 153 Pr. 153
Description
Time
ON OFF
1