Mitsubishi Electric 700 Series, Instruction Manual

Page: 147 / 416

136
Function assignment of external
terminal and control
(2) Zero current detection (Y13 signal,
Pr. 152, Pr.
153, Pr. 167 )
⋅
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 output current zero signal (Y13) can be output from the
inverter to close the mechanical brake when the output
current has fallen to "0".
⋅
When Pr.167 = "10" or "11", turning Y13 signal ON stops the
inverter output and causes output current detection fault
(E.CDO) to be displayed. ON status of Y13 signal is held for
0.1s at the fault. Setting
Pr. 167 = "10" or "11" while Y13
signal is ON does not cause E.CDO. Setting to Pr. 167
becomes effective after Y13 is turned OFF.
⋅
For the Y13 signal, set "13 (positive logic)" or "113 (negative
logic)" in any of
Pr. 190 to Pr. 196 (output terminal function
selection) to assign the function to the output terminal.
CAUTION
⋅
The response time of Y12 and Y13 signals is approximately 0.1s. Note that the response time changes according to the load
condition.
When
Pr. 152 = "0", detection is disabled.
⋅
Changing the terminal assignment using
Pr. 190 to Pr. 196 (output terminal function selection)
may affect the other functions.
Please set parameters after confirming the function of each terminal.
CAUTION
The zero current detection level setting should not be too low, 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.
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.
♦
Parameters referred to
♦
Pr. 190 to Pr. 196 (output terminal function selection) Refer to page 128
OFF ON
Start signal
Time
Output
current
OFF
ON Zero current
detection time
(Y13)
Pr. 153
Detection time
Pr. 153
Detection time
Pr.152
OFF
ON
0[A]
0.1s
*
Pr.152
* Once turned ON, the zero current detection time
signal (Y13) is held ON for at least 0.1s.
Pr. 167
= 0 or 1