MITSUBISHI ELECTRIC FR-S520E - Manual (Page 103)

93
Current detection function parameters
2
F
UNCT
IO
NS
2.5.2 Zero current detection (Pr. 50 , Pr. 51 )
Use Pr. 64 or Pr. 65 (output terminal function selection) to assign the terminal used for
Y13 signal output.
When the inverter's
output current falls
to "0[A]", torque will
not be generated.
This may cause a
gravity drop when
the inverter is used
in vertical lift
application.
To prevent this, the output current "zero" signal can be output from the inverter
to close the mechanical brake when the output current has fallen to "0[A]".
Parameter Name
Factory
Setting
Setting
Range
Remarks
50 Zero current detection level 5% 0 to 200% Setting is enabled when
Pr. 30 = "1" 51 Zero current detection period 0.5s 0.05 to 1s
POINT
If the output is lower than the Pr. 50 setting for longer than the time set in Pr.
51 during inverter operation, the zero current detection (Y13) signal is output
from the inverter's open collector output terminal or contact output terminal.
Parameter Description
50
Set the zero current detection level.
Set the level of zero current detection in terms of the percentage of the rated
inverter current from the output current value of 0 [A].
51
Set the zero current detection period.
Set a period of time from when the output current falls to or below the Pr. 50
setting to when the zero current detection signal (Y13) is output.
CAUTION
•If the current falls below the preset detection level but the timing condition is
not satisfied, the zero current detection signal is held on for about 100ms.
•When the terminal functions are changed using Pr. 64, Pr. 65, the other
functions may be affected. Please make setting after confirming the function
of each terminal.
•When running (connecting) multiple motors with one inverter in due order, the
zero current detection signal (Y13) may be output. Set 13% or more for the 0.1K
and 8% or more for the 0.2K.
(when the total capacity of motors is less than the zero current detection level
and the motor capacity per inverter is less than the zero current detection level)
♦Related parameters♦
•
Assignment of Y13 signal to terminal ⇒ Pr. 64 "RUN terminal function selection", Pr. 65 "A, B, C
terminal function selection" (refer to page 104)
ON
Start signal
OFF
Pr.50
Pr.51
detection period
OFF OFF
100ms
ON ON
Pr.51
detection period
Pr.50
"zero
current
detection
level"
Output
current 0 [A]
Zero current
detection signal
output (Y13)