Current Average Value Monitor Signal (Pr. 555 To Pr. 557) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.26.4 Current average value monitor signal (Pr. 555 to Pr. 557)

The average value of the output current during
constant speed operation and the maintenance
timer value are output as a pulse to the current
average value monitor signal (Y93).
The pulse width output to the I/O module of the PLC
etc. can be used as a guideline due to abrasion of
machines and elongation of belt and for aged
deterioration of devices to know the maintenance
time.
The current average value monitor signal (Y93) is
output as pulse for 20s as 1 cycle and repeatedly
output during constant speed operation.
Parameter
Name
Number
555 Current average time
556 Data output mask time
Current average value
557 monitor signal output
reference current
The above parameters allow its setting to be changed during operation in any operation mode even if "0" (initial value) is set in Pr. 77 Parameter write
selection.
1) Data output mask time
When the speed has changed to constant
from acceleration/deceleration, Y93 signal is
not output for Pr. 556 time.
2) Start pulse
Output as Hi pulse shape for 1s (fixed)
Output current set in Pr. 555 time is averaged.
3) Output current average value pulse
The averaged current value is output as low pulse shape for
0.5 to 9s (10 to 180%) during start bit output.
Signal output time=
⋅ The pulse output of the current average value monitor signal (Y93) is shown above.
⋅ For the terminal used for the Y93 signal output, assign the function by setting "93" (positive logic) or "193" (negative
logic) to any of Pr. 190 to Pr. 194 (output terminal function selection). (The function can not be assigned to Pr. 195 ABC1
terminal function selection and Pr. 196 ABC2 terminal function selection.)
(1) Setting of Pr. 556 Data output mask time
The output current is unstable (transient state) right after the operation is changed from the acceleration/
deceleration state to the constant speed operation. Set the time for not obtaining (mask) transient state data in Pr.
556.
(2) Setting of the Pr. 555 Current average time
The average output current is calculated during Hi output of start bit (1s). Set the time taken to average the current
during start bit output in Pr. 555.
Initial Value
1s
0s
55K or less
Rated inverter
current
75K or more
From acceleration to constant speed operation
Y93 signal
output current average value (A)
5s
Pr. 557 (A)
PLC
Output
unit
maintenance
time
parts have
reached their life
Setting Range
0.1 to 1.0s
0.0 to 20.0s
0 to 500A
0 to 3600A
Output
frequency
1 cycle (20s) Next cycle
5) End pulse
output as low pulse
shape for 1 to 16.5s
4) Maintenance timer pulse
The maintenance timer value (Pr. 503) is output
as Hi output pulse shape for 2 to 9s (16000h to
72000h).
Pr. 503 100h
Signal output time=
40000h
Useful functions
Input
unit
Inverter
Description
Set the time taken to average
the current during start pulse
output (1s).
Set the time for not obtaining
(mask) transient state data.
Set the reference (100%) for
outputting the signal of the
current average value.
Time
5s
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