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Useful functions
4.26.4 Current average value monitor signal (Pr. 555 to Pr. 557)
⋅ 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 cannot 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 pulse (1s). Set the time taken to average the
current during start pulse output in Pr. 555.
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
programmable controller 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
Number
Name Initial Value Setting Range Description
555 Current average time 1s 0.1 to 1.0s
Set the time taken to average
the current during start pulse
output (1s).
556 Data output mask time 0s 0.0 to 20.0s
Set the time for not obtaining
(mask) transient state data.
557
Current average value
monitor signal output
reference current
Rated inverter
current
55K or lower 0 to 500A
Set the reference (100%) for
outputting the signal of the
current average value.
75K or higher 0 to 3600A
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.
Programmable controller
Output
unit
Input
unit
maintenance
time
parts have
reached their life
Inverter
Y93 signal
1) Data output mask time
2) Start pulse
1 cycle (20s)
3) Output current average value pulse
Next cycle
Time
Output
frequency
From acceleration to constant speed operation
Signal output time=
output current average value (A)
Pr. 557 (A)
5s
4) Maintenance timer pulse
Signal output time=
5s
40000h
5) End pulse
The averaged current value is output as low pulse shape for
0.5 to 9s (10 to 180%) during start pulse output.
When the speed has changed to constant
from acceleration/deceleration, Y93 signal is
not output for Pr. 556 time.
Pr. 503 100h
output as low pulse
shape for 1 to 16.5s
The maintenance timer value (Pr. 503) is output
as Hi output pulse shape for 2 to 9s (16000h to
72000h).
Output as Hi pulse shape for 1s (fixed)
The output currents are averaged during the time
period set in Pr.555.