Mitsubishi FR-A800

(E) Environment setting parameters
PARAMETERS
283
5
GROUP
E
5.7.20 Current average value monitor signal
 Initial value for the FR-A820-03160(55K) or lower and FR-A840-01800(55K) or lower.
 Initial value for the FR-A820-03800(75K) or higher and FR-A840-02160(75K) and higher.
Operation example
• The pulse output of Current average monitor signal (Y93) is indicated below.
• For the terminal used for Y93 signal output, assign the function by setting "93 (positive logic)" or "193 (negative logic)" in
any of Pr.190 to Pr.194 (output terminal function selection). (This cannot be assigned by setting in Pr.195 ABC1
terminal function selection or Pr.196 ABC2 terminal function selection.)
Pr.556 Data output mask time setting
• Immediately after acceleration/deceleration is shifted to constant-speed operation, the output current is unstable
(transitional state). Set the time for not obtaining (masking) transitional state data in Pr.556.
Pr.555 Current average time setting
• The output current average is calculated during start pulse (1 s) HIGH output. Set the time for calculating the average
current during start pulse output in Pr.555.
The output current average value during constant-
speed operation and the maintenance timer value are
output to the current average value monitor signal
(Y93) as a pulse. The output pulse width can be used
in a device such as the I/O unit of a programmable
controller as a guideline for the maintenance time for
mechanical wear, belt stretching, or deterioration of
devices with age.
The pulse is repeatedly output during constant-speed
operation in cycles of 20 s to the Current average
monitor signal (Y93).
Pr. Name Initial value Setting range Description
555
E720
Current average time
1 s 0.1 to 1 s
Set the time for calculating the average
current during start pulse output (1 s).
556
E721
Data output mask time
0 s 0 to 20 s
Set the time for not obtaining (masking)
transitional state data.
557
E722
Current average value
monitor signal output
reference current
Rated
inverter
current
0 to 500 A

Set the reference (100%) for outputting
the output current average value signal.
0 to 3600 A

Programmable controller
Output
unit
Input
unit
maintenance
time
parts have
reached their life
Inverte
r
Y93 signal
Data output mask time
Start pulse
1 cycle (20s)
Output current average value pulse
Next cycle
Time
Output
frequency
From acceleration to constant speed operation
Maintenance timer pulse
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.
Signal output time=
output current average value (A)
Pr. 557 (A)
5s
Signal output time=
5s
40000h
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.