Mitsubishi Electric FR-E800, Instruction Manual

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8. (E) Environment Setting Parameters
8.18 Current average value monitor signal
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8.18
Current average value monitor signal
The output current average value during constant-speed operation and the maintenance timer value are output to the Current
average monitor (Y93) signal 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 seconds to the Current average monitor (Y93)
signal.
 Operation example
• The pulse output of the Current average monitor (Y93) signal is indicated below.
• For the terminal used for the Y93 signal output, assign the function by setting "93" (positive logic) or "193" (negative logic)
in any parameter of Pr.190, Pr.191, Pr.193 to Pr.196 (Output terminal function selection) . (This cannot be assigned by
setting in Pr.192 ABC 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 .
Programmable controller
Output
unit Input
unit
maintenance
time
parts have
reached their life
Inverter
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 second).
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
Inverter rated
current
0 to 500 A
Set the reference (100%) for outputting the output current
average value signal.
Y93 signal
Data output mask time
Start pulse
1 cycle (20 s)
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 9 s (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)
5 s
Signal output time=
5 s
40000h
Pr. 503 100h
output as low pulse
shape for 1 to 16.5 s
The maintenance timer value ( Pr. 503 ) is output
as Hi output pulse shape for 2 to 9 s (16000h to
72000h).
Output as Hi pulse shape for 1 s (fixed)
The output currents are averaged during the time
period set in
Pr.555 .