Maintenance Timer Alarm (Pr. 503, Pr. 504) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Useful functions
(5) Cooling fan life display
⋅ The cooling fan speed of 40% or less is detected and "FN" is displayed on the operation panel (FR-DU07) and
parameter unit (FR-PU04/FR-PU07). As an alarm display, Pr. 255 bit 2 is turned on and also an alarm is output to
the Y90 signal.
REMARKS
⋅ When the inverter is mounted with two or more cooling fans, the life of even one cooling fan is diagnosed.
CAUTION
⋅ For replacement of each part, contact the nearest Mitsubishi FA center.

4.26.3 Maintenance timer alarm (Pr. 503, Pr. 504)

When the cumulative energization time of the inverter reaches the parameter set time, the maintenance timer
Pr.497
page 239
output signal (Y95) is output.
Pr.516
This can be used as a guideline for the maintenance time of peripheral devices.
page 171
Parameter
Number
503 Maintenance timer
Maintenance timer alarm output
504
set time
⋅ The cumulative energization time of the inverter is stored into the EEPROM every hour and indicated in Pr. 503
Maintenance timer in 100h increments. Pr. 503 is clamped at 9998 (999800h).
⋅ When the Pr. 503 value reaches the time set in Pr. 504 Maintenance timer alarm output set time (100h increments), the
maintenance timer alarm output signal (Y95) is output.
⋅ For the terminal used for the Y95 signal output, assign the function by setting "95" (positive logic) or "195" (negative
logic) to any of Pr. 190 to Pr. 196 (output terminal function selection).
CAUTION
⋅ The cumulative energization time is counted every hour. The energization time of less than 1h is not counted.
⋅ When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions may be
affected. Please make setting after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196(output terminal function selection)
368
(MT) is displayed on the operation panel (FR-DU07).
Name Initial Value
First power ON
9998
(999800h)
Maintenance
timer
Pr.504
(Pr. 503)
OFF
Y95 signal
MT display
Refer to page 228
Setting Range
0 0 (1 to 9998)
0 to 9998
9999
9999
Set "0" in Pr.503
ON ON
Description
Display the cumulative energization time of
the inverter in 100h increments.
Reading only
Writing the setting of "0" clears the
cumulative energization time.
Set the time taken until when the
maintenance timer alarm output signal
(Y95) is output.
No function
Time