Mitsubishi Electric 800 Series Instruction Manual page 157

• When the parts have reached the life alarm output level, the corresponding bits of Pr.255 turns ON. The ON/OFF state of
the bits can be checked with Pr.255. The following table shows examples.
Pr.255
Decimal Binary
879 1101101111
5 101
0 0
○: Parts reaching alarm output level ×: Parts not reaching alarm output level
• The Life alarm (Y90) signal turns ON when the warning level is reached for either of the following: the control circuit
capacitor life, main circuit capacitor life, cooling fan life, inrush current limit circuit life, the estimated residual-life of the main
circuit capacitor, relay contacts of terminals A, B, and C, inverter module, or control circuit board.
• For the terminal used for the Y90 signal, set "90" (positive logic) or "190" (negative logic) in any parameter from Pr.190 to
Pr.196 (Output terminal function selection).
NOTE
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
• For replacement of each part, contact the nearest Mitsubishi FA center.
 Life display of the inrush current limit circuit (Pr.256)
• The life of the inrush current limit circuit (relay, contactor and inrush resistor) is displayed in Pr.256.
• The number of contact (relay, contactor, thyristor) ON times is counted, and it is counted down from 100% (0 time) every
1%/10,000 times. When the counter reaches 10% (900,000 times), bit 3 of Pr.255 is turned ON (set to 1) and the Y90
signal is also output as an alert.
 Life display of the control circuit capacitor (Pr.257)
• The deterioration degree of the control circuit capacitor is displayed in Pr.257.
• In the operating status, the control circuit capacitor life is calculated from the energization time and temperature, and is
counted down from 100%. When the counter goes down from 10%, bit 0 of Pr.255 is turned ON (set to 1) and the Y90
signal is also output as an alert.
 Life display of the main circuit capacitor (Pr.258, Pr.259)
• For accurate life measurement of the main circuit capacitor, wait three hours or longer after turning OFF. The temperature left
in the main circuit capacitor affects measurement.
• The deterioration degree of the main circuit capacitor is displayed in Pr.258.
• With the main circuit capacitor capacity at factory shipment as 100%, the capacitor life is displayed in Pr.258 every time
measurement is made. When the measured value falls to 85% or lower, bit 1 of Pr.255 turns ON and the Y90 signal is also
output as an alert.
• Measure the capacitor capacity according to the following procedure and check the deterioration degree of the capacitor
capacity.
1.
Check that the motor is connected and at a stop.
2.
Set "1" (measuring start) in Pr.259.
3.
Switch the power OFF. The inverter applies DC voltage to the motor to measure the capacitor capacity while the
inverter is OFF.
4.
After confirming that the LED of the operation panel is OFF, power ON again.
156
7. (E) Environment Setting Parameters
7.15 Inverter parts life display
bit 9 bit 8 bit 7 bit 6
○ ○ × ○
× × × ×
× × × ×
bit 5 bit 4 bit 3 bit 2
○ × ○ ○
× × × ○
× × × ×
bit 1 bit 0 Remarks
All parts have reached
○ ○
alarm output level.
Control circuit capacitor
and cooling fan have
× ○
reached alarm output
level.
No parts have reached
× ×
alarm output level.