Mitsubishi Electric 800 Series Instruction Manual page 265

(E) Environment setting parameters
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%. As soon as the control circuit capacitor life falls below 10%, Pr.255 bit 0 is turned ON and also a
warning is output to the Y90 signal
Life display of the main circuit capacitor (Pr.258, Pr.259) (Standard
models)
POINT POINT
• 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, Pr.255 bit 1 is turned ON and also a warning is
output to the Y90 signal.
• 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 power lamp is OFF, turn ON the power again.
5) Check that "3" (measurement complete) is set in Pr.259, read Pr.258, and check the deterioration degree of the main
circuit capacitor.
Pr.259
0 No measurement
1 Measurement start
2 During measurement
3 Measurement complete
8 Forced end
9 Measurement error
NOTE
• When the main circuit capacitor life is measured under the following conditions, "forced end" (Pr.259 = "8"), or "measurement
error" (Pr.259 = "9") may occur, or the status may remain in "measurement start" (Pr.259 = "1"). To perform measurement,
first eliminate the following conditions. Under the following conditions, even if "measurement complete" (Pr.259 = "3") is
reached, measurement cannot be performed correctly.
- Terminals R1/L11, S1/L21 or DC power supply is connected to terminals P/+ and N/-.
- The power supply is switched ON during measurement.
- The motor is not connected to the inverter.
- The motor is running (coasting).
- The motor capacity is smaller than the inverter capacity by two ranks or more.
- The inverter is tripped or a fault occurred while the power was OFF.
- The inverter output is shut off with the MRS signal.
- The start command is given while measuring.
- The applied motor setting is incorrect.
• Operation environment: surrounding air temperature (annual average of 40°C (free from corrosive gas, flammable gas, oil
mist, dust and dirt)).
Output current (80% of the inverter rating)
• Since repeated inrush currents at power ON will shorten the life of the converter circuit, frequent starts and stops of the
magnetic contactor must be avoided.
WARNING
 When measuring the main circuit capacitor capacity (Pr.259 = "1"), the DC voltage is applied to the
motor for about 1 s at power OFF. Never touch the motor terminal, etc. right after powering OFF to
prevent an electric shock.
264
PARAMETERS
Description REMARKS
Initial value
Measurement starts when the power supply is switched OFF.
Only displayed and cannot be set.