Mitsubishi Electric 800 Series Instruction Manual page 40

• 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 is turned ON (set to 1) 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, 11" (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, 13" (measurement complete) is set in Pr.259, read Pr.258, and check the deterioration
degree of the main circuit capacitor.
Pr.259 Description
0 No measurement
1, 11 Start measurement
2, 12 During measurement
3, 13 Measurement complete
8, 18 Forced end
9, 19 Measurement error
NOTE
• When the main circuit capacitor life is measured under the following conditions, "forced end" (Pr.259 = "8, 18"), or
"measurement error" (Pr.259 = "9, 19") may occur, or the status may remain in "measurement start" (Pr.259 = "1,
11"). To perform measurement, first eliminate the following conditions. Under the following conditions, even if
"measurement complete" (Pr.259 = "3, 13") is reached, measurement cannot be performed correctly.
- FR-HC2, FR-CV, MT-RC, or a sine wave filter (MT-BSL/BSC) is connected.
- 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 output is shut off 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, 11"), the DC voltage is applied to the motor for about 1
second at power OFF. Never touch the motor terminal, etc. right after powering OFF to prevent an electric shock.
Remarks
Initial value
Measurement starts when the power supply is
switched OFF. (Only once when Pr.259 = "1")
When Pr.259 = "11", the measurement starts every
time the power supply is turned OFF.
Only displayed and cannot be set.
(When "11" is set in Pr.259, "12, 13, 18, or 19" is
displayed.)
4 BCN-C22005-914