Mitsubishi Electric FR-F700 Series Instruction Manual page 87

Inspection Item
(1) Display of the life alarm
· Pr. 255 Life alarm status display can be used to confirm that the control circuit capacitor, main circuit capacitor,
cooling fan, and each parts of the inrush current limit circuit has reached the life alarm output level.
bit 15 7
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
bit
Pr.255
(decimal) (binary)
15 1111
14 1110
13 1101
12 1100
11 1011
10 1010
9 1001
8 1000
7 0111
6 0110
5 0101
4 0100
3 0011
2 0010
1 0001
0 0000
POINT
Life check of the main circuit capacitor needs to be done by Pr. 259. (Refer to the following.)
(2) Measuring method of life of the main circuit capacitor
·
If the value of capacitor capacity measured before shipment is considered as 100%, Pr. 255 bit1 is turned on
when the measured value falls below 85%.
·
Measure the capacitor capacity according to the following procedure and check the deterioration level 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 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.
5) Check that "3" (measuring completion) is set in Pr. 259, then read Pr .255 and check the life of the main circuit
capacitor.
REMARKS
·
The life of the main circuit capacitor can not be measured in the following conditions.
(a) FR-HC, FR-CV, FR-BU, MT-HC, MT-RC, MT-BU5, or BU is connected.
(b) Terminal R1/L11, S1/L21 or DC power supply is connected to the terminals P/+ and N/−.
(c) Switch power on during measuring.
(d) The motor is not connected to the inverter.
(e) The motor is running.(The motor is coasting.)
(f) The motor capacity is two rank smaller as compared to the inverter capacity.
(g) The inverter is at an alarm stop or an alarm occurred while power is off.
(h) The inverter output is shut off with the MRS signal.
(i) The start command is given while measuring.
· Operating environment:Ambient temperature (annual average 40°C (104°F) (free from corrosive gas, flammable gas, oil
mist, dust and dirt))
Output current (80% of the rated current of Mitsubishi standard 4P motor)
POINT
For the accurate life measuring of the main circuit capacitor, perform after more than 3h passed since the turn off
of the power as it is affected by the capacitor temperature.
82
0
1
bit0 Control circuit capacitor life
bit1 Main circuit capacitor life
bit2 Cooling fan life
bit3 Inrush current limit circuit life
Inrush current Cooling
limit circuit life fan life
• Pr.255 read
Main circuit Control circuit
capacitor life capacitor life
: with alarm, : without alarm
• Pr.255 setting read
Bit image is displayed
in decimal