Mitsubishi Electric FR-A700 Technical Manual page 331

(2) Inrush limit circuit life display [Pr. 256]
The life of the inrush current limit circuit (relay,
contactor and inrush resistance) is displayed in [Pr.
259] .
The number of contact (relay, contactor, thyristor) ON
times is counted. It is counted down from 100% (used
0 time and 1,000,000 times left) at every 1% (at every
10,000 times). When the count reaches 10% (used
900,000 times and 100,000 times left), [Pr. 255] bit 3
is turned ON and Y90 signal is output to notify the
life.
(3) Control circuit capacitor life display [Pr. 257]
The deterioration degree of the control circuit
capacitor is displayed in [Pr. 257] as a life.
The control circuit capacitor life is calculated from the
energization time and temperature according to the
operating status, 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 an alarm is
output to the Y90 signal.
(4) Main circuit capacitor life display [Pr. 258,
259]
The deterioration degree of the main circuit capacitor
is displayed in [Pr. 258] as a life.
On the assumption that the main circuit capacitor
capacitance at factory shipment is 100%, the
capacitor life is displayed in [Pr. 258] every time
measurement is made. When the measured value
falls to or below 85%, [Pr. 255] bit 1 is turned ON and
also an alarm is output to the Y90 signal.
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 [Pr. 259 = 1] (measuring start)
3) Switch power OFF. The inverter applies DC
voltage to the motor to measure the capacitor
capacity while the inverter is OFF.
4) After making sure that the power lamp is OFF in
and LED on the operation panel is OFF
A700 F700
in , switch ON the power supply again.
E700 D700
5) Confirm that [Pr. 259 = 3] (measurement
complete), read
deterioration degree of the main circuit capacitor.
[P.259]
0 No measurement
1
Measurement start
2 During measurement
3
Measurement complete
Forced end
8
See (c), (g), (h), (i)
below.
Measurement error
9
See (d), (e), (f) below.
Do not measure in the following conditions. If
measured in the following conditions, "forced end"
[Pr. 259=8] or "measurement error" [Pr. 259=9] would
occur, or "measurement start" [Pr. 259=1] would
continues. Even when "measurement complete" [Pr.
259=3] appears in the following conditions, the
capacitor capacity is not measured correctly.
A700 F700
(a) FR-HC, MT-HC, FR-CV, or a sine wave filter is
connected.
(b) Terminal R1/L11, S1/L21 or DC power supply
is connected to terminal P/+ and N/-.
(c) Switching power ON during measuring.
(d) The motor is not connected to the inverter.
(e) The motor is running (coasting)
(f) The motor capacity is two rank smaller as
compared to the inverter capacity.
(g) The inverter is tripped or a fault occurred
when power is OFF.
(h) The inverter output is shut off with the MRS
signal.
(i) The start command is given while measuring.
E700 D700
(a) FR-HC or FR-CV is connected.
(b) DC power supply is connected to terminal P/+
and terminal N/-.
(c) Switching power ON during measuring.
(d) The motor is not connected to the inverter.
(e) The motor is running (coasting)
(f) The motor capacity is two rank smaller as
compared to the inverter capacity.
(g) The inverter is tripped or a fault occurred
when power is OFF.
(h) The inverter output is shut off with the MRS
signal.
(i) The start command is given while measuring.
(j) Parameter
connected.
365
PARAMETER
[Pr. 258], and check
Description Remarks
Initial value
Measurement
starts when the
power supply is
switched OFF.
Only displayed and
cannot be set
unit (FR-PU04/FR-PU07)
the
2
is