FE FRENIC-Multi series, Instruction Manual

Page: 172 / 196

7-6
Cooling fan
Select Menu #5 "Maintenance Information" and check the accumulated run time of the cooling fan.
The inverter accumulates hours for which the cooling fan has run. The display is in units of 1000
hours. The accumulated time should be used just a guide since the actual service life will be
significantly affected by the temperature and operation environment.
(2) Early warning of lifetime alarm
For the components listed in Table 7.3, you can get an early warning of lifetime alarm at one of the
transistor output terminals ([Y1] and [Y2]) and the relay contact terminals ([30A/B/C]) as soon as any
of the conditions listed under the "Judgment level" column has been exceeded. When the
replacement data of any parts exceeds the judgment level, this signal comes ON.
Table 7.3 Criteria for Issuing a Lifetime Alarm
Parts to be replaced Judgment level
DC link bus capacitor 85% or lower of the capacitance than that of the factory setting
Electrolytic capacitors on the
printed circuit boards 87000 hours or longer as accumulated run time
(estimated service life at the inverter’s ambient temperature of
40
°
C under 80% of full load)
Cooling fan 87000 hours or longer as accumulated run time
(estimated service life at the inverter’s ambient temperature of
40
°
C under 80% of full load)
7.4 Measurement of Electrical Amounts in Main Circuit
Because the voltage and current of the power supply (input, primary circuit) of the main circuit of the
inverter and those of the motor (output, secondary circuit) include harmonic components, the
readings may vary with the type of the meter. Use meters indicated in Table 7.4 when measuring with
meters for commercial frequencies.
The power factor cannot be measured by a commercially available power-factor meter that
measures the phase difference between the voltage and current. To obtain the power factor,
measure the power, voltage and current on each of the input and output sides and calculate in the
following formula.
„
Three-phase input
„
Single-phase input
% 100 ×
(A) t (V)×Curren ×Voltage 3
(W) power Electric
= factor Power
% 100 ×
(A) Current × (V) Voltage
(W) power Electric
= factor Power