N700 Operating Instructions and Parts Manual
15. Maintenance and inspection
153
15.4
Capacitor Life Curve
Fig. 15- 1 Capacitor Life Curve
(Note 1) Ambient air temperature means the surrounding temperature of the inverter. In case the
inverter is installed in a cabinet, ambient air temperature is the temperature of the
internal air of the cabinet.
(Note 2) DC bus capacitors are recommended to be replaced every 5 years. And if the inverter is
used in a worse condition, this recommended replacing period is reduced.
15.5
Megger test
(1) When executing a megger test on the inverter remover all wires to R, S, T, PD, N, RB, U, V
and W.
(2) Do not use a megger or buzzer on the control circuit only use a digital multi-meter.
(Megger Voltage 500V DC)
(3) Execute megger test is complete, reconnect the J61 connector has been removed.
(4) Short terminals of R, S, T, PD, P, N, RB, U, V, and W.
(5) After the megger test is complete, reconnect the J16 connector as before.
Fig. 15- 2 Megger test Method