RUN
FDT1
Output
Terminal [DO1]
7-8-10
Capacitor Life Warning Signal (WAC)
Use this signal to determine the life expectancy of the internal capacitor based on the inverter’s inter-
nal temperature, conduction time, and the capacity of the capacitor.
By turning bit 4 of Protection/Maintenance Function Mode Selection (H98) ON, the service life of the
capacitor is judged to have reached its end when any one of the following conditions is satisfied, and
WAC (Capacitor life warning signal) is turned ON.
•
The capacity of the capacitor becomes 85% or below the factory default value.
• The conduction time exceeds 61,000 hours (7 years) in all models of the HND mode “A2022/037,
A4022/040, AB002-022” and ND mode.
• The conduction time exceeds 87,000 hours (10 years) in models other than the above.
The capacity of the capacitor can be monitored by "Main circuit capacitor's capacity monitor (Monitor
mode: 5_05)", and the conduction time by “Service life of DC link bus capacitor (Elapsed time) (Moni-
tor mode: 5_26).”
This function is set based on A-2 Smoothing Capacitor Life Curve on page A-6.
The time until the service life of the main circuit capacitor is reached (in 10 hours) is displayed in Serv-
ice Life of Main Circuit Capacitor Remaining Time (H77).
Parameter No. Function name Data
Default da-
ta
Unit
H98
Protection/Mainte-
nance Function Mode
Selection
bit 4: Judge main circuit capacitor life - -
E20, E21, E27
Output Terminal [DO1]
Function Selection,
Output Terminal [DO2]
Function Selection,
Output Terminal
[ROA, ROB] Function
Selection
240: WAC (Capacitor life warning signal) - -
Method for Comparing the Main Circuit Capacitor's Capacity and
the Default Value during Shipment from Factory
When bit 3 = 0 at Protection/Maintenance Function Mode Selection (H98), follow the measurement
procedure below to measure the capacitance of the main circuit capacitor when the power supply is
cut off, and compare the value with the default value at the time of shipment from the factory. The
7 Other Functions
7-96
M1 Series Standard Type User's Manual (I669)
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