5-81
Judgment on the life of DC link bus capacitor (Bit 4)
Whether the DC link bus capacitor has reached its life is determined by measuring the length
of time for discharging after power OFF. The discharging time is determined by the
capacitance of the DC link bus capacitor and the load inside the inverter. Therefore, if the load
inside the inverter fluctuates significantly, the discharging time cannot be accurately
measured, and as a result, it may be mistakenly determined that the life has been reached. To
avoid such an error, you can disable the judgment on the life of the DC link bus capacitor.
Since load may vary significantly in the following cases, disable the judgment on the life
during operation. Either conduct the measurement with the judgment enabled under
appropriate conditions during periodical maintenance or conduct the measurement under the
operating conditions matching the actual ones.
• A remote keypad (option) is used.
• Another inverter or equipment such as a PWM converter is connected to the terminals of
the DC link bus.
For details, refer to Chapter 7.
To set data of H98, assign functions to each bit (total 5 bits) and set it in decimal format. The
table below lists functions assigned to each bit.
Bit number
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Function
Judge the life
of DC link bus
capacitor
Select life
judgment
threshold of DC
link bus capacitor
Detect
output
phase loss
Detect
input
phase loss
Lower the
carrier
frequency
automatically
Data = 0
Disable
Use the factory
default
Disable
Disable
Disable
Data = 1
Enable
Use the user
setting
Enable
Enable
Enable
Example of
decimal
expression (19)
Enable (1)
Use the factory
default (0)
Disable (0) Enable (1)
Enable (1)
Conversion table (Decimal to/from binary)
Decimal
Binary
Decimal
Binary
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
16
1
0
0
0
0
1
0
0
0
0
1
17
1
0
0
0
1
2
0
0
0
1
0
18
1
0
0
1
0
3
0
0
0
1
1
19
1
0
0
1
1
4
0
0
1
0
0
20
1
0
1
0
0
5
0
0
1
0
1
21
1
0
1
0
1
6
0
0
1
1
0
22
1
0
1
1
0
7
0
0
1
1
1
23
1
0
1
1
1
8
0
1
0
0
0
24
1
1
0
0
0
9
0
1
0
0
1
25
1
1
0
0
1
10
0
1
0
1
0
26
1
1
0
1
0
11
0
1
0
1
1
27
1
1
0
1
1
12
0
1
1
0
0
28
1
1
1
0
0
13
0
1
1
0
1
29
1
1
1
0
1
14
0
1
1
1
0
30
1
1
1
1
0
15
0
1
1
1
1
31
1
1
1
1
1
