2.9 Discharging resistor: R1
■
If you need to meet the safety standards, connect a discharging resistor R1 at input
interphase.
■
Please select a resistor so that the input interphase voltage decreases in 42.4V or less
at 1 second after turn off the input.
■
Fig.2.6 shows the relationship between a necessary resistance of R1 and total capacitance
of input interphase capacitors.
And the data of Fig.2.6 is the values that assumed the worst condition.
■
Please keep margin for rated voltage and power of R1.
Fig.2.6
TUNS500F
Relationship
between
a necessary
resistance of R1
and total
capacitance of
input interphase
capacitors
A-7
0
50
100
150
200
250
300
350
400
450
0
1
2
3
4
5
6
7
8
9
10
Total capacitance of input interphase capacitors [uF]
R
1
[k
Ω
]
Applications Manual
TUNS300/500/700
