Fuji Electric Co., Ltd.
3-18
MT6M12343 Rev.1.0
Dec.-2016
Chapter 3
Detail of Signal Input/Output Terminals
6. Fault Status Output Terminal VFO
Fig.3-21 Recommended MPU I/O Interface Circuit of VFO terminal
Fig.3-22 Voltage-current Characteristics of VFO terminal at the fault state condition
As shown in Fig.3-21, it is possible to connect the fault status output VFO terminal directly to the MPU.
VFO terminal is open drain configured, thus this terminal should be pulled up by a resistor of
approximate 10k
to the positive side of the 5V or 3.3V external logic power supply, which is the same
as the input signals. It is also recommended that the by-pass capacitor C1 should be connected at the
MPU, and the inrush current limitation resistance R1, which is more than 5k
,
should be connected
between the MPU and the VFO terminal. These signal lines should be wired as short as possible.
Fault status output VFO function is activated by the UV of V
CCL
, OC and OH.
(OH protection function
is applied to “6MBP**XSF060-50”.)
Fig.3-21 shows that the diodes in the IPM are electrically connected to the V
CCL
, VFO and COM
terminals. They should not be used for voltage clamp purpose to prevent major problems and destroy
the IPM.
Fig.3-22 shows the Voltage-current characteristics of VFO terminal at fault state condition. The
I
FO
is
the sink current of the VFO terminal as shown in Fig.3-21.
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.0
0.2
0.4
0.6
0.8
1.0
IFO[mA]
V
F
O[
V
]
10k
Ω resistance to 5V
pull-up
MPU
COM
Vcc
< LVIC >
GND
V
CCL
VFO
FO
internal supply
Alarm
timer
10 k Ω
+ 5 V
IFO
OC
V
CCL
_
UV
( OH
)
R 1
C 1
