*
1 If the output of an external power supply is within the range of
4.5 - 12.5V, you do not need a current limiting resistor Ra. If
the output exceeds 12.5V, however, please connect the current
limiting resistor Ra.
To calculate a current limiting resistance value, please use the
following equation.
Ra[
W
]=
Vcc-(1.1+Ri
X
0.005)
0.005
2.10 Isolation
¡
When you run a Hi-Pot test as receiving inspection, gradually in-
crease the voltage to start. When you shut down, decrease the
voltage gradually by using a dial. Please avoid a Hi-Pot tester
with a timer because, when the timer is turned ON or OFF, it may
generate a voltage a few times higher than the applied voltage.
2.11 Signal Output (LED/Warning/Alarm)
¡
Functions of LED indicators and Output of Warning/Alarm are
shown below. LED indicators and Output of Warning/Alarm are
signals to check the presence/absence of voltage at the output
terminal of a power supply and to detect warning/fault conditions.
The timing of signals might be vary depending on input and load
conditions. Please make sure enough evaluation.
Table 2.3 Description of LED indicator
LED indicator
Condition
Output voltage
OFF
Input power not present
OFF
Green - ON
Normal condition
ON
Green - Blinking
DC OFF by RC signal
OFF
Amber - Blinking
Warning condition
(refer to Table.2.4)
ON
Amber - ON
Fault condition
(refer to Table.2.5)
OFF
Table 2.4 Description of the Warnings (WRN signal)
Warning
Output of Warning
WRN
The WRN signals are ”Low”
when the power supply oper-
ates normally.
The signals turn ”High” when
AC input voltage is wrong
(AC<170V, AC>264V) or DC
output voltage is wrong(DC
output voltage is out of volt-
age adjustment range.) or
fan alarm/thermal warning is
detected.
Open collector method
Good : L level
(0 to 0.5V at 3mA)
Bad : H level or Open
(35Vmax)
Table 2.5 Description of the alarms (PG signal)
Alarm
Output of Alarm
PG
The PG signals are ”Low”
when the power supply oper-
ates normally.
The signals turn ”High” when
the fan stops or the power
supply stops as a result of
output voltage decrease/stop,
activation of thermal protec-
tion, overvoltage protection,
Low-Voltage protection func-
tions or wrong input voltage
is applied.
Open collector method
Good : L level
(0 to 0.5V at 3mA)
Bad : H level or Open
(35Vmax)
100k
W
0.1
m
F
WRN
WRNG
Fig.2.4 Internal circuit of WRN
100k
W
0.1
m
F
PG
PGG
Fig.2.5 Internal circuit of PG
¡
Please note the followings when you use the warnings (WRN sig-
nal) and the alarms (PG signal).
1
The time it takes until the WRN signals and the PG signals turn
”High” vary depending on conditions.
2
If the output voltage is turned off through a remote ON/OFF cir-
cuit, the WRN signals and the PG signals keep ”Low”.
¡
The WRN signal (Warning) circuit and the PG signal (Alarm) cir-
cuit are isolated from input, output, FG, RC and AUX.
AC-DC Power Supplies Enclosed type
Instruction Manual
FETA-8
FETA
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