Kikusui PAD-L III Series, Руководство по эксплуатации

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4-30 Applied Operation PAD-L
4.7 Shutting off the POWER switch
If terminals 7 and 8 of the control terminal board are short-circuited, the POWER
switch is shut off instantly.
WARNING
• Avoid touching terminals 7 and 8 of the control terminal board
immediately after shutting off power. Terminals 7 and 8 have the
same potential as the + terminal of the unit rectifier smoothing
capacitor.
Immediately after power is shut off, a large-capacity capacitor in
the rectifier circuit retains energy levels hazardous to the human
body. It takes more than 30 seconds for this energy to dissipate to
safe levels.
Connecting procedure
1. Turn off the POWER switch.
2. Connect a contact S (switch) across the control terminal 7 and 8 as
shown in Fig. 4-18.
WARNING
• Isolate the external contact (S) and the cable connected to it with
at least the isolation voltage of the unit. Float a signal from the
external contact. Terminals 7 and 8 of the control terminal board
have the same potential as the + terminal of the unit's rectifier
smoothing capacitor, and the voltage applied to them will exceed
the output voltage.
• Since terminals 7 and 8 of the control terminal board have the
same potential as the + terminal of the unit's rectifier smoothing
capacitor, short-circuiting them with the + (pos.) output terminal
also short-circuits the control transistor, resulting in an
uncontrolled output voltage across the load.
Moreover, when the - (neg.) output terminal is connected to the
GND (chassis ground) terminal, contact between terminal 7 or 8
and the chassis short-circuits the secondary output of the
transformer. This may result in electric shock or output short-
circuiting hazards.
CAUTION
• To assure a good connection, use crimped terminals.
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NOTE
• Use external contact points of contact rated 30 VDC min. and 250 mA min.
• For long-distance wiring, use a small relay and extend the coil side of that
relay.
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