Yokogawa PK200 - Manual (Page 26)

IM 21B03D01-01E 6-4
6. MAINTENANCE
(3) Where a built-in arrester is provided (suffix
code: /A), the voltage for the insulation
resistance test must be 100V DC or lower,
and the voltage for the withstand voltage test
must be 100V AC or lower. Failure to heed
these guidelines may cause faulty operation.
Follow the steps below to perform the test, the wiring
of the communication line must be removed before
initiating testing.
Insulation resistance test procedure
1. Lay transition wiring between the + terminal and the
- terminal.
2. Connect the insulation resistance meter (with the
power turned OFF) between the transition wiring of
Step 1 above and ground terminal. The polarity of
the input terminals must be positive and that of the
ground must be negative.
3. Turn the power of the insulation resistance meter
ON and measure the insulation resistance. The
duration of the applied voltage must be the period
during which 100 M
Ω or more is confirmed (or 20
M
Ω if the unit is equipped with a built-in arrester).
4. Upon completion of the test, remove the insulation
resistance meter, connect a 100 k
Ω resistor between
the transition wiring, and allow the electricity to
discharge. Do not touch the terminal with your bare
hands while the electricity is discharging for more
than one second.
Withstand voltage test procedure
Testing between the input terminals and the grounding
terminal
1. Lay the transition wiring between the + terminal and
the - terminal, and connect the withstand voltage
tester (with the power turned OFF) between the
transition wiring and the grounding terminal.
Connect the grounding side of the withstand voltage
tester to the grounding terminal.
2. After setting the current limit value of the withstand
voltage tester to 10 mA, turn the power ON, and
gradually increase the impressed voltage from 0 V
to the specified value.
3. The voltage at the specified value must remain for a
duration of one minute.
4. Upon completion of the test, carefully reduce the
voltage so that no voltage surge occurs.