Yokogawa digitalYEWFLO (DY) - Manual (Page 46)

IM 1F2B4-01-YIA
Page 50
INSTALLATION
2) Connect a plus (+) insulation tester leadwire to these terminals and the minus (–) leadwire to
ground.
3) Turn the insulation tester power ON and measure the resistance between the two leads. Do
not apply the voltage for more than two minutes.
4) After completing the test, disconnect the insulation tester. The short-circuiting wire between
the + and – terminals should be connected to the ground terminal through a 100k
Ω
resistor
allowing discharge of any internally charged static voltage. Do not make physical contact
with these terminals until the voltage is completely discharged.
•Dielectric Strength Test
1)
Short-circuit the + and – (4-20 mA output type) or +, P and – (pulse output type) terminals in
the terminal box.
2) Connect a dielectric strength tester between the + and – terminals and the ground terminal.
(Connect the dielectric strength tester positive (+) leadwire to the short-circuited terminals
and negative (–) leadwire to the transmitter ground terminal.)
3) Gradually increase the test voltage from 0 to the specified voltage.
4) When the test voltage is obtained, maintain it for one minute.
5) After completing this test, slowly decrease the voltage to avoid any voltage surges.
3.5.3 Instruction document for FM explosionproof instruments
Wiring
• All wiring shall comply with the national electrical code ANSI/NFPA70 and local electrical codes.
• In hazardous locations, wiring shall be placed in a conduit.
Operation
• WARNING: Do not open the cover while the circuit is alive.
• Avoid generating mechanical sparks when near the instrument and peripheral devices in hazardous
locations.
Maintenance and Repair
• Instrument modification or replacement parts provided by anyone other than an authorized
representative of Yokogawa Industrial Automation is prohibited and will void the Factory
explosionproof certification.
Figure 3.5.1: Integral Type