YOKOGAWA UT130, Техническая информация

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8-7
TI 05C01E02-01E 1st Edition : Oct. 31, 2001-00
8.3 Wiring
CAUTION
1) Before you start wiring, turn off the power source and use a tester to check that the controller
and cables are not receiving any power in order to prevent electric shock.
2) Wiring should be carried out by personnel with appropriate electrical knowledge and experience.
NOTE
1) Use a single-phase power source. If the source has a lot of noise, use an isolation transformer
for the primary side and a line filter (we recommend TDK’s ZAC2205-00U product) for the sec-
ondary side. When this noise-prevention measure is taken, keep the primary and secondary
power cables well apart. Since the controller has no fuse, be sure to install a circuit breaker
switch (of 5A and 100V AC or 220V AC, and that conforms to IEC standards) and clearly indicate
that the device is used to de-energize the controller.
2) For thermocouple input, use shielded compensating lead wires. For RTD input, use shielded
wires which have low resistance and no resistance difference between the 3 wires. See the table
given later for the specifications of the cables and terminals and the recommended products.
3) The control output relay cannot be replaced even though it has a limited service life (100,000
relay contacts for the resistance load). Thus, an auxiliary relay should be used so that the load
can be turned on and off.
4) When using an inductive load (L) such as an auxiliary relay and solenoid valve, be sure to insert
a CR filter (for AC) or diode (for DC) in parallel as a spark-rejecting surge suppressor to prevent
malfunctions or damage to the relay.
5) When there is the possibility of being struck by external lightening surge, use the arrester to
protect the instrument.
IMPORTANT
Always fix a terminal cover bracket to the UT130 controller before wiring if an optional anti-electric-
shock terminal cover (part number: L4000FB) is used.