YOKOGAWA EJX Series, User Manual

Page: 32 / 52

<5. Wiring>
30
IM 01C25A01-01E
5.2.5 External Temperature Connection
(for EJX910A and EJX930A)
Connect the RTD cable assembly to the Juck Terminal.
F0505.ai
SUPPL
Y
PULSE
CHECK
ALARM
Figure 5.5 External Temperature Connection
5.3 Wiring
5.3.1 Loop Configuration
Since the DPharp uses a two-wire transmission system,
signal wiring is also used as power wiring.
DC power is required for the transmitter loop. The
transmitter and distributor are connected as shown below.
For details of the power supply voltage and load
resistance, see Section 5.6.
(1) General-use Type and Flameproof Type
• Analog Output
Hazardous Location Nonhazardous Location
Transmitter terminal box
Distributor
(Power supply unit)
Receiver
instrument
F0506.ai
SUPPL
Y
PULSE
CHECK
ALARM
Figure 5.6 Connection between Transmitter and
Distributor
• Pulse output and Alarm, Status Output or
Simultaneous Analog-Pulse Output
(for EJX910A and EJX930A)
SUPPL
Y
PULSE
CHECK
ALARM
Hazardous Location Nonhazardous Location
Transmitter terminal box
Distributor
(Power supply unit)
Receiver
instrument
Receiver
instrument
F0507.ai
Figure 5.7 Connection between Transmitter and
Distributor
(2) Intrinsically Safe Type
With the intrinsically safe type, a safety barrier must be
included in the loop.
Hazardous Location Nonhazardous Location
Transmitter terminal box
Distributor
(Power supply unit)
Receiver
instrument
Safety barrier
F0508.ai
SUPPL
Y
PULSE
CHECK
ALARM
Figure 5.8 Connection between Transmitter and
Distributor
(3) Intrinsically Safe Type (for EJX910A and
EJX930A)
• Analog Output
SUPPL
Y
PULSE
CHECK
ALARM
Hazardous Location Nonhazardous Location
Transmitter terminal box Receiver instrument
(and power supply)
Safety barreir
(Isolation type)
F0509.ai
Anaolg input
Power
supply
• Simultaneous Analog-Pulse Output
SUPPL
Y
PULSE
CHECK
ALARM
Hazardous Location Nonhazardous Location
Transmitter terminal box
Safety barrier
(Isolated type)
I/O module
F0510.ai
Safety barrier
(Isolated type)
Power
supply
Power
supply
Analog input
Pulse input
Figure 5.9 Connection between Transmitter,
barrier and receiver