Yokogawa EJX930A - Manual (Page 39)

<7. Wiring>
7-2
IM 01C25R01-01E
(2) Pulse output and Alarm, Status Output
This instruments uses three wires between the
converter and the power supply.
A DC power and load resistance are required, and
pulse output is connected to a totalizer or an electric
counter.
Low level of the pulse output is 0 to 2V. No
communication is possible over a transmission line.
(3) Simultaneous Analog-Pulse Output
When using the simultaneous analog-pulse
output mode, the communicable distance of the
transmission line is restricted on the wiring method.
Table 7.2 shows the examples of connection for this
output mode.
IMPORTANT
For pulse output and the simultaneous analog-
pulse output, use the load resistance. Refer to
Table 7.2.
7.4 Connection
7.4.1 Power Supply Wiring Connection
Table 7.2 shows the wiring example according to
the output types.
7.4.2 External Indicaror Connection
Connect wiring for external indicators to the CHECK
+ and – terminals.
(Note) Use a external indicator whose internal resistance is 10Ω
or less.
Transmitter terminal box
External indicator
F0702.ai
Power supply
–
+
SUPPL Y
PULSE
CHECK ALARM
Figure 7.2 External Indicator Connection
7.4.3 Communicator Connection
Connect the HART Hand Held Terminal (HHT) to
the SUPPLY + and – terminals.
SUPPL Y
PULSE
CHECK ALARM
Transmitter terminal box
HART HHT
F0703.ai
Power supply
–
+
Ignore the polarity
since the HART HHT
is AC-coupled to the
terminal box.
Figure 7.3 HART HHT Connection
7.4.4 Check Meter Connection
Connect the check meter to the CHECK + and
– terminals. (Use hooks.)
• A 4 to 20 mA DC output signal from the CHECK
+ and – terminals.
(Note) Use a check meter whose internal resistance is 10 or less.
SUPPL Y
PULSE
CHECK ALARM
Transmitter terminal box
F0704.ai
Power supply
–
+
Check meter
Figure 7.4 Check Meter Connection
7.4.5 External Temperature Connection
Connect the RTD cable assembly to the Juck
Terminal.
F0705.ai
SUPPL Y
PULSE
CHECK ALARM
Figure 7.5 External temperature Connection