Yokogawa digitalYEWFLO (DY) - Manual (Page 55)

MAINTENANCE
IM 1F2B4-01-YIA
Page 59
4.1.1 Communicating with the YEWFLO remotely
The BT100/BT200 may be connected directly to terminals on the amplifier to communicate. You must
direct connect to communicate when the output jumpers are set for pulse output.
With analog output
configuration, you may communicate either on the 4-20 mA loop wires or via a direct connection. The
following conditions must exist in either case for communication to operate properly.
Analog output mode
1.
250
Ω
to 600
Ω
of resistance must be in the loop, even for direct amplifier connection.
2. The output jumpers on the amplifier must be set to the analog position.
3. The vortex meter must be powered by 18.5 to 42 VDC. For proper communication at the meter
terminals, the ripple should be < 100 mVAC. Refer to figure 1.3.2 for power supply requirements.
4. Attach one end of the BT100/200 communication cable to the top of the communicator.
5. For Analog mode, there are two ways to communicate as follows:
A. Local Communication: Attach the other end of the communication cable to the HHT ANALOG
terminal and the HHT COM terminal on the amplifier itself. These connection points are labeled
per above and color coded with a yellow bead. Polarity does not matter.
B. Remote Communication: Connect the handheld terminal to the 4-20 mA signal wires, such that
at least 250
Ω
of the loop load is between the leads. Polarity does not matter.
Pulse output mode
1.
The output jumpers on the amplifier must be set to pulse position.
2. The vortex meter must be powered by 14 to 30 VDC.
3. Attach one end of the BT100/200 communication cable to the top of the communicator.
4. On a pulse output vortex meter there is NO requirement for 250
Ω
of resistance.
5. For Pulse mode, only local communication is supported.
A. Attach the other end of the communication cable to the HHT PULSE terminal and the HHT
COM terminal on the amplifier itself. These connection points are labeled per above and color
coded with a yellow bead. Polarity does not matter.
Communication Start-up
BT200 handheld terminal BT100 handheld terminal
1. Power up by pressing the ON/OFF key.. Power up by pressing the POWER key.
The WELCOME message indicates the handheld terminal is working properly.
2. Press ENTER and a screen of information such as
YEWFLO*E showing what instrument you are connected
to, TAG NO., and SELF CHECK status, is displayed. Press MENU (or any key) and YEWFLO*E is displayed
showing your instrument connection.
3. Press m e
nu (or any key) again and TAG NO. is
displayed.
4. Press m e
nu (or any key) again to display SELF CHECK
status.
At this point you are ready to begin configuring or otherwise interrogating the YEWFLO parameters.
5. Pressing ENTER again (F4 soft key OK) will
display a list of menus to choose from. Pressing m e
nu (or any key) again will take you to
the A:DISPLAY menu - the top of all menus.
This process completes start-up of communication. Once you are successfully communicating, please refer
to the appropriate “How To” section to help you make the configuration change desired. If you receive a
Comm. Error recheck the connections as described above, and insure that the batteries in the handheld
terminal are fully charged. Refer to figure 4.5.1 for a connection diagram.