Operation; Preparation For Starting Operation; Zero Point Adjustment - YOKOGAWA EJX110A Installation Manual

6.

Operation

NOTE
For F Fieldbus, PROFIBUS PA and Modbus
OUNDATION
communication types and for the transmitter operating
confirmation and zeroing by any communication
method, refer to each communication manual.
6.1 Preparation for Starting
Operation
 Confirming that Transmitter is Operating
Properly
On the integral indicator
• If the wiring system is faulty, the display stays blank.
• If the transmitter is faulty, an error code is displayed.
Self-diagnostic error
on the integral indicator
(Faulty transmitter)
 Verify and Change Transmitter
Parameter Setting and Values
The parameters related to the following items are set at
factory as specified in order.
• Calibration range
• Integral indicator display
• Output mode
• Software damping (optional)
Other parameters like following are shipped with the
default setting.
• Low-cut
• Process alarm setting
• Static pressure range
• Signal characterizer
• Write protection
To confirm or change the values, please refer to each
communication manual.
 Output Status Setting at CPU Failure and
Hardware Write Protection
Set the switches as shown in the figure below to set the
burn-out direction and write protection. The Burnout
switch is set to the H side for delivery (unless option code
/C1 or /C2 is specified in the order), and the hardware
write protection switch is set to E side except EJX910A
and EJX930A. The setting of the switches can be
confirmed via communication.
Slide switch
CPU assembly
Burnout Direction
Switch Position
Burnout Direction
Write Protection
Switch Position
Write Protection
Figure 6.1
6.2

Zero Point Adjustment

After completing preparations for operating the
F0601.ai
transmitter, adjust the zero point.
Zero point adjustment can be done by turning the
transmitter's zero-adjustment screw or by using the
communicator. This section describes the procedure
for the zero-adjustment screw. For the zero-adjustment
via communication, procedure, please refer to each
communication manual.
IMPORTANT
Do not turn off the power to the transmitter
immediately after performing a zero point adjustment.
Powering off within 30 seconds of performing this
procedure will return the zero point to its previous
setting.
6.2.1 Adjusting Zero Point for Differential
Pressure Transmitters
Before adjusting zero point, make sure that the equalizing
valve is open.
Figure 6.2
<6. Operation>
Burnout direction switch
BO H
WR E
Write protection switch
Burnout direction switch (BO)
H L
HIGH
Hardware write protection switch (WR)
H L
E D
NO
(Write enabled)
Burn-out Direction and Hardware Write
Protection Slide Switch
Zero-adjustment screw cover
External Zero Adjustment Screw
48
L
D
H L
LOW
H L
E D
YES
(Write disabled)
F0602.ai
F0603.ai
IM 01C25A01-01E