Precision Digital Corporation PD6900 Series, Instruction Manual

Page: 24 / 82

PD6928 Ex-Proof & I.S. Loop-Powered Flow Rate/Totalizer Instruction Manual
24
Wiring Diagrams
Intrinsically Safe Wiring
1. PD6928 installation must be performed in
accordance with control drawings included in the
LIM6908-2 , in order to meet agency approval
ratings.
•
For ATEX certification, barrier and transmitter
must be ATEX Certified with Entity Parameters
and must be connected per manufacturer’s
instructions.
•
Service requiring replacement of internal
components must be performed at the factory.
•
Entire meter assembly (electronic assembly) may
be replaced in the field with a unit supplied from
the factory labeled “Field Modification”.
I/O Parameter Table
4-20 mA Loop Input Switch Port
Ui = 30 V Ui = 30 V
Ii = 175 mA Ii = 175 mA
Pi = 1 W Pi = 1 W
Ci = 0 Ci = 0
LI = 0 LI = 0
Open Collector Outputs Backlight Terminal
Ui = 30 V Ui = 30 V
Ii = 175 mA Ii = 175 mA
Pi = 1 W Pi = 1 W
Ci = 0 Ci = 0
LI = 0 LI = 0
Power Supply Input mA Output
Ui = 30 V Ui = 30 V
Ii = 175 mA Ii = 175 mA
Pi = 1 W Pi = 1 W
Ci = 0 Ci = 0
LI = 0 LI = 0
Relay Outputs
Ui = 30 V
Ii = 1000 mA
Pi = 1 W
Ci = 0.013 uF
LI = 0
Uo = 11.55 V
Io = 1 mA
Po = 0.012 W
Explosion-Proof Wiring
Current Loop (4-20 mA) Connections
Signal connections are made to a three-terminal
connector. See
Connectors Labeling on page 22 . The
following figures show a 4-20 mA current loop
connected to the meter.
Figure 8 shows the
connection without the backlight and Figure 9 shows
the connection with the backlight (the backlight can be
disabled/enabled in the
SYSTEM
menu, if connected).
The meter and the backlight are powered by the
4-20 mA current loop.
There are no switches or jumpers to set up for the
input. Setup and programming are performed through
the CapTouch buttons or PC-based software.
Figure 8. 4-20 mA Input Connection without Backlight
Figure 9. 4-20 mA Input Connection with Backlight
The current input is protected against current
overload up to 1 amp. The display may or may not
show a fault condition depending on the nature of the
overload.
- - +
BL mA
4-20 mA
Transmitter
+ -
Power
Supply
+
-
- - +
BL mA
4-20 mA
Transmitter
+ -
Power
Supply
+
-