Liquid Controls LCR-II Installation E3655-E3656 - Manual (Page 25)

25
DifferentiAl Pressure (∆P) trAnsDuCer
Differential Pressure (∆P)
Transducer Installation
When ordered as part of a meter system with a LCR-II,
Liquid Control’s ∆P transducer is wired to the LCR-II
at the factory. The ∆P transducer can also be ordered
separately and installed onto a meter system already in
service. Refer to the ∆P transducer manual for complete
installation instructions. Instructions for wiring the ∆P
transducer to the LCR-II are provided on this page.
The ∆P Transducer requires an additional board (PN
81944) that mounts directly to the LCR-II CPU board.
Typically, a ∆P transducer operates in conjuction with a
shutdown device, such as a valve or a dead-man. The
shutdown control must be wired to the LCR-II and should
draw no more than 1 A.
to wire ∆P transducer to the lCr-ii:
1. Unplug the j1, j2, and j3 terminal blocks from the LCR-II
CPU board. Leave the wires in the terminals.
2. Remove the screw at the top left corner of the LCR-II
CPU board.
3. Plug the 81944 board into the J1 connectors on the LCR-
II CPU board.
4. Fasten the top left side of both boards to the housing with
the screw provided.
5. Plug terminal block j1 into the 81944 board. Plug j2 and
j3 back into the LCR-II CPU board
6. Plug terminal J16 into the 81944 board.
7. Route the ∆P transducer cable through a cable gland in
a port on the back of the LCR-II. Secure the cable gland.
LC recommends running the cable through weatherproof
conduit.
8. Connect the four ∆P transducer wires to terminals j3 on
the LCR-II CPU board and J16 on the 81944 board.
• Black to j3 terminal 46
• White to j3 terminal 51
• Yellow to j16 terminal 57
• Blue to j16 terminal 58
• Red to j16 terminal 59
9. Run the red jumper wire (provided with the ∆P transducer
kit) from the j8 terminal 32 to j16 terminal 59 (+5 V).
10. Route a two wire cable from the shutdown control device
through a cable gland in a port on the back of the LCR-II.
Secure the cable gland. LC recommends running the
cable through weatherproof conduit.
11. Connect the two wires from the shutdown control device
to terminal block j13, terminals 14 and 15.
11 12 13
PRINTER SERIAL 485 TERMINAL
POWER
COUNTER
MH1 CTS RXD TXD RTS GND GND 485+A 485-B CTS RXD TXD RTS +VP
EARTH
GND GND IN 1 IN 2 IN 3 IN 4 +5V OUT +VP
GND +12-24V
MH4
J20
J6
J3 J2 J1
J7 J7
C2
24 25
∆P Transducer
+5V(Out)/Jumper (59 to 32)
A/Blue (58)
+5V/Red (59)
B/Yellow (57)
GND/White (51)
+VP/Black (46)
B
Dead-Man
Shutdown
Auxiliary
Device
84040 Board
+Vo
Out7
The shutdown device should
draw no more than 1A.
When removing the J1
or J16 terminal from
the 81944 board, hold
down the right end of
the main CPU board to
prevent flexing.
Be Careful with the
CPU Board