Installation
2–10 H
2
S in Natural Gas
14. Reinstall the modular plug-in terminals to their corresponding
sockets on the EPCU base module, by folding the wires over gently
and pushing the fold of wire down and away from the base module,
into the bottom wiring cavity located between the conduit openings.
15. Double check to ensure that all excess wiring remains in position to
provide necessary clearance for the installation of the EPCU module
assembly.
16. Attempt insertion of the EPCU module assembly to ensure adequate
clearance between wiring and EPCU module assembly.
17. Upon successful insertion of the EPCU module assembly, complete
reassembly of the EPCU module by reversing steps 7 through 1
above.
Connecting the Input and Output Signals
The 4-20 mA current loop, serial output and optional validation request input
are supplied from a mating terminal block inside the analyzer control box. In
addition, a general alarm, high concentration alarm, and validation fail alarm
(if applicable) are connected to relays inside the analyzer control box.
Connections can be made with customer-supplied cable for the current loop,
optional validation request and alarms, and factory-supplied cable for the serial
connection. Consult the wiring diagram in Figure B–3 on page B-4.
To connect the signal cables:
1. Disconnect power from the analyzer and open the control box cover.
Take care not to disturb the electrical assembly inside.
2. Run conduit from the signal receiving station to one of the conduit
hubs in the lower right hand corner of the control box.
The EPCU module assembly and housing cover provide minimal
clearance for the plug in terminals and associated wiring. If EPCU
module assembly is difficult to insert, or the housing cover makes
contact with the wiring, or the power module interface connection
will not easily engage, check wiring for insufficient clearance and
ensure wire is trimmed, routed and tapered as instructed above.
Be sure power to the analyzer is turned off before opening the gas
sensor enclosure and making any connections.
The 4-20 mA current loop outputs are factory set to source
current.
To Next Page
Loading...
