Network Termination; Network Termination At The Aquatrend With Som Or At The Som - Hach AquaTrend 51200 Instrument Manual

Section 5
Make the connections at the AquaTrend Interface without SOM as follows:

5.4 Network Termination

Note: To avoid damaging the
instrument, remove power to the
instrument before removing the
front cover.

5.4.1 Network Termination at the AquaTrend with SOM or at the SOM

Page 66
Network Termination
1. Make sure no power is being supplied to the power supply.
2. Use a flat-blade screwdriver to loosen the screws of the AquaTrend
Interface face.
3. Lift the face off the AquaTrend Interface and set it aside. Or, store it by
screwing the right side of the face to the left side of the back enclosure.
4. Use a punch and hammer to remove one knock-out on the inside rim of
the bottom housing. Position the punch in the center of the knockout for
best results.
Note: To assure the AquaTrend Interface continues to meet NEMA 4X, I.P.66
enclosure ratings, use only the supplied NEMA-style enclosure strain relief fittings.
5. Refer to the first and second column of
wires to the six-position terminal block (TB1) as shown in
a small flat-blade screw driver to depress each nylon lever, then insert the
appropriate wire into the terminal block.
Note: If any color wire is not present in the terminal block, skip that connection.
Note: Although conduit is generally not required for the low voltage network wiring,
conduit, if used, must be bonded together by the customer. This product does not
provide automatic conduit bonding.
Make other wiring connections at this time if necessary, then attach the
AquaTrend Interface face using the four screws.
The network signals require a terminator for proper operation. As shipped
from the factory, the terminator is disabled on all devices.
IMPORTANT NOTE:Failure to properly terminate the network may cause total
network failure. Only one device must have the network terminator
enabled.
Follow the steps below to enable the terminator.
1. Make sure no AC power is connected to the AquaTrend with SOM.
2. Verify if the system Master AquaTrend Interface is equipped with an SOM
by checking the front label and the catalog number on the Serial Number
label. It should show: Catalog Number 51350-60.
3. Remove the front face of the AquaTrend with SOM and locate J4 (a white,
three-pin connector) on the circuit board in the back enclosure of the
device (see Figure 23). A jumper connected only to pin 2 should be
present as shown in Figure
4. To enable the terminator, lift the jumper off of pin 2 and move the jumper
so that it connects pins 2 and 3 as shown in
Table 11 and connect the cable
24.
Figure 24.
51350-18 Hardware Installation.fm
Figure 22. Use