ABB Aztec 600

Aztec 600 ISE ammonia and fluoride
Single-stream ion-selective analyzers 3Installation
16 OI/AXM630–EN Rev. I
3.5.3 Ethernet Connection
The Ethernet gland is different from the other connections to
accommodate an RJ45 plug:
1. Referring to steps 1 and 2 in Section 3.5.2, page 15, open
the electronics section door and remove the transparent
cover plate.
2. Referring to Fig. 3.7:
a. Slide retaining clip A off blanking plug B and
remove the blanking plug.
b. Fit cable gland C and secure using nut D.
c. Remove gland cover
E and route cable F through
it.
d. Fit the rubber split-bush G and split-washer H over
the cable.
e. Route the cable through cable gland C and into the
enclosure case.
f. Plug the RJ45 connector J into the Ethernet RJ45
connector socket on the application board (see
Fig. 3.5, page 14 for location details) and tighten gland
nut
E.
3. Referring to step 12 in Section 3.5.2, page 15, refit the
transparent cover plate and close and secure the
electronics section door.
3.5.4 Alarm Relay Contact Protection and Interference
Suppression
If the relays are used to switch loads on or off, the relay contacts
can become eroded due to arcing. Arcing also produces RFI
that can cause analyzer malfunctions and incorrect readings. To
minimize the effects of RFI, arc suppression components are
required; these are resistor / capacitor networks for AC
applications or diodes for DC applications. These components
can be connected across the load.
Maximum relay ratings are:
 250 V, 5 A AC, 1250 VA (non-inductive)
 30 V, 5 A DC 150 W
For AC applications the value of the resistor / capacitor network
depends on the load current and inductance that is switched.
Initially, fit a 100R / 0.022 µF RC suppressor unit. If the analyzer
malfunctions the value of the RC network is too low for
suppression and an alternative value must be used.
For DC applications fit a diode – see Fig. 3.8. For general
applications use an alternative IN5406 type (600 V peak inverse
voltage at 3 A).
Fig. 3.7 Ethernet Connections
A
B
C
D
E
F
G
H
J
Fig. 3.8 Relay Contact Protection
Note. For reliable switching the minimum voltage must be
>12 V and the minimum current >100 mA.
NC C NO
NC C NO
R
C
LN
+–
Relay Contacts
External AC
Supply
A – AC Applications
B – DC Applications
External DC
Supply
Relay Contacts
Load
Load
Diode