Hach APA 6000, Installation Manual

Page: 17 / 62

The relay terminals accept 22–12 AWG wire (as determined by load
application). Wire gauge less than 18 AWG is not recommended. Use
wire with an insulation rating of 300 VAC or higher.
When switching large inductive loads (e.g., motors and pumps) or
currents higher than 5 A, use an auxiliary relay to extend the analyzer
relay life.
Use the relays at either all high voltage (greater than 30 V-RMS and
42.2 V-PEAK or 60 VDC) or all low voltage (less than 30 V-RMS and
42.2 V-PEAK, or less than 60 VDC). Do not configure a combination of
both high and low voltage.
Table 5 Relay wiring information
NC COM NO
Normally closed Common Normally open
Connect the recorder outputs (optional)
D A N G E R
Electrocution hazard. Always remove power to the instrument before
making electrical connections.
The analyzer has two recorder outputs (Recorder A and Recorder B).
The recorder outputs are isolated, self-powered, 4-20 mA current source
outputs. The current value at the recorder output represents the analyzer
measurement. Refer to the operations manual to configure the recorder
outputs.
Note: More recorder outputs (maximum of twelve) can be added. A maximum of
six 2-channel signal output modules or one 8-channel signal output module can be
connected to the analyzer.
To connect a recorder output, refer to Table 6 and Figure 13 on page 14.
The recommended output impedance is 3.6 to 500 ohms.
Table 6 Recorder output wiring
Recorder wires Circuit board markings
Re +
Recorder – –
Shield GND
Connect a network device (optional)
Use the Network connection to connect an external Aquatrend network
device to the analyzer or to connect two or more analyzers to make an
Aquatrend network. The external Aquatrend network devices that can be
connected to the analyzer include:
• Signal output module —supplies additional recorder outputs and
alarm relays.
• Serial I/O module —lets the user send RS232 data to a printer or
send/receive RS232 data to/from a computer.
• MOD I/O module — lets the user send/receive Modbus data to/from a
PLC or SCADA.
Connect the cable termination kit supplied with the optional external
Aquatrend network device to the analyzer. Refer to
Table 7 and
Figure 13 on page 14.
When the network connection wiring is done, configure the network
connection to configure the device or analyzer to the network. Refer to
the operations manual.
When the network connection is used to connect another APA analyzer,
use jumper JP11 to set one analyzer as the master and the other
analyzer(s) as a remote. Refer to
Figure 13 on page 14. The master has
network configuration capability. The remote(s) is used as a display
device.
English 17