Hach EC1000, Instruction Manual

Page: 66 / 128

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The recommended size of the power supply leads is 18AWG, but can be in the range of
12AWG to 18AWG. The wires are routed through the center conduit hole and are hooked
up to the power connector (see Figure 17 on page 63). The power leads are twisted
together to fit in the compartment formed by the wire shield and the back of the case.
5.6.2.1 Line Voltage Selection for Meter
Note: Misapplication of AC
line power to this
instrument can cause
damage to the instrument.
Prior to connection, verify
that the Volt Select Switch
is set for the proper AC
line requirement.
This instrument is factory set and properly fused for 115 Vac line requirements. To convert
the instrument for 230 Vac line requirements, proceed as follows:
1. Rotate the indicator slot on the Volt Select Switch to the 230 V position (see Figure 18
on page 64).
2. Remove the 0.2A fuses, and replace them with appropriate type 0.1A fuses (refer to
Section 8.3 Fuse Replacement).
5.6.3 Alarms
The alarm relays have unpowered contacts, and the power to operate the load is supplied
by the user. Figure 19 shows a typical wiring configuration. The wires must be sized
according to the load used. For the maximum 5A load, the wires must be a minimum
of 16 AWG.
The wires are routed through the left conduit hole (see Figure 17 on page 63), and are
hooked up to J5 on the front panel (see Figure 18 on page 64). Maximum voltage is
30Vrms (42.4V pk).
Figure 19 Typical Wiring Configuration
5.6.4 Recorder and Controller
The recorder and controller connections are isolated 4-20 mA outputs and should be
connected with twisted pair shielded cable. The shield wire should be connected at the
instrument end only.