Hach 54400-18, Instrument Manual

Page: 26 / 74

Page 24
Electrical Connections
54400_install.fm
Section 1
1.8.3 Voltage Selection for Alternate Voltage Operation
Note: The voltage selector switch
must be set properly for the line
voltage to be used. An improper
setting can result in serious damage
to the instrument when power is
applied. See
Figure 11 .
The instrument is switched for 115-volt operation when it leaves the factory.
To convert the instrument for 230-volt operation, slide the AC line conversion
switch (shown in
Figure 11 ) to the 230V position. The fuses used in this
product are 5 mm x 20 mm. The fuses used are approved for both North
American and European use; they do not need to be changed when voltage is
converted.
Figure 11 Voltage Selector Switch and Fuse Replacement
1.8.4 Alarm Connections
Note: Current to the relay
contacts must be limited to 5 amps
resistive. A method to remove
power from the relays locally must
be available in case of an
emergency or for servicing the
product. Power removal can be
accomplished with an external
switch and a 5-amp fuse or with a
switched 5-amp circuit breaker.
The analyzer contains two alarm relays designed for use with either high
voltage (greater than 30V-RMS and 42.2V-PEAK or 60 V dc) or low voltage
(less than 30V-RMS and 42.2V-PEAK, or less than 60 V dc), but not a
combination of both high and low voltage. Refer to
Figure 13 and the
instructions that follow for connection information.
The Normally Open and Common relay contacts will be connected when an
alarm condition is active.
The relay connector accepts 18-12 AWG wire. Wire gauge should be
determined by load application. Wire gauge less than 18 AWG is not
recommended.
1. Make sure no power is supplied to the instrument.
2. Strip the insulation on each wire back ¼-inch. See Figure 12 .
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