Section 2
Page 2 - 6
MODEL 346 INSTALLATION AND OPERATION MANUAL
HA243821
Issue 5 Mar 98
90-130V
180-260V
Slider switch
(Up for 110Volts
Down for 240 Volts)
2.3.1 SUPPLY VOLTAGE WIRING
This product is designed for use with a filtered Mains supply. If a filtered supply is not available, a Mains Lead
Filter Option is available from the manufacturer.
WARNING
MAINS (LINE) EARTH MUST BE MADE TO THE SAFETY EARTH CONNECTION AS SHOWN IN FIGURE 2.3,
PREFERABLY USING AN M5 SOLDER OR CRIMP TAG. UNDER NO CIRCUMSTANCES MAY THE SAFETY
EARTH BE CONNECTED TO THE UNMARKED TERMINAL NEXT TO THE LINE TERMINAL.
CAUTION
24V AC SUPPLIES MUST BE ISOLATED FROM MAINS. 24V DC SUPPLIES MUST EITHER BE ISOLATED OR
NEGATIVE EARTH. FAILURE TO ENSURE THIS WILL RESULT IN THE RUPTURING OF THE RECORDER
INPUT FUSE OR THE TRIPPING OF ANY RESIDUAL CURRENT DEVICE IN THE CIRCUIT.
Withdraw the recorder from the case. Note the Recorder ON / OFF switch on the panel just below the jacking bolt
This switch must be in the OFF position when the chassis is returned to the case after Supply Voltage wiring.
Locate the supply voltage selector switch on the right-hand side of the chassis (figure 2.3.1). Set this switch to
agree with the voltage to be connected to the case terminals. Locate the line fuse on the main board, adjacent to
the line input terminal. If necessary change the fuse to suit the supply voltage. (1A for 120V. supply, 500mA for
240V supply). See section 6 for appropriate fuse part numbers.
Figure 2.3.1 Voltage selector switch settings
2.3.2 SIGNAL WIRING
The recorder can be connected and configured to operate with a variety of signal sources such as: Thermocou-
ples, RTDs, DC Current, DC Voltage and Contact (event) Inputs. The configuration of the recorder for a specific
type of input may require the moving of one or more links on the channel amplifier card and/or the use of input
conditioning circuits such as shunts and voltage dividers. The positions of the various connectors on the terminal
panel are shown in figure 2.3. Connection diagrams for various input sources are shown in figures 2.3.2a to
2.3.2e, and the positions of the circuit board linkss are described below in section 2.4.
THERMOCOUPLE INPUTS
Thermocouples are connected directly to the case terminal board using the + and - terminals for the designated
channel, as shown in figure 2.3.2a below.
DIRECT VOLTAGE INPUTS UP TO 5 VOLTS DC
Voltage inputs to a maximum of 5 Vdc are connected directly to the recorder input connectors, see figure 2.3.2a.
Figure 2.3.2a
Thermocouples and dc inputs up to 5 Volts
+
–
Thermocouple inputs
or dc voltage inputs up
to 5 Volts
CAUTION
VOLTAGES ABOVE
±
24 VOLTS WILL DAMAGE THE
INPUT CIRCUITRY.
