Xylem CR500 CIRCULAR CHART RECORDERS - Manual (Page 7)

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Wiring Precautions
1) Before wiring, verify the label for correct model number and options. Switch off
the power when checking.
2) Care must be taken to ensure that maximum voltage rating specified on the label
is not exceeded.
3) It is recommended that power of these units to be protected by fuses or circuit
breakers rated at the minimum value possible.
All units should be installed inside
a suitably grounded metal enclosure to prevent live parts being accessible from
human hands and metal tools.
4) All wiring must conform to appropriate standards of good practice and local
codes and regulations. Wiring must be suitable for maximum voltage, current,
and temperature rating of the system.
5) Take care not to over-tighten the terminal screws.
6) Unused control terminals should not be used as jumper points as they may be
internally connected, causing damage to the unit.
7) Verify that the ratings of the output devices and the inputs are not exceeded.
Refer to Specifications (Page 27).
8) Electric power in industrial environments contains a certain amount of noise in
the form of transient voltage and spikes. This electrical noise can enter and
adversely affect the operation of microprocessor-based controls. For this reason,
we strongly recommend the use of shielded thermocouple extension wire, which
connects the sensor to the unit. This wire is a twisted-pair construction with foil
wraps and drains wire. The drain wire is to be attached to earth ground at the
sensor end only.
Power Wiring
The unit is supplied to operate at 110/220VAC 50/60Hz. Check that the installation
voltage corresponds with the power rating indicated on the product label before
connecting power to the unit.
The recorder uses AC power when it is operating normally. The battery back-up option
on ink recorders will allow the recorder to operate for approximately 48 hours in case of a
power loss. The AC input can be fused with a 250VAC, .5 Amp fuse.
In order to connect the recorder to the main AC power, you must first gain access to the
PC board that is mounted to the back of the chart plate. Your recorder will have a hinged
chart plate held in place by two (2) screws located on the right hand side of the chart
plate. Remove these two screws and open the hinged chart plate. If you are not sure how