Tempco TEC-2500, Инструкция по эксплуатации

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18
2–4 Power Wiring
The controller is supplied to operate at 11–26VAC/VDC or 90–264VAC. Check that the installation voltage corresponds
to the power rating indicated on the product label before connecting power to the controller.
This equipment is designed for installation in
an enclosure which provides adequate
protection against electrical shock. The enclosure
must be connected to earth ground.
Local requirements regarding electrical installation
should be rigidly observed. Consideration should
be given to prevent unauthorized personnel from
gaining access to the power terminals.
• Before wiring, check the label to verify the correct model
number and options. Switch off the power while checking.
• Care must be taken to ensure that the maximum voltage
ratings specified on the label are not exceeded.
• It is recommended that the power source for these units
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 from being
accessible to human hands and metal tools.
• All wiring must conform to the appropriate standards of
good practice and local codes and regulations. Wiring
must be suitable for the voltage, current, and temperature
ratings of the system.
• The "stripped" leads as specified in figure 2.2 below are
used for power and sensor connections.
• Beware not to over-tighten the terminal screws.
• Unused control terminals should not be used as jumper
points as they may be internally connected, causing
damage to the unit.
• Verify that the ratings of the output devices and the inputs
as specified in chapter 8 are not exceeded.
• Electrical power in industrial environments contain a
certain amount of noise in the form of transient voltage
and spikes. This electrical noise can 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 controller. This wire is a twisted-pair construction with
foil wrap and drain wire. The drain wire is to be attached to
ground at one end only.
2–3 Wiring Precautions