Hach 1950Plus, Инструкция по эксплуатации инструмента, Страница: 39 / 188

Section 2
Page 39
UVTOCUnpacking Installation Setup.fm
Wiring the Relays
2.3 Wiring the Relays
Relays S1 through S5
There are five single-pole changeover relays with volt-free contacts. Each of
these relays can be mapped to output the status of Alarm 1, Alarm 2, Online,
Offline, Maintenance request, and Fault. See section
5.2.6.3 on page 78 for
relay mapping details.
Current to the relay contacts
for ac power must be limited to the
maximum listed in
Technical Specifications on
page 13
. 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 fuse or with a switched
circuit breaker with a current rating
not to exceed the relay contact
specification.
Each relay may be selected (via the software) as normally energized or
normally de-energized. An illuminated LED indicates an energized relay. In
either condition (energized or de-energized), both normally open and
normally closed contacts are available.
Note that a normally energized relay will indicate the mapped condition when
power is lost.
The analyzer contains relays designed for use with either high voltage or
low voltage (see
Technical Specifications on page 13 ), but not a combination
of both high and low voltage.
Wire gauge should be determined by load application, connector size, and
local electrical code. Refer to your applicable local regulations and
Technical Specifications on page 13 .
Important Note: The analyzer circuit board components are sensitive to static
electricity damage. Do not touch circuit boards or their components without wearing a
properly grounded wrist strap. See
section 7.1, Electrostatic Discharge (ESD)
Considerations on page 111 .
1. Make sure no power is supplied to the instrument.
2. If using double-insulated wire, strip the outside insulation back 2.5 cm
(1 inch). Strip the outside insulation of each individual wire back 1 cm
(¼-inch). See
Figure 19 . If using individual wires, route the wires through
the wire track at the lower rear of the wiring compartment.
3. Insert the wire ends into the connector (see Figure 18 ) until the insulation
seats against the connector. (Do not seat the insulation under the
terminal pinch plates.)
4. Tighten the screws on the top of the connector to secure the wires.
Tug lightly to ensure the wire is properly seated.
5. Supply power to the instrument when all connections are complete and
the upper enclosure door is securely closed.