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TEMPCO s.a. 4e ave. N°114, Z.I. des Hauts Sarts, B-4040 Herstal, Belgique. T:(32)04-2649458, F:(32)04-2649476, www.tempco.be, [email protected]
Les photos et caractéristiques présentés dans ce catalogue sont données à titre indicatif et ne sont pas contractuelles.
3.A.01.450-E-100910 page 4/7
ELECTRICAL CONNECTIONS
1. Cover
The amplifier-relay unit has an easy to remove housing.
Remove the three (3) screws as shown in Fig. 5 and slide
the housing off. Make all the electrical connections before
reinstalling and refastening the housing.
2. Conduit
Electrical access to the connection box portion of the relay
housing is by bottom opening for 3/4˝ conduit. Use of flexi-
ble conduit is recommended. It should be supported from
the panel or other suitable surface to prevent the wiring sys-
tem from exerting undue strain on the instrument. See Fig.
5.
3. Terminal or Connection Board Layout
In Fig. 6,”Terminal Board”,
Section A
contains the connec-
tions for the load or slave relay actuated by the high or right
set-point. This relay is a double pole, double throw type. The
two top connections are normally closed, the two middle
connections are normally open, and the bottom connec-
tions are the common pair. The relay is in its normal or De-
Energized position when pressure is below the right hand
set-point.
Section D
is exactly the same as Section A except that its
load or slave relay is controlled by the low or left set-point.
The De-Energized position is below the left hand pointer
set-point.
Section B
contains the external connections to the holding
coil circuit for the high or right set-point relay and
Section
C
contains similar connections for the low or left set-point
relay. The function and use of these connections varies
somewhat depending on the circuit style of the instrument.
See paragraphs 5 and 6 for details.
Section E
contains the power connections for the control
unit transformer primary. The transformer in turn supplies
reduced voltage power for the LED, phototransistor, ampli-
fier unit, and load relay pull in and holding coils. Connections
must always be made to this section in order to put the unit
in operation. Standard units are designed for 117 VAC input
to the transformer. Special units are also available for other
voltages.
Separate Ground Wire
attachment is provided for by a
No. 6-32 screw on the mounting bracket near the conduit
opening. An additional ground wire connection is located on
the side of the gage body for use when the amplifier-relay
unit is mounted remotely.
Single Set-Point
instruments are furnished with the right or
high set-point components and circuitry in place. These are
connected to Sections A and B of the terminal board. The
left or low set-point components are omitted.
4. Circuit Style
The Photohelic
®
is available with several factory installed
optional internal circuits. They are identified as to style by a
label shown in Fig. 7. This label is mounted prominently on
the terminal board of each instrument. The letter H denotes
a circuit in which the relay can be made to latch or remain
energized after pressure increase to its set-point.
4-3/8 [111.13]
COVER MOUNTING SCREWS
SUPPORT CONDUIT
FROM PANEL
COVER PULL
OUT
FLEXIBLE CONDUIT
Fig. 5
Mounting Details
SECTION B
SECTION C
SECTION A
SECTION D
SECTION E
Fig. 6
Terminal Board
CAUTION: Do not apply electrical
current to terminals in sections B and C.
CIRCUIT:
POWER SUPPLY:
CONTACT RATING:
Fig. 7
Circuit Label
