Myron L 762 - Manual (Page 7)

Installation
2.3.2 CELL INSTALLATION
STEP 1 Place the Cell’s interface cable and water tight cable
restraint into the enclosure’s appropriate access hole.
STEP 2 Neatly connect the cable wires to the Control board’s
TB3 terminal block connectors as shown in Fig. 2-3.
2.3.3 ALARM RELAY INSTALLATION
STEP 1 Place the user supplied Alarm relay interface cable and
water tight cable restraint into the enclosure’s
appropriate access hole.
STEP 2 Neatly connect cable wires to the Control board’s TB2
terminal connectors as shown in Fig. 2-3 and explained
below:
All Myron L Company Resistivity Monitor/Controllers are
equipped with a relay which is designed to energize/deenergize
when the set point is crossed. (See P.11, Sec. 4.3.3. for set point
adjustment procedure) The relay energizes on decreasing
readings.
Since various devices (alarms, solenoid valves, etc.) controlled
by your Myron L instrument can operate on different voltages,
the power the relay is to control must be connected by you. Any
common AC or DC voltage may be used, provided the current
load does not exceed 10 amps.
2.4 OPTIONAL INTERFACE CONNECTIONS
The standard 750/760 Series Monitors can be configured with a
combination of available options. Therefore, based upon the
user requirements the electrical installation of 1 or more of the
following options may be required.
2.4.1 220 VAC CONVERSION
STEP 1 Verify that the Facility’s main AC power source is
turned “OFF” or disconnected.
STEP 2 Locate and remove Control board jumpers E1 and E3.
(See Fig. 2-3 and 2-4.)
STEP 3 Using one of the removed jumpers, insert it into jumper
E2’s connection holes as shown in Fig. 2-4.
A typical example is shown above. The relay contacts are shown
in the de-energized position. When energized, the Common
(COM) will disconnect from the Normally Closed (NC) contact
and connect to the Normally Open (NO) contact. Devices may
be operated using either the Normally Open contact or Normally
Closed contact; or both relay contacts may be used to activate
two devices of the same voltage.
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