Adtech RBA 174 RBA 175 Instruction Manual

1.0 INTRODUCTION
These instructions refer to the above models. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, refer to the Data Bulletin. All
ADTECH instruments are factory calibrated and supplied
with a label detailing the calibration.
normally not necessary. A simple check should be performed
to verify calibration before installation to ensure that it matches
the field requirement.
2.0 GENERAL DESCRIPTION
The ADTE CH RBA 174 and RBA 175 alarms are single and
dual alarms that accept an RTD Resistance input signal of
n
1.5-1,000 and provide relay contact output(s).
The RBA 174 is a single alarm providing a DPDT output and
the RBA 175 is a dual alarm providing 2 SPOT outputs as
standard. DPDT output for RBA 175 is optionally available
and requires the "Wide Line" enclosure.
The single alarm may be a Hi or Low alarm; the dual alarm
may be Hi-Low, Low-Hi, Hi-Hi or Low-Low. Internal jumpers
determine the proper relay(s) action.
The relay coil may be power fail safe (i.e.) energized for
normal conditions or NON-power fail safe (i.e.) energizes on
abnormal conditions.
Unless otherwise specified, the single alarm is set as Hi trip,
power fail safe and the dual alarm as Hi-Low trip power fail
safe.
LED indicator(s) for alarm condition is provided as standard.
Green indicates normal condition and red indicates alarm
condition.
3.0 INSTALLATION
The instrument is supplied in a general purpose enclosure
as standard. N EMA 4, 7 or 12 and plug in chassis enclosures
are optionally available. Installation area/location must
agree with the supplied instruments including operating
temperature and ambient conditions.
Mounting
Refer to the appropriate outline drawing for mounting and
clearance dimensions. The instrument is surface mounted
with two #10-32 screws on 8.00 inch centers.
Electrical Connections
The wire used to connect the instrument to the control
system Input/Output, should be a twisted pair(s) and sized
according to normal practice. Shielded cable is not normally
necessary (if used, the shield must be grounded at the
ADTECH instrument and left floating at the sensor).
A 12 position barrier terminal block with #6-32 screws and
3/8" spacing is provided for 1/0 and power connection.
A housing ground terminal marked G is also provided.
RBA 174- RBA 175
Resistance Bulb Alarms
Instruction Manual
Controls
Internal multiturn ZERO and SPAN controls are provided to
calibrate the ALARM. External multiturn trip set control(s) is
provided to set the trip point(s) level on all units. Adjustable
deadband and adjustable time delay control(s) may also be
Adjustments are provided if specified. If optional calibrated dial(s) for trip set
and/or adjustable deadband control(s) is supplied, they are
normally mounted in the "Wide Line" enclosure.
The external multiturn controls are accessible through the
instrument front panel and are clearly marked for ease of
use.
4.0
These instruments are electronic except for the relay
output(s) and require no maintenance except for periodic
cleaning and calibration verification. The standard relay is
rated by the manufacturer for 500,000 1 0 amp operations
at 30 vdc and 2x10
should be verified at user established time intervals. If the
unit appears to be mis-operating it should be checked in
place per section 6.0 or removed for a bench check per
sections 6.0 and 7.0. MOST problems are traced to field
wiring and/or associated circuits. If the problem appears to
be within the instrument, proceed to sections 6.0 and 7.0.
5.0
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary
sheets.
3WIRE�
K1A *
L
K1Bt*
N (- FOR DC)
AC
L (+ FOR DC)
rFP
-1-
MAINTENANCE
mechanical operations. Relay output(s)
7
CONNECTIONS
RBA 175
RBA 174
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RTD1 MUST BE AT
HIGHER TEMERATURE
2WIRE RTD
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CONNECTION
(DIFFERENTIAL
(3-95)
RBA 175
DPDT OUTPUT
OPTION O 34
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