Adtech DCA 114 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
AD TECH instruments are factory calibrated and supplied with
a label detailing the calibration. Adjustments are 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 ADTECH DCA 114 and DCA 115 alarms are single and
dual alarms that accept a process input signal of 1.25 mvdc to
250 vdc or 0-1 to 0-50 made.
The DCA 114 is a single alarm providing a DPDT output and
the DCA 115 is a dual alarm providing 2 SPOT outputs as
standard. DPDT output on DCA 115 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.
Power Option P-1 Non-Isolated 24 vdc provides negative
input signal and negative DC power common rail connection.
3.0 INSTALLATION
The instrument is supplied in a general purpose enclosure as
standard. NEMA 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 input negative of
the ADTECH instrument and left floating at the sensor).
A 12 position barrier terminal block with #6-32 screws and
DCA 114 - DCA 115
DC Current/Voltage Alarms
Instruction Manual
3/8" spacing is provided for 1/0 and power connection.
A housing ground terminal marked G is also provided.
Controls
Internal ZERO and SPAN controls are provided for fine ZERO
and SPAN calibration. External multiturn trip set controls are
provided to set the trip point(s) level on all units. Adjustable
deadband and adjustable time delay control(s) may also be
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 control(s) is accessible through the
instrument front panel and are clearly marked for ease of use.
4.0 MAINTENANCE
These instruments are electronic except for the relay outputs
and require no maintenance except for periodic cleaning and
calibration verification. The standard relay is rated by the
manufacturer for 500,000 1 O amp operations at 30 vdc and
2x10 7 mechanical operations. Relay output(s) 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 CONNECTIONS
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary sheets.
DCA 114
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INPUT -
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CD
CD
24 (+l
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K1A L K1A L
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K1B L
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N
N (- FOR DC)
AC AC
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NOTE: All relays are shown in shelf condition
-1-
DCA 115
DPDT OUTPUT
DCA 115
OPTION O 34
L
INPUT -�
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K1B
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k
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K2B
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k
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DCA