UDB97
Up-Down Ramp Buffer
Instruction Manual
1.0 INTRODUCTION
These instructions refer to the above model. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, see page 4 or refer to the Data
Bulletin. All ADTECH 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 UDB 97 Non-Isolated Up-Down Ramp Buffer
provides supervisory process control. A contact change or a
pulse input ramps the standard control signal output of 1-5 vdc
or 4-20 ma de up or down or holds the output signal at the
desired level.
Two independent contact inputs control the direction of the
output of the ramp and/or hold function.
Power Option P 1 Non-Isolated 24 vdc provides negative
output signal and negative DC power common rail connection.
The output is a true current source and provides process
signals such as 4-20 ma, 0-1 ma, 0-1 0 ma, 1-5 ma and
10-50 ma de or alternatively, a voltage signal of 5 vdc full
scale. Other current and voltage
Inputs/Outputs (1/0)
are
available as specified on the Data Bulletin.
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
1/0
should be a twisted pair(s) and sized according to normal
practice.
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.
Controls
Multiturn ZERO, SPAN, UPRATE and DOWNRATE controls
are provided to calibrate the instrument. The multiturn controls
are accessible through the instrument front panel and are
clearly marked for ease of use.
4.0 MAINTENANCE
These instruments are electronic and require no maintenance
except periodic cleaning and calibration verification. If the unit
appears to be mis-operating it should be checked as installed
per section 6.0 or removed for a bench check per sections
6.0-7.0. MOST problems are traced to field wiring and/or
associated circuits. If the problem appears to be with 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.
RAMP ..r:--
@
HOLD�
©
OUTPUT
(
-)
©
(+)
©
UP
__r:--
(j)
DOWN�
©
N (- FOR DC)
®
AC
L
(+
FOR DC)
@
rFP
-1-
190-A-000029-A
