ACA 140-ACA 142
AC CurrenWoltage Alarms
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 ACA 140 and ACA 142 alarms are single and
dual alarms accepting an AC Current or Voltage input signal
and providing relay contact output(s).
The input can be either 0-5 AMPS or an AC voltage of 0-20 V
to 0-300 Vrange. The instruments can respond either to RMS
value or average value of the input signal. The true RMS
allows wave forms with 5:1 as crest factor.
The input frequency range is 25 Hz to 400 Hz. For the highest
accuracy calibrate the instrument at the installed operating
frequency.
The ACA 140 is a single alarm providing a DPDT output and
the ACA 142 is a dual alarm providing 2 SPDT outputs as
standard. DPDT output 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-powerfail 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. 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.
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 atthe ADTE CH 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.
Controls
Internal ZERO and SPAN controls are provided for calibration.
External mult�urn trip set control(s) is provided to set the trip
point(s) level on all units. Adjustable dead band and adjustable
time delay control(s) may also be provided if specified. If
optional calibrated dial(s) for trip set and/or adjustable dead
band 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 is clearly marked for ease of use.
4.0 MAINTENANCE
These instruments are electronic except for the relay(s) and
require no maintenance except for periodic cleaning and
calibration verification. 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.
ACA 140
INPUT
OT05AMPS {
CD
AC ONLY
CD
OR
AC VOLTAGE {
CD
INPUT ONLY
©
ACA 140 SINGLE
ACA 142DUAL
ACA 142
INPUT
{
CD
OTO 5AMPS
AC ONLY
CD
OR
{
CD
AC VOLTAGE
INPUT ONLY
©
ACA 142
DPDT OUTPUT
OPTION O 34
®
K1A t
*
©
CD
©
Mounting
K1A L
=¥
Refer to the appropriate outline drawing for mounting and
©
©
CD
©
®
®
®
@
K-1t
-f
K2A L
-f
©
®
©
®
CD
K1Bk
®
clearance dimensions. The instrument is surface mounted
with two #10-32 screws on 8.00 inch centers.
K1Bt
*
N (- FOR DC)
AC
L (+ FOR DC)
r-FP
-1-
K-2t
-f
N (- FOR DC)
AC
L (+ FOR DC)
r-FP
©
®
®
(TB2)
...r:--
@)
®
®
®
K2Bk
®
(TB2)
...r:--
@
®
190-A-OOOACA-A