meter reads O Vdc +/- 2 mV.
6.43 Recheck ZERO and SPAN values per step 1 and 2
above, and adjust the appropriate controls as
necessary.
6.5 ALARM SET POINT, DEAD BAND AND
TIME DELAY ADJUSTMENT
Alarm SET POINT, and the optional DEAD BAND and TIME
DELAY controls are accessed from the front of the unit. The
adjustment procedure is described for one alarm, and applies
to each alarm of a dual alarm unit.
6.51 SET POINT
The Alarm SET POINT adjustment is made by applying the
desired input value, and adjusting the SET POINT
potentiometer until the alarm changes from normal (GREEN
LED indication) to alarm (RED LED indication). IT IS VERY
IMPORTANT thatthe potentiometer be adjustedfromthe non
alarm condition to the alarm condition to insure the proper
alarm settino.
TABLE
1
"RELAY ACTION JUMPER SELECTION
RELAY
RELAY
CONFIGURATION
K1
Low Alarm
J03-B
Hinh Alarm
J03-A
Non-Failsafe
J01-B
Failsafe
J01=A
TABLE 2
COURSE SPAN
K2
J04-B
J04-A
J02-B
J02=A
PERCENT OF
JUMPER POSITION
MAJ. RANGE
JS3
100 - 90
A
90 -
79
A
79 -
68
A
68
57
A
57 -
46
B
46 -
35
B
35 -
24
B
24 -
11
B
TABLE3
COURSE ZERO
JS2
JS1
A
A
A
B
B
A
B
B
A
A
A
B
B
A
B
B
PERCENT OF
JUMPER POSITION
MAJ.
RANGE
JZ3
JZ2
JZ1
88 - 74
A
A
A
74 - 63
A
A
B
63 - 52
A
B
A
52 - 40
A
B
B
40 - 29
B
A
A
29 - 17
B
A
B
17 - 6
B
B
A
6 - /-6\
B
B
B
TABLE4
ACA 140/ACA 142 MAJOR RANGE JUMPER SELECTION
INPUT
MAJOR
JUMPER
TYPE
RANGE
J1
J2
JR1
JR2
JR3
VOLTAGE /RMS\
24.32V
A
B
B
OUT
B
97.26V
A
B
B
OUT
A
389.12v·
A
A
B
OUT
A
VOLTAGE /AVG\
21.9V
B
B
B
OUT
B
87.58V
B
B
B
OUT
A
350.33V•
B
A
B
OUT
A
CURRENT /RMS\
1.6A
A
B
B
OUT
A
6.4A
A
B
B
OUT
A
CURRENT /AVG\
1.44A
B
B
B
OUT
A
5.76A
B
A
B
OUT
A
•Maximum applied input voltage is 300 Vrms
6.52 DEAD BAND
All ADTECH Alarms come with a fixed 0.5% of SPAN DEAD
BAND setting. We supply an adjustable DEAD BAND as an
option to the unit. This procedure applies only to the optional
DEAD BAND adjustment.
The SET POINT should be set per the instructions. Adjust the
input to the unit until it goes into an alarm state (RED LED
indication). Turn the DEAD BAND potentiometer clockwise (to
increase the DEAD BAND beyond your desired setting). Re
adjust the input to the level you want to return to normal alarm
state. Adjustthe DEAD BAND potentiometer counterclockwise
until the unit returns to normal (GREEN LED indication).
6.53 TIME DELAY
AD TECH alarms can be supplied with adjustable TIME DELAY.
The function helps prevent nuisance alarms when the input
signal is noisy.
The TIME DELAY is adjustable form less than 1 second to a
maximum of 25 seconds. Turning the TIME DELAY
potentiometer clockwise increases the time delay. Since the
adjustment is a blind setting, you adjust to a desired TIME
DELAY through repeated trials. Toggle the input value from
normal to alarm and measure the time until the relay operates
(GREEN to RED LED indication).
7.0 FIELD TROUBLE SHOOTING GUIDE
This section offers a simple, first level trouble-shooting aid for
an apparent instrument malfunction.
SYMPTOM
No output
CORRECTIVE ACTION
1. Check the input and output connections
carefully.
2. Check that the power supply polarity is
correct and that power is present on the
instrument terminals.
3. Check that the input source(s) is correct
and that it changes magnitude between
zero and full scale values when so
adjusted.
The following information is provided for a qualified technician
or serviceman as check points for use in internal
troubleshooting.
-3-
CHECKPOINT
VOLTAGE
fH3 LABEU
fVdc)
+24V
26+/-4
+V
8+/-0.5
+VR
-5+/-0.5
-V
-8+/-0.5
-VR
-5+/-0.25
VNORM1
0 to 5*
Note:
All Test Points Located at Header, (H3).
All Test Points With Respect to "GND" at Head.
"Varies wtth Zero to Full scale Input
ACA 140-ACA 142