6.0 SET UP AND CALIBRATION
All ADTE CH units are factory calibrated per your instructions.
Usually, a complete recalibration is not required unless it is
required to change input types, relay action, or the range of the
unit. Most calibrations will only require an alarm SET POINT
adjustment and the associated options like adjustable DEAD
BAND or TIME DELAY.
The calibration process is broken into 5 separate steps as
follows:
Input and Output Configuration ............................... Sec 6.1
Determining the MAJOR RANGE setting ................ Sec 6.2
Determining the COARSE ZERO
and SPAN settings ................................................. Sec 6.3
FINE ZERO and SPAN adjustment ......................... Sec 6.4
Alarm SET POINT, DEAD BAND, and
TIME DELAY adjustment... ...................................... Sec 6.5
6.1 INPUT AND OUTPUT CONFIGURATION
6.11 INPUT CONFIGURATION
The ACA 140/141 alarms offer either True RMS or Average
Responding measurements. Table 4 is used to select the type
of measurement for the application. NOTE: While making
jumper selections on the pc-board it is important that no
external input is applied to the terminal block.
6.12 OUTPUT CONFIGURATION
All ADTECH series 100 alarms allow the customer to change
the factory set relay action. The Alarm(s) may be configured
for LOW alarm (Alarm condition when the input falls below the
set point) or HIGH alarm (Alarm condition when input rises
above the set point) as required by your particular application.
Table 1 shows the jumper(s) setting required to set the
appropriate alarm type.
In addition to the alarm type, the mode in which the relay is
energized may be changed. The Relay(s) may be either
energized in a FAILSAFE mode (Relay energized under
normal, non alarm conditions) or NON-FAILSAFE mode (Relay
De-energized under normal, non alarm conditions) as per the
application. Use Table 1 to set the jumper(s) as required.
6.13 COMMON EXAMPLES
Example 1 -Single Alarm (Kl), High Alarm and Failsafe.
• Jumper J03 set to position
A,
sets the High Alarm type
for relay Kl.
• Jumper J01 set to position A, sets the relay to be
energized in the Failsafe Mode.
Example 2 - Dual Alarm (Kl and K2), Kl - High Alarm and
Failsafe; K2 -Low Alarm and Failsafe.
• Jumper J03 set to position A, sets the High Alarm type
for relay Kl.
• Jumper J01 set to position
A,
sets the Relay Kl to be
energized in the Failsafe Mode.
• Jumper J04 set to position B, sets the LOW Alarm type
for relay K2.
• Jumper J02 set to position
A,
sets the Relay K2 to be
energized in the Failsafe Mode.
6.2 DETERMINING MAJOR RANGE
The ADTECH 1 00 Series of Alarms is designed to provide a
wide input range compatibility. This is accomplished with a
technique that first conditions the input to a MAJOR RANGE.
This ranging technique assures the highest performance from
our units and maintains a standard, easy to use calibration
method. You can then elevate or suppress up to 85% of the
MAJOR RANGE with the COARSE ZERO settings, and also
scale to less than 15% of the MAJOR RANGE with the
COARSESPANsettings. TheFINEZERO andSPAN controls
provide 12% adjustment of the MAJOR RANGE.
The input SPAN and ZERO values are used to select the
MAJOR RANGE from table 4. The MAJOR RANGE is
determined from the larger of the SPAN, or ZERO x 1.17
(ignoring the sign) as per the following examples.
Example 1: Input of 1 to 5 � �ac
�
SPAN=(5 - 1)=4
ZERO= 1 x 1.17 = 1.17
Span dominates the selection in this case. You would select
the MAJOR RANGE that is greater than or equal to 4 amp-ac
from table 4 (selected value 5. 76 Aac).
Example 2: Input of 80 to 100 Vac (RMS)
SPAN= (100-80) = 20
ZERO = 80 x 1.17 = 93.6
This example shows the selection based on the ZERO value.
Fromtable4,youwouldselect aMAJORRANGE of97.26 Vac.
6.3 COARSE ZERO AND SPAN SETTINGS
Once the MAJOR RANGE is selected, one can determine the
COARSE ZERO and SPAN settings. The procedure involves
dividing both the ZERO and SPAN values by the MAJOR
RANGE to determine a percentage. Then look up the proper
settings from tables 2 and 3. We will use values from the first
example above to illustrate the procedure.
Example 1: Input of 1 to 5 amp-ac (AVG)
SPAN of (5 -1) = 4
ZERO of 1 x 1.17= 1.17
MAJOR RANGE of 5. 76 Aac
%SPAN of MAJOR RANGE (4/5.76) x 100% = 69.4%
%ZERO of MAJOR RANGE (1/5.76) x 100% = 17.4%
Simply find the range that includes the percentages you just
calculated in the appropriate table, and select the appropriate
jumpers.
6.4 FINE ZERO AND SPAN ADJUSTMENT
The FINE ZERO and SPAN controls provide an adjustment of
12% of the MAJOR RANGE selected. This is an INTERNAL
adjustment. You will need a voltmeter with resolution to 1 mV
to do the fine adjustment. The procedure is as follows:
-2-
6.41 Connect the voltmeter from GND(-) to VNORM1 (+)
on the test point header H3 (Refer to figure 2 for
locations.) Apply ZERO input to the unit, and adjust
the ZERO ADJ. potentiometer until the meter reads
o Vdc +/-2 mV.
6.42 Connect the voltmeter from +VR(-) to VNORM1 (+)
on the test point header. Apply full scale to the unit,
and adjust the SPAN ADJ. potentiometer until the
190-A-000ACA-A