–15–
M-0329B Instruction Book
Test Setup
Make the electrical connections as required in
Figure 10. The functional indicator lamps are
suggested to facilitate testing and can be eliminated
if other methods are used.
Procedure for Determining Voltage
Bandcenter
When checking the voltage
BANDCENTER
settings, the exact voltage where the
BLOCK
RAISE/LOWER
and
LOWER
LEDs light should be
recorded. The voltage level Bandcenter is
calculated as the average of these voltages:
V
Block Lower
+ V
Block Raise
Bandcenter Voltage =
2
The voltage at which the
BLOCK RAISE/LOWER
and
LOWER
LEDs, and the functional indicators
shown in Figure 9 turn on should be recorded in all
cases. The band-edge hysteresis causes the LEDs
to turn on and off at slightly different voltages.
Test Procedure
Refer to Figure 1 for a diagram depicting
Bandcenter, Bandwidth and Fixed Deadband
voltage levels.
Bandcenter Test
1.
Set the
BANDWIDTH
dial at 6 V.
2.
Set the
BANDCENTER
dial at 120 V
and check the actual Bandcenter by
varying the Voltage Input at TB1-3 to
TB1-4. Be sure to position the
BANDCENTER
dial pointer exactly in
the center of the line on the dial grid.
3.
Repeat Step 2 at 108 V rms and 132 V
rms.
4.
The calculated values should be within
±1 V rms of the dial setting.
Bandwidth Test
1.
The
BANDWIDTH
dial was previously
set at 6 V Bandwidth. Check the actual
Bandwidth by calculating the difference
between V
Block Lower
and V
Block Raise
.
2.
Repeat Step 1 at 12 V Bandwidth, 18 V
Bandwidth, and 24 V Bandwidth.
3.
The Bandwidth should be within ±10%
of setting.
Deadband (Block Raise to Block Lower) Test
1.
Return the
BANDWIDTH
dial to 6 V.
2.
Check the actual Bandwidth between
the V
Block Raise
and V
Lower
by recording the
voltage at which the
LOWER
LED turns
on.
3.
Reduce the input voltage until the Block
Raise functional indicator turns on.
4.
Calculate the Deadband = V
Lower
- V
Block
Raise
. The setting is selectable by the
customer.
5.
The calculated Deadband should be
within ±3% of the setting.
Lower Timer Delay Test
1.
Set the
TIME DELAY
potentiometer to
1 second (minimum).
2.
Increase the input voltage until the
LOWER
LED lights. Using a stopwatch,
measure the time required for the
LOWER
relay to pick up.
3.
Adjust the
TIME DELAY
potentiometer
to 30 seconds (maximum) and repeat
Step 2.
4.
The measured times should be within
±10% of setting.
Fixed Alarm Time Delay Test
1.
Set the
BANDCENTER
control to 120 V
rms.
2.
Set the
BANDWIDTH
control to 6 V.
3.
Decrease the input voltage until the
BLOCK RAISE/LOWER
LED lights.
Using a stopwatch, measure the time
required for the
ALARM
relay to
de-energize.
4.
The measured time should be 180
seconds
K
20%.
5.
Return the input voltage to 120 V rms or
until the
BLOCK RAISE/LOWER
LED
turns off.
6.
Increase the voltage potential until the
BLOCK RAISE/LOWER
LED lights.
Measure the time required for the
ALARM
relay to de-energize.
7.
Remove the 120 V ac power source
from the M-0329B. The
ALARM
relay
should de-energize without a time delay.