BE1-32R, -32 O/U TESTING
5-3
NOTE
Units with inverse or instantaneous timing options will not have a multiplier switch.
Definite Time (Underpower)
Step 1.
Make the following relay front panel adjustments:
RANGE switch - LOW
UNDER pickup control - fully CW (95 %)
UNDER TIME DELAY - 01
OVER and UNDER multiplier switches (X) - 0.1
OVER TAP pickup selector B
Step 2.
With the relay powered up, apply nominal input voltage according to sensing input type and range.
Step 3.
Apply a current source to the relay current sensing inputs and increase the source until it is greater
than the underpower pickup point.
Step 4.
Remove the current source so that the UNDER PICKUP LED Illuminates and record the interval
from underpower pickup to output contact actuation.
RESULT:
Setting
Multiplier Switch
Expected Time
01
0.1
0.1 ±0.05 seconds
Step 5.
Repeat Steps 3 and 4 with UNDER TIME DELAY and multiplier switch (X) settings as shown in the
RESULTS below. Record the interval from underpower pickup to output contact actuation.
RESULTS:
Setting
Multiplier Switch
Expected Time
05
0.1
0.5 ±0.05 seconds
50
1.0
50.0 ±2.50 seconds
Inverse Time (Overpower)
Step 1.
Connect timer/counter so that timing begins when sensing input current is applied and stops when
the trip output circuit is energized.
Step 2.
Make the following relay front panel adjustments:
RANGE switch - LOW
OVER TAP pickup selector - B
OVER TIME DELAY - 05
OVER multiplier switch (X) - 0.1
UNDER pickup control - fully CCW
Step 3.
Adjust (but do not apply) the current source to a level four times the pickup point (TAP B) setting.
Apply the current and measure the interval from initiation to output actuation.
RESULT:
The measured interval should be 0.460 ±0.050 seconds.
Step 4.
Repeat Steps 1 through 3 for sensing input power magnitudes of 1.5 times and 8 times the TAP B
watts setting.
RESULTS:
Setting
Actual Time
1.5 X
1.048 ± 0.053 seconds
8.0 X
0.282 ± 0.050 seconds
This concludes the operational test.
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