Basler Electric BE1-51/27C - Manual (Page 60)

54 9137200998 Rev E
Neutral Time Delay Selection
Step 1. Use the same characteristic curve used in the previous paragraph (Time Delay Selection).
However, the multiples-of-pickup current, time-in-seconds, and the resulting front panel
NEUTRAL TIME DIAL setting can differ.
Step 2. Set the front panel NEUTRAL TIME DELAY as follows:
(a) On the appropriate curve, plot upward from the multiples-of-pickup-current value until the
horizontal line opposite the desired time delay (time-in-seconds) is reached. The setting
curve nearest the plot point should then be entered on the front panel NEUTRAL TIME
DELAY.
(b) Using the timing type B3, Definite Time Curve in the Time Overcurrent Characteristic
Curves chapter as an example, if the overcurrent is expected to be 4 times the pickup point
value and time delay of 4 seconds is desired, plot upward from the point 4 on the
multiples-of-pickup-current axis until the point 4 from the time-in-seconds axis is
crossed. The curve for a setting of 52 crosses the plot point and should be entered on the
front panel NEUTRAL TIME DIAL.
(c) For a lesser overcurrent difference from the pickup point, the time delay will be greater, so
that for a multiple of 3 times the pickup current, the time delay for the previous front panel
setting of 52 will be 5.8 seconds.
VOLTS INHIBIT ADJ or VOLTAGE INHIBIT ADJ Setting
Step 1. Verify that the test setup is performed.
Step 2. Adjust the test voltage to the desired inhibit level (between 40 and 120 Vac).
Step 3. Starting at fully CCW, slowly adjust the front panel VOLTS INHIBIT ADJ or VOLTAGE INHIBIT
ADJ CW until the appropriate front panel VOLTS INHIBIT or VOLTAGE INHIBIT indicator
begins flickering. Slowly continue adjusting CW until the indicator first appears solidly
illuminated (no flicker). Do not turn any farther than is needed to remove any visible flicker. The
voltage inhibit level is now established. If multiple phases are sensed by the relay, all phases
will have the same voltage inhibit level.
Note
Because the lower limit for this pickup is determined by the front panel
TAP selector setting and the front panel TAP (CAL) control position,
ensure that these adjustments have been performed as in the
paragraph TAP and TAP (NEUTRAL) Selector Setting.
INST 1 Control Setting
Step 1. Verify that the test setup is as described in TAP and TAP (NEUTRAL) Selector Setting, Steps 1
through 6.
Step 2. Connect the test setup to the instantaneous 1 element output terminals (2 and 10) as shown in
Figures 30 through 35. The timer should not be connected.
Caution
Steps 3 through 8 provide the application of overcurrent for short
periods to allow adjustment while avoiding overheating of the input
sensing transformers. To avoid damaging the relay, do not attempt to
apply a constant high level of input current for adjustment of the front
panel INST 1, INST 1 (NEUTRAL), or INST 2 controls.
Tests and Adjustments BE1-51/27C