Basler Electric BE1-51 - Manual (Page 52)

46 9137200997 Rev G
Step 1. Referring to the appropriate time overcurrent characteristic curve, select the desired time delay
on the front panel TIME DIAL for the anticipated input overcurrent difference (multiples-of-
pickup current) from the selected time overcurrent pickup point as follows:
(Selected Pickup Point) - (Anticipated Input Overcurrent) = Overcurrent Difference from Pickup
Step 2. Set the front panel TIME DIAL 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 TIME DIAL.
(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 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.
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.
INST 1 Control Setting
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.
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 24 through 27. The timer should not be connected.
Tests and Adjustments BE1-51