Basler Electric BE1-51/27C - Manual (Page 9)

9137200998 Rev E 3
This type of non-integrating time delay characteristic exhibits a dynamic characteristic that is immediately
responsive to changes of the applied multiple of pickup current.
Integrating Timing
Timing option Z3 and the characteristic curves available for that option uses integrating timing. Integrating
timing is accomplished by summing time increments that are based on the magnitude of the applied
multiple of pickup current, the time curve characteristic selected, and the time dial value. These time
increments are summed until a predetermined value is exceeded, then a time trip output signal is
generated.
This type of integrating time delay characteristic simulates the operating characteristics of an
electromechanical overcurrent relay.
Built-In Test
A built-in test (BIT) switch mounted on the Logic Board provides diagnostic troubleshooting and
calibration.
Options
Timing
An extended timing option multiplies by approximately 5.7, the standard time delays. The resulting curves
are shown following the standard curves in the Time Overcurrent Characteristic Curves chapter.
When timing option Z1, Z2, or Z3 is specified, a printed circuit board mounted selector switch allows a
choice of up to sixteen different time overcurrent functions. Timing option Z1 or Z3 may be further
specified as standard or extended time, depending upon option 2 selection.
Sensing Input Type
When single-phase, two-phase-and-neutral, three-phase, or three-phase-and-neutral sensing has been
specified, the front panel TAP selector and the front panel TAP CAL control set the pickup point for all
phases. An independent front panel TAP (NEUTRAL) selector and front panel CAL (NEUTRAL) control
set the neutral pickup point. In addition, for three-phase-and-neutral sensing units, one of the seven
sensing input range combinations must be specified.
Relay circuits inhibit the phase-element time overcurrent operation for a specific phase if the monitored ac
voltage exceeds a preselected level. The voltage level is established by a front panel VOLTS ADJ control
and all phases are inhibited at the same voltage level. Neutral overcurrent elements are not inhibited.
When the voltage inhibit level is exceeded, front panel INHIBIT LED is lit for the affected phase and the
front panel TIMING LED for that particular phase extinguishes.
Sensing Input Range
For three-phase-and-neutral sensing units, input ranges are:
•
0.5 to 4.0 amperes (phase and neutral)
•
1.5 to 12 amperes (phase) and 0.5 to 4.0 amperes (neutral)
•
0.5 to 4 amperes (phase) and 1.5 to 12 amperes (neutral)
•
1.5 to 12 amperes (phase and neutral)
•
0.1 to 0.8 amperes (phase and neutral)
•
0.3 to 2.4 amperes (phase) and 0.1 to 0.8 amperes (neutral)
•
0.3 to 2.4 amperes (phase and neutral)
For all other units, two ranges are available: 0.5 to 12 amperes and 0.1 to 2.4 amperes.
Power Supply
Five power supply options are available:
BE1-51/27C Introduction