Basler BE-51/27C, Instruction Manual, Page: 9 / 53

BE1-51/27C General Information
1-4
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. Also, 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. They are 0.5 to 12 amperes and 0.1 to 2.4 amperes.
Power Supply
Five power supply options are available. They are:
!
48 Vdc
!
125 Vdc and 100/125 Vac
!
24 Vdc
!
48 Vdc or 125 Vdc and 100/125 Vac (jumper selectable)
!
250 Vdc and 230 Vac
Targets
Single-phase relays have two function targets that indicate when the time delay or instantaneous
elements(s) have operated. On multiple phase relays, additional targets indicate which phase or neutral
elements(s) operated.
Function targets may be specified as either internally operated or current operated by a minimum of 0.2
amperes through the output trip circuit. When current operated, the output circuit must be limited to 30
amperes for 0.2 seconds, 7 amperes for 2 minutes, and 3 amperes continuously. Element targets are
internally operated.
Outputs
Optional normally opened, normally closed, or SPDT auxiliary output contacts may be selected. Contacts
actuate when the output relay is energized. Internally operated front panel mounted targets, and front panel
targets operated by the dc current in the output circuit are available for the time overcurrent and
instantaneous overcurrent functions. Optional front panel mounted
PUSH-TO-ENERGIZE-OUTPUT
pushbuttons allow direct actuation of each output relay for external circuit testing.