Basler BE1-27 Manual - page 3
BE1-27, 59, 27/59
SPECIFICATIONS
F igure 1 - Functional Block D iagram
FUNCTIONAL DESCRIPTION
The specifications on these pages define the many
features and options that can be combined to exactly
satisfy an application requirement. The block diagram,
Figure 1, illustrates how the various standard features, as
well as options, function together.
INPUTS
Voltage Sens ing
A system voltage transformer with standard 120/240 Volt
secondary supplies the Under/OveNoltage Relay's input
transformer with a single-phase voltage from the moni
tor
ed circuit. This voltage is scaled, filtered,
and rectified
to represent the voltage magnitude of the monitored
circuit.
Nominal sensing input ratings, defined by the style
number, are 120 or 240 Vac with a maximum burden of 1
VA single phase at 40 to 70 Hz. The maximum continuous
voltage rating is 360 Vac for 120 Vac nominal, and 480 Vac
for 240 Vac nominal.
System Voltages
The BE1-27, BE1-59, and BE1-27/59 relays are available
with three sensing input ranges. The 55 to 160V range is
intended for use with nominal system voltages of 120V or
69V (120/¥3). The 11 0 to 320 volt range is intended for use
with nominal system voltages of 240V, 208V (120 x v'3), or
277V (480/v'3). The
1
to 40V range is intended for use with
a wye/broken delta
VT
configuration with 120V or 69V
(120/v'3) line-to-ground secondary voltages.
Power Supply
One of five power supply types may be selected to
provide internal operating power. They are described in
Table 1.
Tabl e 1 - Power Suppl y Opt ions
Type
K
J
L
y
z
Nominal
48 Vdc
125 Vdc
24 Vdc
48 Vdc
250 Vdc
Voltage
120 Vac
125 Vdc
230 Vac
Burden
6.5 W
7.5
w
?.OW
6.5 W
9.5 w
19 VA
7.5 VA
25.0 VA
PICKUP SETTINGS
Front panel potentiometers, continuously adjustable over
the range defined by the style number, establish the
voltage pickup levels. One potentiometer is provided for
each timed and instantaneous function. Actual pickup is
within 2% of 0.5 volt of the setting, whichever is greater.
Dropout is within 2% of actual pickup, occurring in 50
milliseconds or less.
PICKUP COMPARATORS
The monitored system voltage is compared individually to
each pickup setting. When the system voltage is greater
than the timed oveNoltage setting, the appropriate pickup
3
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