BE1-951
General Information
1-9
Real Time Clock
Accuracy:
1 second per day at 25
C (free running) or
±2 milliseconds (with IRIG synchronization)
Resolution:
1 millisecond
Date and Time Setting Provisions:
Front panel, communications port, and IRIG.
Leap year and selectable daylight saving time
correction provided.
Clock Power Supply Holdup
Capacitor:
8 to 24 hours, depending on conditions
Battery:
Greater than 5 years.
Backup Battery (Optional):
Lithium battery 3.6 Vdc, 0.95 AH
(Basler P/N: 9 3187 00 012)
(Applied Power P/N: BM551902)
IRIG
Supports IRIG Standard 200-98, Format B002
Input Signal:
Demodulated (dc level-shifted digital signal)
Logic-High Voltage:
3.5 Vdc, minimum
Logic-Low Voltage:
0.5 Vdc, maximum
Input Voltage Range:
±20 Vdc, maximum
Resistance:
Non-linear, approximately 4 k
$
at 3.5 Vdc,
approximately 3 k
$
at 20 Vdc
Contact Inputs Recognition Time
Programmable, 4 to 255 milliseconds
Time Overcurrent Functions
Current Pickup, Phase & Neutral (51P, 51N, 151N) Dropout/pickup ratio: 95%
Pickup Accuracy:
5 Ampere CT:
±2% or ±50 mA
1 Ampere CT:
±2% or ±10 mA
Current Pickup, Negative Sequence (51Q)
Dropout/pickup ratio: 95%
Pickup Accuracy:
5 Ampere CT:
±3% or ±75 mA
1 Ampere CT:
±3% or ±15 mA
Current Input All 51 Functions
5 Ampere CT:
Range:
0.50 to 16.0 A
Increments:
0.01 from 0.50 to 9.99, 0.1 from 10.0 to 16.0
1 Ampere CT:
Range:
0.10 to 3.2 A
Increments:
0.01 A
NOTE
All timing specifications are for the worst case response. This includes output
contact operate times and standard BESTlogic operation timing, but excludes
input debounce timing and non standard logic configurations. If a non-standard
logic scheme involves feedback, then one or more BESTlogic update rate delays
must be included to calculate the worst case delay. An example of feedback is
Virtual Outputs driving Function Block Inputs. For more information, see Section
7,
BESTlogic Programmable Logic.
