User-Programmable Leds - GE L90 Instruction Manual

5.2 PRODUCT SETUP
The 90% thermal response time characteristic of 15 minutes is illustrated below. A setpoint establishes the time to reach
90% of a steady-state value, just as the response time of an analog instrument. A steady state value applied for twice the
response time will indicate 99% of the value.
CALCULATION METHOD 2: BLOCK INTERVAL
This method calculates a linear average of the quantity (RMS current, real power, reactive power, or apparent power) over
the programmed demand time interval, starting daily at 00:00:00 (i.e. 12:00 am). The 1440 minutes per day is divided into
the number of blocks as set by the programmed time interval. Each new value of demand becomes available at the end of
each time interval.
CALCULATION METHOD 2a: BLOCK INTERVAL (with Start Demand Interval Logic Trigger)
This method calculates a linear average of the quantity (RMS current, real power, reactive power, or apparent power) over
the interval between successive Start Demand Interval logic input pulses. Each new value of demand becomes available at
the end of each pulse. Assign a FlexLogic™ operand to the
5
demand interval pulses.
If no trigger is assigned in the
culating method #2. If a trigger is assigned, the maximum allowed time between 2 trigger signals is 60 minutes. If
no trigger signal appears within 60 minutes, demand calculations are performed and available and the algorithm
NOTE
resets and starts the new cycle of calculations. The minimum required time for trigger contact closure is 20 s.
CALCULATION METHOD 3: ROLLING DEMAND
This method calculates a linear average of the quantity (RMS current, real power, reactive power, or apparent power) over
the programmed demand time interval, in the same way as Block Interval. The value is updated every minute and indicates
the demand over the time interval just preceding the time of update.
a) MAIN MENU
PATH: SETTINGS PRODUCT SETUP
USER-PROGRAMMABLE
LEDS
5-46
Figure 5–3: THERMAL DEMAND CHARACTERISTIC
DEMAND TRIGGER

USER-PROGRAMMABLE LEDS

LED TEST
TRIP & ALARM LEDS
MESSAGE
USER-PROGRAMMABLE
MESSAGE
LED1
USER-PROGRAMMABLE
MESSAGE
LED2
USER-PROGRAMMABLE
MESSAGE
LED48
L90 Line Current Differential System
Time (minutes)
setting to program the input for the new
DEMAND TRIGGER
setting and the
CRNT DEMAND METHOD
5.2.11 USER-PROGRAMMABLE LEDS
See below
See page 5–49.
See page 5–49.
5 SETTINGS
842787A1.CDR
is "Block Interval", use cal-
GE Multilin