Three-phase equation:
PULSE/SECOND = E x I x 1.73 X _____1____________
1000 x 3600 KWH/pulse x PT Ratio (If used)
Single-phase equation:
PULSE/SECOND =
E x I
X _______1 ___________
1000 x 3600 KWH/pulse x PT Ratio (If used)
Where,
PULSE/SECOND = Number of pulses per second the PowerTrak will produce at a given KWH/pulse setting and KW
demand maximum value. If greater than five pulses per second select a larger value KWH per pulse setting with DIP
switches B1-B2 (See Table 3).
E = 144 (SYSTEM VOLTAGE SELECT switch set to 120 - 144 V)
= 277 (SYSTEM VOLTAGE SELECT switch set to 190 - 277 V)
= 415 (SYSTEM VOLTAGE SELECT switch set to 346 - 415 V)
= 480 (SYSTEM VOLTAGE SELECT switch set to 440 - 480 V)
= 600 (SYSTEM VOLTAGE SELECT switch set to 600 V)
= Primary value of potential transformer (For systems greater than 600 volts)
I = Primary value of the CT ratio selected with DIP switch C1-C5. ( ex. I = 500 for 500:5 ratio)
KWH/pulse = KWH per pulse setting from DIP switches B1-B2 (See Table 3).
PT Ratio=PT Primary/PT Secondary. Example: 4800V to 120V PT Ratio=4800/120=40
Low Voltage Alarm Contact (SYS VOLTS OK)
The Low Voltage Alarm Contact is a normally open contact that closes when any phase voltage drops below the low
voltage alarm setting determined by DIP switches A3-A8 (See Table 2). Voltage is measured line-to-line on delta
systems and line to neutral on wye systems and single-phase. There is an approximate 2-4 second time delay to
prevent nuisance trips of the alarm contact. The “SYS VOLTS OK” LED is “ON” when all phase voltages are above
the low voltage alarm setting. The LED is “OFF” when any phase voltage drops below the low voltage alarm setting.
Contact Open = All phase voltages above low-voltage alarm setting.
Contact Closed = All phase voltages below the low-voltage alarm setting.
KELE • www.kele.com • FAX 901-372-2531
USA 901-937-4900 • International 901-382-6084
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EQUATIONS - continued
AREA FOR CALCULATION AND NOTES
