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I.L. 17562
Page 49
PR 0.3 Effective 8/99
300 × 5/400 = 3.75 amperes, an ideal value.
For a 1 ampere Ct set:
For optimum metering accuracy at low loads, the Ct should deliver between 0.7 and 0.8 amperes
at 100 percent FLA. Attempt to achieve 0.75 A.
For reliable motor protection, the Ct should deliver between 0.5 and 0.8 amperes at
100 percent FLA.
For example, if the motor has an FLA of 300A, a 400:1 Ct will supply:
300 × 1/400 = 0.75 amperes, an ideal value.
Note that
PCT
/
FLA
must lie between 0.5 and 1.5 for successful programming - you will not be
able to exit Program Mode until one or the other value is adjusted. The following are the display
messages which appear when exit is blocked:
Display
Complete Help Message
FLA CT L
THE RATIO OF FLA TO CT RATIO IS BELOW .5 -
INCREASE FLA OR DECREASE CT RATIO - PRESS
PROGRAM TO CONTINUE
FLA CT H
THE RATIO OF FLA TO CT RATIO IS ABOVE 1.5 -
DECREASE FLA OR INCREASE CT RATIO - PRESS
PROGRAM TO CONTINUE
IOC OUT
IOC SETPOINT IS OUT OF RANGE - DECREASE IOC OR
DECREASE FLA OR INCREASE CT RATIO - PRESS
PROGRAM TO CONTINUE'
JAMT OUT
JAM TRIP SETPOINT IS OUT OF RANGE - DECREASE JAM
TRIP OR DECREASE FLA OR INCREASE CT RATIO -
PRESS PROGRAM TO CONTINUE
JAMA OUT
JAM ALARM SETPOINT IS OUT OF RANGE - DECREASE
JAM ALARM OR DECREASE FLA OR INCREASE CT RATIO
- PRESS PROGRAM TO CONTINUE
FLA is a fixed property of the motor. Select a Ct whose ratio is suitable for this motor.
CAUTION
Be careful when determining Ct turns ratio. An improper value can cause the MP-3000 to
receive incorrect motor current data. Motor damage could result.
5.1.6 Setpoint P1L6, Ground Fault Ct Ratio (GCT) —
Specifies the numerator of the turns
ratio of the single ground current transformer used only for ground fault protection and ground
current metering. Obtain from the Ct nameplate or from the installation drawings, watching for
the use of taps on cts which have tapped windings.
Typically, the three phase power conductors pass through the single window of a ground fault Ct,
whose ratio is usually much lower than that of the phase Cts for good ground fault sensitivity. A
very common type of ground fault Ct has a ratio of 50:5 or 50:1, but check the Ct in use.
Содержание 66D2032G01
Страница 18: ...Page 18 I L 17562 PR 0 3 Effective 8 99 Figure 4 1 MP 3000 Pushbuttons...
Страница 19: ...I L 17562 Page 19 PR 0 3 Effective 8 99 Figure 4 2 MP 3000 LED Indicators...
Страница 72: ...Page 72 I L 17562 PR 0 3 Effective 8 99 Figure 6 1 Panel Cutout Dimensions...
Страница 73: ...I L 17562 Page 73 PR 0 3 Effective 8 99 Figure 6 2 Faceplate Dimensions...
Страница 74: ...Page 74 I L 17562 PR 0 3 Effective 8 99 Figure 6 3 MP 3000 Case Depth Dimensions...
Страница 75: ...I L 17562 Page 75 PR 0 3 Effective 8 99 Figure 6 4 Universal RTD Module Mounting Dimensions...
Страница 76: ...Page 76 I L 17562 PR 0 3 Effective 8 99 Figure 6 5 Rear Panel Terminals...
Страница 77: ...I L 17562 Page 77 PR 0 3 Effective 8 99 Figure 6 6 Typical Ct Circuits and Motor Control Wiring...
Страница 78: ...Page 78 I L 17562 PR 0 3 Effective 8 99 Figure 6 7 Typical ac Supply and URTD Wiring...
Страница 79: ...I L 17562 Page 79 PR 0 3 Effective 8 99 Figure 6 8 Alternatives for Discrete Input Wiring...
Страница 80: ...Page 80 I L 17562 PR 0 3 Effective 8 99 Figure 6 9 RTD Wiring to URTD Module...
Страница 88: ...Page 88 I L 17562 PR 0 3 Effective 8 99 Figure 8 1 System Overview Figure 8 2 Torques from Sequence Currents...
Страница 100: ...Page 100 I L 17562 PR 0 3 Effective 8 99 Figure 9 1 Rotor Temperature Tracking...
Страница 101: ...I L 17562 Page 101 PR 0 3 Effective 8 99 Figure 9 2 Motor Protection Curve...
Страница 102: ...Page 102 I L 17562 PR 0 3 Effective 8 99 Figure 9 3 Underload Jam Protection Curve...
Страница 103: ...I L 17562 Page 103 PR 0 3 Effective 8 99 Figure 9 4 Motor Protection Curve Example without RTDs...
Страница 104: ...Page 104 I L 17562 PR 0 3 Effective 8 99 Figure 9 5 Motor Protection Curve Example with RTDs...
Страница 105: ...I L 17562 Page 105 PR 0 3 Effective 8 99 Figure 9 6 Motor Start and Run Cycles...
Страница 109: ...I L 17562 Page 109 PR 0 3 Effective 8 99 P5L8 40 Incomplete Sequence time 1 60s OFF 1 240s...