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I.L. 17562
Page 93
PR 0.3 Effective 8/99
operation above UTC. Make sure the winding direct thermal trip temperature setting (WD T) is
not turned OFF, or the algorithm reverts to strict use of UTC.
9.1.3.4 Underload Functions —
When the motor is running, a current reduction might indicate
a malfunction in the load. Underload protection recognizes mechanical problems, such as a
blocked flow or loss of back pressure in a pump, or a broken drive belt or drive shaft.
Refer to the underload protection limit - the left vertical line - in the Underload–Jam Protection
Curve example of Figure 9.3. Here, the underload trip is set at 60% of FLA. The MP-3000 has
setpoints for underload alarm (ULA, P4L5), and underload trip (ULT, P3L9). Each can be
disabled by setting to OFF. These would be represented by two such vertical lines, both below
the normal load current. Be sure to set the alarm level above the trip level. Both trips and
alarms are held off by start delay ULSD, P3L10. Each has its own run or pickup delay - ULTR,
P3L11 and ULAR, P4L4. Use the start delay to block tripping until the load stabilizes after a
start; and use run delays to avoid nuisance alarms or trips for load transients.
9.1.3.5 Jam Functions —
When the motor is running, a current increase way above normal load
might indicate a malfunction in the load. Jam protection recognizes mechanical problems, such
as broken drive gears.
Refer to the jam protection limit - the right vertical line - in the Underload–Jam protection curve
example of Figure 9.3. Here, the jam trip is set at 150% of FLA. The MP-3000 has setpoints for
jam alarm (JMA, P4L3), and jam trip (JMT, P3L6). Each can be disabled by setting to OFF.
These would be represented by two such vertical lines, both well above the normal load current.
Be sure to set the alarm level below the trip level. Both trips and alarms are held off by start
delay JMSD, P3L7. Each has its own run delay - JMTR, P3L8 and JMAR, P4L4. Use the start
delay to block tripping until the motor current drops to continuous load level; and use run delays
to avoid nuisance alarms or trips for load transients.
9.1.4 Complete Motor Protection Curves —
To illustrate the protection features of the
MP-3000, two sample curves are shown. Using specific motor data, typical motor protection
curves for the MP-3000 without RTDs are shown in Figure 9.4. The use of RTDs is assumed in
Figure 9.5. The following data were used:
•
Balanced currents during start and run cycles.
•
Instantaneous overcurrent limit IOC of 12 times FLA
•
Locked-rotor amperes of 6.1 times FLA
•
Maximum allowable stall or locked-rotor time of 15 seconds, cold start
•
Ultimate trip level of 100 percent of FLA (service factor = 1.0)
•
Motor running; normally loaded at 90 percent of FLA
•
Underload protection at 60 percent of FLA with a 5-second run delay
•
Jam protection at 180 percent of FLA with a 5-second run delay
The MP-3000 recognition of the transition from start to run has no impact on this protection
curve, but defines when the displays and indications change from START to RUN. For a
reduced-voltage starter, the transition function also defines when the AUX2 output relay switches
the starter from reduced to normal running voltage. See 9.2.1 below. The user might elect to
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...