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I.L. 17562
Page 9
PR 0.3 Effective 8/99
2.2 Motor Starting and Control Functions
The MP-3000 Motor Protection relay includes logic to control the number of starts that can occur
on the motor in a given time period for cold and hot motor conditions. Settable timers are
provided to control the time between starts and to restart a motor after a stop. Additional logic is
included for transition control of reduced-voltage starters.
2.2.1 Start Control Timers
Motors typically have limits to the number of cold starts, starts per time period and time between
starts that are permitted without damage. The MP-3000 incorporates these checks to prevent
excessive starting the motor.
2.2.2 Reduced Voltage Starting
The MP-3000 provides a transition and incomplete sequence detection function for reduced
voltage starting. The user can select to transition based on four logical combinations of starting
current and time sequence. The incomplete sequence function can be used independently for
feedback indication from the process, to trip the motor if expected action doesn't occur.
2.2.3 Antibackspin Timing
For certain applications, such as pumping a fluid up a pipe, the motor may be driven backward
for a period of time after it stops. The MP-3000 provides an antibackspin timer (minimum time
between stop and restart) to prevent starting the motor while it is spinning in the reverse
direction. The relay displays the timer countdown from the moment a stop is declared by the
relay.
2.2.4 Load Shedding
The MP-3000 provides a mechanical load shedding feature that can be used to control the
driven process. The load shedding function closes a contact on an overload condition to stop
addition of load until the overload condition subsides by a set amount. Then the load shedding
contact opens and the load is restored.
2.2.5 Emergency Override
The MP-3000 has a user programmable feature that lets the operator reset certain trip conditions
including the jogging timers and thermal-model overload bucket. This function is for use in
emergency conditions only and may result in motor damage or failure. The override action is
logged with time-tag. The button is located behind a security door. The function can be
disabled.
2.2.6 Long Acceleration Motors
Large motors with high inertia loads, such as centrifuges and large fans, may experience starting
currents that greatly exceed the full load current for greater than the locked rotor time. The MP-
3000 has a timing feature which holds off thermal tripping during the long acceleration. Use this
with a zero-speed switch input.
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...