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MP-4000 IB02602002E
SECTION 5 - PROGRAMMING THE MP-4000
5.0 General
You can change MP-4000 settings in the Program mode. Before
changing settings, read this entire section as well as Section 9 - Ap-
plication and Settings, for a full understanding of the settings and the
relay functions they control. This section summarizes the functions
of all of the settings. Section 9 provides more detailed engineering
explanation for selected settings that require it.
Open the front panel security door and press the Prog(ram) pushbut-
ton to place the MP-4000 into the Program mode (see Figure 4.1).
Table 4.3 can be used as both a guide and a worksheet for program-
ming. The Page and Line pushbuttons permit the User to navigate
through the Program mode. The Value pushbuttons allow the setting
values to be changed.
An MP-4000, which is protecting a running motor, can only be re-
programmed after pressing the Prog pushbutton, pressing the Page
pushbutton 12 times, and pressing the Line pushbutton 6 times. Refer
to Subsection 5.12.6.
The MP-4000 continues to protect the motor with its prior settings as
the values are manipulated in the Program mode. Changes to the set-
tings do not take effect until the Prog button is pressed a second time
to exit the Program mode.
Make sure the motor is in a stable state before programming. If the
operating state of the motor changes during a programming operation,
the MP-4000 exits the program mode without actually making any of
the changes entered to that time. State changes include any transition
to start, run, stop, alarm, or trip.
In the following sections, the notation PnLm designates the setting on
page n, line m.
Note that if the unit is powered down for more than 30 days the real-
time clock may need to be reset and the histories may need cleared.
5.0.1 Conditional Setting Ranges
Program settings have individual ranges and setting increments,
or selections, listed in Table 4.3. However, note that seven of the
settings have linked ranges. Because of this, it may be possible to
set unacceptable combinations of values during the programming
operation. If this error is made, pressing the Prog pushbutton does
not cause the MP-4000 to exit the programming mode. Instead, the
display indicates which setting is out of range, and the Help message
indicates the x. Also, see individual descriptions for each of these
linked settings:
The ratio of Motor Full Load Amperes nameplate value
(FLA; P1L1) to Phase CT-ratio numerator (PCT, P1L5) must
be between 0.25 and 1.5. Both of these values are dictated
by the design of the protected motor. The error can be cor-
rected only by installing an appropriate current transformer
set for the motor. See FLA CT L and FLA CT H in Table
5-1; also refer to Subsection 5.1.5 for guidance on CT ratio
selection.
The instantaneous overcurrent trip setting (IOC, P3L4) must
be below (1,130 * PCT/ FLA)% or 1,600%, whichever is
less. See IOC OUT in Table 5-1.
The jam trip and alarm current levels (JMT, P3L6 and JMA,
P4L3) must be below (1,130 * PCT/ FLA)% or 1,200%,
whichever is less. See JAMT OUT and JAMA OUT in
Table 5-1.
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The underload trip (ULT, P3L9) and alarm (ULA, P4L5)
levels must be greater than the programmed Stop Current
Threshold (STOP XX, P1L9). Remember that underload trip
and alarm functions are programmed as a percentage of the
FLA, while the Stop Current Threshold is programmed as a
percentage of the PCT. For comparison, multiply the Stop
Current Threshold by PCT/FLA.
A motor start is declared when the current is initially seen
with a magnitude greater than 30% of FLA (see Subsection
9.2.1). Make sure that the Stop Current Threshold is less
than this value. Remember the Stop Current Threshold is
programmed as a percentage of the PCT. For comparison,
multiply the Stop Current Threshold by PCT/FLA. This num-
ber must be less than 30%.
The Motor Start Transition Current Level (TRNC, P5L5)
must be greater than the programmed Stop Current
Threshold. Remember that the TRNC is programmed as
a percentage of FLA, while the Stop Current Threshold is
programmed as a percentage of the PCT. For comparison,
multiply the Stop Current Threshold by PCT/FLA.
CAUTION
FLA IS A FIXED PROPERTY OF THE MOTOR. SELECT A CT
WHOSE RATIO IS SUITABLE FOR THIS MOTOR.
5.0.2 Viewing Settings
Most of the following settings can be viewed without accessing the
Prog button. To view the settings, use the View Setting display mode
button.
Note that certain settings without logical display values are not visible
in the View Setting mode. These are on setting pages 12, 13, and 14,
and are indicated by dashes in the Factory Default column of
Table 4.3. They include testing settings and time values. Check the
setting of the calendar/clock using the Monitor Tim(e) page of the
Monitor Mode.
5.1 Page 1, SP MOTOR, Settings P1L1 to P1L8
These settings, which are motor constants, are usually obtained from
the motor nameplate or manufacturer-supplied data. They must be
correct for the MP-4000 to adequately protect the motor.
5.1.1 Setting P1L1, Full-Load Amperes (FLA)
FLA is set to the maximum stator continuous RMS current in the
primary (actual motor winding) amperes in each phase. The motor
nameplate or manufacturer’s data provides the value of this setting.
NOTE: Do not vary the FLA setting from motor nameplate value, even
if the motor has a service factor different from 1.0. See UTC,
P1L4 for the consideration of the service factor.
CAUTION
MANY OF THE PROTECTION FUNCTIONS OF THE MP-4000,
INCLUDING THE MOTOR THERMAL PROTECTION ALGORITHM,
USE THE FLA SETTING VALUE TO CALCULATE TRIP POINTS. IF
THE USER ENTERS AN INCORRECT SETTING, MANY PROTEC-
TION FUNCTIONS MAY NOT OPERATE AS DESIGNED AND THE
MOTOR MAY BE DAMAGED.
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