Sp Di 1 - Eaton MP-3000 Instruction Leaflet

only. If the time set in TRNT P5L6 expires before the current transition,
the motor trips.
TRN T+C—Transition on time or current, whichever comes first.
TRN T/C—Transition on time and current. Both must occur, and the
current must drop below the setting before the time delay expires. If
the timer expires before the current falls below the set transition level,
the motor trips.
In addition, the MP-3000 provides a transition control signal to a
reduced-voltage starter, allowing it to raise the voltage to the running
value. To do this, the transition function activates the contact output
AUX2 (unless the function of AUX2 has been redefined by setting
changes in the AUX2 configuration settings, page 10).
NOTE: Even if the transition control output is not used, set the transi-
tion function to provide clear indications of the actual state of
the motor (START; RUN) on the front panel display and via
data communications. A good way to do this is to use the
settings of P5L7 = TRN T+C and P5L5 = 130% of FLA. Modify
the latter, if needed, to lie at a transition value between the
starting current and post-start maximum load current.
5.5.8 Setting P5L8, Incomplete Sequence Report Back Time
(INSQ)
P5L8 sets the required process report back time in seconds. This func-
tion can be set to OFF.
The incomplete sequence function requires a report back contact from
the process that the motor runs - any indication that the process has
proceeded to operate as expected some time after the motor start.
If the process does not start up correctly, the contact does not close
within the expected time. If a problem develops later on, the report
back contact opens. In either case, the open contact state indicates
that the motor should be tripped.
To use this function, set a time limit for report back here. Set P5L9
(covered in the next subsection) to define the start of report back tim-
ing. Connect the report-back contact to MP-3000 Discrete Input 2. If
this input is not energized before the set time expires, the relay will trip
for incomplete sequence.
Note that the input must be energized continuously after the time delay
has expired to hold off this trip.
Note that Discrete Input 2 setting P7L1 (see subsection 5.7.1) is
automatically assigned to the function INC SEQ if a time delay is set
here. All other alternate uses for Discrete Input 2 (setting P7L1) are
suppressed and not visible until INSQ is set to OFF.
5.5.9 Setting P5L9, Incomplete Sequence Start Timer Event
(INSQ TRN or INSQ ST)
Choose to start the incomplete sequence timer either when the motor
start is declared (INSQ ST) or when the transition from start to run is
declared (INSQ TRN).
5.5.10 Setting P5L10, Long acceleration Time (LaT)
P5L10 sets a time interval during which the motor is permitted to ac-
celerate a high-inertia load, which is longer than the locked-rotor time.
This function can be (and usually should be) set to OFF. If the thermal-
model accumulator bucket fills to 100% during the long acceleration
time, it is limited to that value and the thermal trip is held off until the
LAT delay expires. By then, the thermal bucket level must have de-
creased (thermal model cooled) below 100% or the motor trips.
MP-3000
The LAT function should be used only on motors with a zero-speed
switch (a normally-closed contact that opens when the motor actually
begins to spin). Connect the zero-speed switch contact to MP-3000
Discrete Input 1. The Zero-Speed Switch function must be enabled
(ZSW ON). Refer to setting P5L11 in the next subsection. The
MP-3000 requires the zero-speed switch to open within LRT/2 (one-
half of locked-rotor time setting P1L3) after a start, or the motor is
tripped by the ZSW function. This protects a completely stalled motor
from being damaged when the LAT timer blocks the locked-rotor
thermal trip.
ThE LONG aCCELERaTION TIME (LaT) fUNCTION CaN BLOCK
ThE CRITICaL LRC-LRT ROTOR ThERMaL PROTECTION DUR-
ING a STaRT aND DESTROy ThE MOTOR. TURN LaT Off UN-
LESS aBSOLUTELy NEEDED aND MOTOR'S SUITaBILITy fOR
ThIS STaRTING DUTy haS BEEN CONfIRMED. USE ONLy WITh
ZERO-SPEED SWITCh fUNCTION ZSW ON aND SWITCh INPUT
CONNECTED TO PROTECT a STaLLED MOTOR.
5.5.11 Setting P5L11, Zero Speed Switch On or Off (ZSW ON
or ZSW Off)
P5L11 enables the function that verifies if the motor begins to physically
spin after a start. It requires a zero-speed switch on the motor, which is
closed at rest and opens as the rotor begins to turn. Connect the zero-
speed switch contact to MP-3000 Discrete Input 1. If the contact fails to
open within LRT/2 (one-half of locked-rotor time setting P1L3) after a start,
the relay trips with a zero-speed switch trip message.
This protection is always useful, but is essential if the Long Accelera-
tion Time (LAT) function set by P5L10 is used.
Note that if the ZSW function is set to ON, Discrete Input 1 is automati-
cally configured to be the zero speed switch input. All other alternate
function settings for Discrete Input 1 (P6L1) are suppressed and not
visible until ZSW is set to OFF.
With ZSW ON, the MP-3000 checks Discrete Input 1 for voltage at the
very moment it sees a start—it wants to sense the initially closed zero-
speed switch, which opens shortly thereafter as the motor spins. If it
fails to find the closed contact, it trips immediately with a zero-speed
switch trip message. Check the wiring and contact for problems.
5.5.12 Setting P5L12, anti-Backspin Delay Time (aBK)
P5L12 sets the time in seconds before a motor restart is permitted after
a trip or stop condition. This function can be set to OFF.
This function is used with a motor driving a pump working into a head,
or any other load that tends to spin in a reverse direction (backspin)
when the motor is de-energized. It blocks starting during the time when
the motor might be rotating in reverse following a trip. Also, this func-
tion may be used simply to set idle time (time between stop and start)
before a restart is permitted
5.6 Page 6, SP DI 1
This page contains the single setting that configures Discrete Input
1 (DI 1). The input must be a 120 Vac signal. A 120 Vac source for
wetting dry contacts is provided on the MP-3000 terminal block for
convenience. Refer to the wiring diagrams in Section 6.
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