Eaton MP-3000 Instruction Leaflet page 34

IM02602002E
Display
THE RATIO OF FLA TO CT RATIO IS BELOW 0.25 - INCREASE FLA OR DECREASE CT RATIO - PRESS PROGRAM
FLA CT L
TO CONTINUE
THE RATIO OF FLA TO CT RATIO IS ABOVE 1.5 - DECREASE FLA OR INCREASE CT RATIO - PRESS PROGRAM
FLA CT H
TO CONTINUE
IOC SETTING IS OUT OF RANGE - DECREASE IOC OR DECREASE FLA OR INCREASE CT RATIO - PRESS PRO-
IOC OUT
GRAM TO CONTINUE
AM TRIP SETTING IS OUT OF RANGE - DECREASE JAM TRIP OR DECREASE FLA OR INCREASE CT RATIO
JAMT OUT
- PRESS PROGRAM TO CONTINUE
JAM ALARM SETTING IS OUT OF RANGE - DECREASE JAM ALARM OR DECREASE FLA OR INCREASE CT
MA OUT
RATIO - PRESS PROGRAM TO CONTINUE
UNDERLOAD TRIP SETTING IS LESS THAN STOP CURRENT LEVEL - DECREASE STOP CURRENT LEVEL OR
ULT LOW
INCREASE UNDERLOAD TRIP LEVEL - PRESS PROGRAM TO CONTINUE
UNDERLOAD ALARM SETTING IS LESS THAN STOP CURRENT LEVEL - DECREASE STOP CURRENT LEVEL OR
ULA LOW
INCREASE UNDERLOAD ALARM LEVEL - PRESS PROGRAM TO CONTINUE
STOP CURRENT LEVEL IS ABOVE THE START LEVEL - DECREASE STOP CURRENT LEVEL - PRESS PROGRAM
STP HIGH
TO CONTINUE
STOP CURRENT LEVEL IS ABOVE THE TRANSITION LEVEL - DECREASE STOP CURRENT LEVEL OR
TRNS LOW
INCREASE TRANSITION LEVEL - PRESS PROGRAM TO CONTINUE
5.1.2 Setting P1L2, Locked-Rotor Current (LRC)
LRC is set to the locked-rotor current, which is the current the motor
draws when stalled, in percentage of fLa (see P1L1). Use the motor
nameplate or manufacturer's data.
5.1.3 Setting P1L3, Maximum allowable Stall or Locked-Rotor
Time (LRT)
LRT specifies how long a locked-rotor or stall condition can be main-
tained before the motor is damaged, in seconds, for a cold start. Use
motor nameplate or manufacturer's data.
LRC and LRT combine to specify a point on the motor damage curve
(Figure 9.4) which, when reached during a start, causes a locked-rotor
trip. Refer to Subsection 9.1.3 for a detailed explanation.
CaUTION
INCORRECT SETTING VaLUES fOR ThESE fUNCTIONS CaN
RESULT IN EXCESSIVE ROTOR TEMPERaTURES aND MOTOR
DaMaGE.
5.1.4 Setting P1L4, Ultimate Trip Current (UTC)
UTC sets the current level above which a trip eventually occurs when
no RTD stator temperature data is available, in percentage of FLA.
This value represents the limit line on the running (upper) portion of
the non-RTD motor damage curve shown in Figure 9.4.
NOTE: This UTC setting is where the User considers the service factor
rating of the motor. Never adjust the fLa setting P1L1 accord-
ing to the service factor (see Subsection 9.1.3.3).
For normal use, set UTC to the service factor times 100%. The avail-
able range is 85% to 150%. The service factor is found on the motor
nameplate or in manufacturer's data.
Note that the relay does not trip at the moment the current goes above
UTC during motor running. Instead, it models the gradual stator
heating for currents above UTC, and trips only after some time has
Page 5-2
MP-3000
Table 5.1 Inconsistent Settings Messages.
Complete Help Messages
passed. The trip time depends on a variety of setting and operating
factors, including motor nameplate data contained in other setting values.
Use a conservative, or lower, value of UTC than that dictated by the
service factor if motor ambient temperatures rise above 40ºC (104ºF)
and the optional URTD Module is not used (see Subsection 9.1.1).
Also, consider lowering the UTC value if the motor is suitably rated,
yet additional safety is critical for the application.
If UTC IS SET aBOVE 100 % TIMES ThE SERVICE faCTOR, MO-
TOR DaMaGE COULD RESULT.
5.1.5 Setting P1L5, Phase Current Transformer Ratio (PCT)
PCT specifies the numerator of the turns ratio of the main phase current
transformers. Obtain the value from the current transformer (CT) name-
plate or from the installation drawings. PCT is not the CT rating, but
the actual turns ratio, which may depend on a CT ratio tap.
Explanation of CT Ratio Presentation
The MP-3000 motor relay is available in multiple styles designed
for use with current transformers (CTs) having a nominal or rated
secondary current of either 5 amperes or 1 ampere. Check the relay
labeling or the catalog number and the CT secondary rating to confirm
a match.
All displayed information is the same for either of the two types of MP-
3000 relays. When CT ratios are to be set, the value entered is the
numerator of the main CT ratio. The denominator is assumed to be
either 5 or 1 depending on the style of MP-3000 used.
For example, a set of three 400:5 phase CTs might be used with an
MP-3000 specified for 5 A CTs. The phase CT ratio is then set to 400.
Alternatively, a set of three 400:1 CTs could be used with an MP-3000
rated for 1 A CTs. Use a setting of 400 in this case as well.
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CaUTION