Programming The Mp-3000 - Eaton Cutler-Hammer MP-3000 Manual

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SECTION 5. PROGRAMMING THE MP-3000
5.0 General
The Program mode is used to change MP-3000 setpoints.
The user should read this section and also Section 9. Application and Settings, for a full
understanding of the setpoints and the relay functions they control. This Section summarizes the
functions of all of the setpoints. Section 9 provides more detailed engineering explanation for
selected settings that require it.
Open the security door and press the Prog button to put the relay into Program mode (Figure
4.1). Use Table 4.3 as a guide and as a worksheet for programming. Use the Page and Line
pushbuttons to navigate through the Program mode, and the Value pushbuttons to change the
setpoint values.
A relay protecting a running motor can be reprogrammed only if the setting number 6 (RUN PGM
or STOP PGM) on the SP SYSTEM Page (Page 12 of the setpoints) was previously set to RUN
PGM. See Section 5.12.6 below.
The relay continues to protect the motor with its prior settings as you manipulate the values in
Program mode. Changes to the setpoints will not take effect until the program 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-3000 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, the notation PnLm designates the setpoint on page n, line m.
5.0.1 Conditional Setting Ranges
Program settings have individual ranges and setting increments, or selections, listed in Table
4.3. However, note that four 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, the user will not be able to exit the programming mode by pushing Prog. Instead,
the display indicates which setting is out of range and the Help message indicates the fix. 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 0.5 and 1.5. These values are both dictated by the
design of the protected equipment, and the error can be corrected only by installing an
appropriate current transformer set for this motor. See Section 5.1.5 below for guidance on
Ct ratio selection.
• The instantaneous overcurrent trip setting (IOC, P3L4) must be below (1020 * PCT/ FLA) or
1600%, whichever is less.
• The jam trip and alarm current levels (JMT, P3L6 and JMA, P4L3) must be below (1020 *
PCT/ FLA) or 1200%, whichever is less.
5.0.2 Viewing Setpoints
I.L. 17562
PR 0.3 Effective 8/99