Eaton MP-3000, Manual

Page: 111 / 123

I.L. 17562
Page 111
PR 0.3 Effective 8/99
Section 11. TESTING
11.0 General — The MP-3000 requires no maintenance. Do not remove the rear cover. In most
applications, normal cycles of use will demonstrate that the relay is functioning properly. Use the
following procedures for bench checkout, or for verification of inputs and outputs that haven't
been observed to function for one year or more. Users with normally trouble free applications
should check the alarm relay, and the annunciator to which it is connected, at least annually.
11.1 What to test - The MP-3000 microprocessor routinely checks most of its own electronics,
plus program memory and the writeable, nonvolatile data storage memory. If it detects
malfunctions, it reports specific messages, and has setpoints to alarm the user and/or trip the
motor as desired. See Setpoint P12L16 in Table 4.3 and Section 5.12.16.
It is neither necessary nor beneficial to test individual functions of a multifunction microprocessor
relay for maintenance purposes. All functions are performed by the same microprocessor
electronics. It is important only to make sure the setpoints are correct (use View SP mode any
time), and to confirm that the inputs and outputs are working with the application wiring.
To test the MP-3000 inputs and outputs, use the SP TEST page in the Program mode. Refer to
Sections 5.0 and 5.13 and to Table 4.3 for details on using the Program mode to activate testing
setpoints P13L1 to P13L8.
11.2 Tests on a running motor - In order to use any of the test setpoints on a running motor,
the relay must be set to allow programming while running. See STOP PGM versus RUN PGM in
Section 5.12.6 and Setpoint P12L6.
To test the trip output relay, the motor must be stopped in any case. An attempt to test this while
the motor runs will bring an ILLEGAL message.
All other inputs and outputs can be tested while the motor runs.
DANGER
Using the test setpoints will change the state of outputs, regardless of the functions normally
operating those outputs. Unless testing is urgent, wait until the motor is stopped to run tests. If
the motor is running, make sure that changing the output state will not create a dangerous
situation in the motor, starter, or process.
11.3 Verifying current inputs - If the motor current readings were checked at the time of
commissioning as described in Section 7, it is often adequate just to periodically observe the
motor load current readings during normal motor operation. Use the phase current values on the
MONT I page of the Monitor mode, or check values by remote communications. A clip-on
ammeter can also be used, but allow tolerance for errors in the clip-on ct and in the main cts of
the motor starter.
11.4 - Bench test of current inputs - Use a 3-phase source or relay test set to simulate motor
load current; check correctness of readings considering the scaling of the PCT and GCT Ct ratio
setpoints P1L5 and P1L6.
If a 3-phase source is not available, use the single-phase test mode of the MP-3000. Set
P13L1 to 1 PHASE. A single current around 3.5 to 4 A can be applied to all four ct inputs, daisy-
chained in series; observe the metered values considering PCT and GCT.