Preventive Maintenance

Overview

The following protective measures should be performed between major system checks, to help maintain your system and protect it against irrecoverable hardware or software trips:

• Continuously review operating statistics,

• Save LTMR controller parameter configuration settings to a backup file,

• Maintain the LTMR controller’s operating environment,

• Periodically perform a LTMR controller self test,

• Check the LTMR controller internal clock to ensure accuracy.

Statistics

The LTMR controller collects the following types of information:

• Real-time voltage, current, power, temperature, I/O and trip data.

• A count of the number of trips, by trip type, that occurred since last power-up.

• A time-stamped history of the state of the LTMR controller (displaying measures of voltage, current, power, and temperature) at the moment that each of the previous 5 trips occurred.

Use either SoMove with the TeSys T DTM, a Magelis XBTN410 HMI, or a TeSys T LTMCU Control Operator Unit to access and review these statistics. Analyze this information to determine whether the actual record of operations indicates a problem.

Configuration Settings

In the event of irrecoverable LTMR controller trip, you can quickly restore configuration settings if you saved these settings to a file. When the LTMR controller is first configured, and every subsequent time any configuration settings are changed, use SoMove with the TeSys T DTM to save the parameter settings to a file.

To save a configuration file:

• Select File > Save As....

To restore the saved configuration file:

1. Open the saved file: Select File > Open (then navigate to the file).

2. Download the configuration to the new controller.

3. Select Communication > Store to Device.

Environment

Like any other electronic device, the LTMR controller is affected by its physical environment. Provide a friendly environment by taking common-sense preventive measures, including:

• Scheduling periodic examinations of battery packs, fuses, power strips, batteries, surge suppressors, and power supplies.

• Keeping the LTMR controller, the panel, and all devices clean. An unobstructed flow of air will prevent dust build-up, which can lead to a short-circuit condition.

• Remaining alert to the possibility of other equipment producing electromagnetic radiation. Be sure no other devices cause electromagnetic interference with the LTMR controller.

Self Test with Motor Off

Perform a self test by either:

• Holding down the Test/Reset button on the face of the LTMR controller for more than three seconds and up to 15 seconds

• Menus command through the LTMCU display

• Setting the Self Test Command parameter (Register 704.5).

To indicate that the self test is in progress, all status LEDs (HMI, Power, Alarm, Fallback, PLC) are turned on and the output relays are opened.

A self test can be performed only if:

• No trips exist,

• The Self Test Enable parameter is set (factory setting).

The LTMR controller performs the following checks during a self test:

• Watchdog check

• RAM check

• Thermal memory time constant check

• LTME expansion module test (if it is connected to an expansion module)

• Internal communication test

• LED test: turns all LEDs off, then turns each LED on in sequence:

  • HMI communication activity LED

  • Power LED

  • Fallback LED

  • PLC communication activity LED

• Output relay test: opens all relays

If any of the tests do not pass, the LTMR signals a minor internal trip.

If current is measured during any part of the self test, the LTMR controller immediately activates a Self Test Trip.

At the end of the test, if no errors are detected, all LEDs remain ON and the output relays remain open until the reset button is activated or the power is cycled.

During the LTMR self test, a "self test" string displays on the HMI device.

Self Test with Motor On

Perform a self test by either:

• Holding down the Test/Reset button on the face of the LTMR controller for more than three seconds and up to 15 seconds

• Menus command through the LTMCU display

• Setting the Self Test Command parameter (Register 704.5).

When the motor is On, performing a self test simulates a thermal trip, in order to check if the logic output O.4 is working correctly. It triggers a Thermal Overload trip.

During a self test, the LTMR controller sets the Self Test Command parameter to 1. When the self test finishes, this parameter is reset to 0.

Internal Clock

To ensure an accurate record of trips, be sure to maintain the LTMR controller’s internal clock. The LTMR controller time stamps all trips, using the value stored in the Date And Time Setting parameter.

Internal clock accuracy is +/-1 second per hour. If power is continuously applied for one year, the internal clock accuracy is +/-30 minutes per year.

If power is turned Off for 30 minutes or less, the LTMR controller retains its internal clock settings, with accuracy of +/- 2 minutes.

If power is turned Off for more than 30 minutes, the LTMR controller resets its internal clock to the time when power was turned Off.