What is the function of the OIL parameter of an ATS48 series soft starter and how do I configure it?

The OIL (Current Overload Activation) parameter in an ATS48 soft starter provides an optional current-based alarm or fault function. It allows you to trigger an alarm or stop the motor when the current exceeds a user-defined threshold.

By default, OIL is set to OFF and does not need to be configured unless a custom current limit is required.

Note: The OIL function is separate from the ATS48's Thermal Overload Protection. It is intended for application-specific current monitoring rather than motor thermal protection.

Configure a Custom Current Alarm or Fault

1. Set OIL to:

   • DEF = Generates a fault and stops the motor.
   • ALA = Generates an alarm only.

2. Set LOC to the desired current threshold.

   • Adjustable from 50% to 300% of the motor's nominal current (IN).

3. Set IN (in the SET menu) to the motor's full-load current (FLC).

4. Set TOL to define how long the current can remain above the LOC threshold before the alarm or fault is triggered.

Example: Conveyor Jam Protection

A conveyor is driven by a motor rated at 100 A full-load current, but normal operation never requires more than 80 A. If current exceeds 80 A, it may indicate a jam or mechanical problem.

Configure the parameters as follows:

SET Menu

• IN = 100 A

PRO Menu

• OIL = DEF
• LOC = 80%
• TOL = 5 s

With these settings, the soft starter will trip on an OLC fault and stop the motor if the current exceeds 80 A for more than 5 seconds.

Alarm-Only Configuration

If you want a warning without stopping the motor:

• Set OIL = ALA
• Assign Relay Output R3 = AIL

In this configuration, the soft starter activates an alarm when the current threshold is exceeded, while allowing the motor to continue running.

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