Drive System Monitoring; Input Current Overload Detection; Input Current; Input Current Overload Error 36 - Precor TRM 885.v2 Service Manual

Drive System Monitoring

Parameters in the drive system must be monitored to ensure proper operation and to respond to
overload conditions. This includes the input current, input voltage, motor current and temperature.

Input Current Overload Detection

The drive system will monitor the line input current. The drive should detect the overload before the
circuit breaker.

Input current

Input current is reported in true RMS
Input current is averaged over 2500mSec rolling period.

Input current overload error 36

The error code is reported to the display when this overload is detected. The error is reported
per the communications protocol.

Instantaneous Input Current Overload Detection

The drive system will monitor the input current for fast input current incursions. The drive will detect
the overload before the circuit breaker. A hardware delay will define the error response time.

Input overload error 35

The error code is reported to the display when this overload is detected. The error is
reported per the communications protocol.

Motor Over Temperature Detection

The motor temperature is monitored with a thermal switch in the motor winding and a time current
shutdown algorithm. The thermal switch is an indicator the motor is getting hot and is used to start
the current time counter algorithm. Thermal switch is normally closed.
An open thermal switch will report error 28.
The thermal switch must be closed before the motor will start.

Motor Current Overload Detection

A motor current and time algorithm will determine the time to shutdown of the motor. This algorithm
will be adjusted to the drive's performance to maximize the time the motor can safely be operated
with high current.
Motor current overload error 27
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