Machine Protection

and Adaptive

Control

Restart Inhibit.

This function provides short cycle protection for the motor, and indirectly also short cycling protection for the starter since the starter is designed to operate the motor under all the conditions of motor performance.

The operation of the restart inhibit function is dependent upon two setpoints. The Restart Inhibit Free Starts (1-5, 3 default), and the Restart Inhibit Start to Start Timer (10-30 min, 20 default). These settings are adjustable via the service tool.

Restart Inhibit Free Starts

This setting will allow a number of rapid restarts equal to its value. If the number of free starts is set to “1”, this will allow only one start within the time period set by the Start to Start Time Setting. The next start will be allowed only after the start to start timer has expired. If the number of free starts is programmed to “3”, the control will allow three starts in rapid succession, but thereafter, it would hold off on a compressor start until the Start to Start timer expired. i.e. with 3 free starts and 20 min. restart inhibit settings, it will take 60 minutes of run time to restore the total of 3 free starts.

Restart Inhibit Start to Start Time Setting

This setting defines the shortest chiller cycle period possible after the free starts have been used. If the number of free starts is programmed to “1”, and the Start to Start Time Setting is programmed to 10 minutes, then the compressor will be allowed one start every 10 minutes. The start-to-start time is the time from when the motor was commanded to energize to when the next command to enter prestart is given.

Clear Restart Inhibit

A Clear Restart Inhibit “button” is provided within Settings; Manual Override on the DynaView display. This provides a way for an operator to allow a compressor start when there is a currently active Restart Inhibit that is prohibiting such a start. The “button” press will have no other function than to remove the restart inhibit if there is one active. It does not change the count of any internal restart inhibit timers or accumulators. command, but is inhibited, pending the expiration of the timer.

The restart inhibit function, setpoints and clear features exist for each compressor and operate independently of other compressors on that chiller.

During the time the start is inhibited due to the start-to-start timer, the DynaView shall display the mode ‘Restart Inhibit’ and the also display the time remaining in the restart inhibit.

A “Restart Inhibit Invoked” warning diagnostic will exist when the attempted restart of a compressor is inhibited.

If all three motor winding temperatures are less than the “Restart Inhibit Temperature” Setpoint (default 165°F/74°C) then restart is allowed.

Restart inhibit mode exist when at least one of the three motor winding temperatures is greater than or equal to the “Restart Inhibit Temperature” Setpoint but less than 265°F/129.4°C. Restart inhibit mode is entered until all three motor winding temperatures are less than the ‘Restart Inhibit Temperature’ Setpoint

Note: When one of the three motor winding temperatures is 265°F/ 129.4°C or greater, a High Motor Winding Temperature diagnostic shall be called.

Note: When the start is inhibited by the restart inhibit function, the time remaining will be displayed along with the restart inhibit mode.

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Trane CVHE-SVU01E-ENX39640712050 manual Restart Inhibit Free Starts, Restart Inhibit Start to Start Time Setting

CVHE-SVU01E-ENX39640712050 specifications

The Trane CVHE-SVU01E-ENX39640712050 is a high-efficiency centrifugal chiller designed for commercial and industrial applications. This state-of-the-art unit is engineered to provide reliable cooling performance, energy efficiency, and optimized operational flexibility. It is particularly suitable for large-scale facilities that require significant cooling capacity and robust performance under varying load conditions.

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