YORK YMC2 — VSD - INVERTER PROGRAM FAULT

The panel shows VSD - INVERTER PROGRAM FAULT in this exact wording; the manuals print no other variant of the message. It belongs to the YMC2's safety shutdown messages, so the unit trips when it becomes active.

The manuals give this shutdown two meanings. The first is an inverter internal code exception: when the inverter hits something like a divide-by-zero or an out-of-range parameter, the unit trips. The HYP logic board then indicates the inverter program fault and passes the error information — including the module number and the line number — over the communications link. The second meaning is a failed validation of the inverter software against the motor design: the VSD software contains a verification process that confirms the correct set of software is installed in the VSD logic board for the application, and the shutdown occurs when that verification does not pass. The drive is used on two different motor designs, which is why the software must be validated for the one actually fitted.

• An internal code exception inside the inverter, such as a divide-by-zero or an out-of-range parameter.
• The inverter software does not match the motor design of the application: the three pieces of data that must state that the correct inverter software is installed in the VSDF logic board do not agree.

1. Take the error information the HYP logic board reports over the communications link; it includes the module number and the line number of the code exception.
2. Confirm the three pieces of data that must state that the correct inverter software is installed in the VSDF logic board.
3. Check that the software in the VSD logic board U38 matches the condition on J2 pin 14.
4. Check that the software in the VSD logic board U38 also matches the programmed motor selection from the chiller control center; all three must agree for this shutdown not to occur.

The chiller stays shut down until the condition clears. When it does, the chiller can be started after the CLEAR FAULTS button is pressed. The manuals repeat this action for both meanings of the message, and it is the only reset step they describe.