On the display
The control center shows MBC - VW13 VIBRATION. Both manuals print the message in this single wording, with no variants. It belongs to the cycling shutdown messages group and concerns the impeller-end radial magnetic bearing while the unit is in Rotation mode.
What it means
The MBC has measured synchronous speed (first harmonic) shaft vibration at the impeller-end radial magnetic bearing above its limit. One manual gives the limit as greater than 60 µm from 0 to the peak amplitude; the other gives greater than 45 micron peak amplitude. The condition is monitored only when the AVR and ABS filter is on, which occurs for speed above 80 Hz in the first manual and above 70 Hz in the second — below those speeds the message cannot appear.
Why it appears
- Synchronous (first harmonic) shaft vibration at the impeller-end radial magnetic bearing exceeding the trip limit while the unit is in Rotation mode.
- Detection is only possible when the AVR and ABS filter is on, i.e. at speed above 80 Hz (one manual) or above 70 Hz (the other).
Setpoints and thresholds
- Trip limit per one manual: greater than 60 µm from 0 to the peak amplitude, monitored for speed above 80 Hz.
- Trip limit per the other manual: greater than 45 micron peak amplitude, monitored for speed above 70 Hz.
- Release threshold: the same values in reverse — the message is released when vibration is less than 60 µm, or less than 45 micron.
Reset and restart
No manual reset is described. The message releases itself once vibration falls below the limit. While it is active, the MBC ESD Fault contacts open (one manual) or the MBC Fault contacts open (the other), and the MBC remains in Levitation mode with the motor shaft levitated. One manual adds that it stays levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes
; the other mentions only the de-levitate command over serial comms.
Questions engineers ask
What does MBC - VW13 VIBRATION mean on a YORK YMC2?
It is a cycling shutdown: the MBC measured synchronous (first harmonic) shaft vibration above the limit at the impeller-end radial magnetic bearing while the unit was in Rotation mode.
At what vibration level does MBC - VW13 VIBRATION trip?
One manual gives greater than 60 µm from 0 to the peak amplitude, monitored above 80 Hz; the other gives greater than 45 micron peak amplitude, monitored above 70 Hz. Check which manual applies to your machine.
How is MBC - VW13 VIBRATION cleared?
It releases automatically when vibration drops below the limit — less than 60 µm or less than 45 micron. The MBC then remains in Levitation mode until it is commanded to de-levitate over serial comms or, per one manual, until the VSD DC buss power depletes.
Why does MBC - VW13 VIBRATION only appear at high speed?
Because the condition is monitored only when the AVR and ABS filter is on, which occurs for speed above 80 Hz in one manual and above 70 Hz in the other.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YMC2; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YMC2 messages: fault codes · YORK YMC2 documentation · YORK manuals