SBS System – SB-1000 Operation
11
Preparing to Set Operating Parameters
Ensure you fully understand the function and operation of the Control’s front display panel as
described in previous sections, before attempting the following operations.
Background Vibration
A check of the background vibration level must be performed, to correctly set up the system.
Install the Balancer, Control, and all cables as indicated in the installation section of the manual. Leave the
grinding machine off, press the Manual button to manually enter the operational RPM of the grinding
machine. Note this measured ambient vibration level without the machine running.
Turn on all secondary machine systems (such as hydraulics and motors), but leave the machine spindle
turned off. The vibration level displayed without the spindle running is the background vibration level for
the machine. Note this background vibration level for future reference in setting the operating parameters of
the system. Refer to the “Environmental Considerations” section for explanation of possible sources of
background vibration.
Verifying Balancer Sizing – Automatic Balance Mode
Using the Manual Weight Movement buttons, rotate the masses in the Balancer while the machine is
operating at speed. By running each of the two weights in opposite directions, the operator should be able to
introduce more than three microns of vibration in the grinding machine, but not more than thirty microns.
For grinders that operate at higher speeds (above 5000 RPM), the range of acceptable Vibration produced by
balancer movement should be lowered. If results do not fall within this range, it may be a sign that the
Balancer needs to be re-sized for your application. Contact your SBS Balance System provider for
consultation. In the interim, do not allow the grinder to operate for extended periods with high vibration
levels.
Limit
The SBS Balance System will automatically balance to a user specified low-limit of vibration, the Auto-
Balance Limit. The Limit represents the best balance achievable, and is the target vibration level during an
automatic balance cycle. It is factory set at 0.4 microns displacement. A balance Limit of 1.0 micron or less
is generally considered adequate for most applications. The Limit should be set
at least
0.2 microns higher
than the highest background vibration level noted in the “Preparing to Set Operating Parameters” section.
The lower the Limit is set, the longer the system will require achieving balance.
Some experience may
be necessary to determine the appropriate auto-balance Limit for a particular installation.
NO BALANCE SYSTEM IS CAPABLE OF BALANCING THE GRINDING WHEEL TO A VALUE
BELOW THE BACKGROUND LEVEL
. Trying to set the balance Limit below background levels will
result in long or failed balance cycles. Since the background vibration level is often a product of floor
transmitted vibrations, these levels may change as adjacent machines are put into or out of service.
Set the
balance Limit during periods when the system will receive the maximum floor transmitted vibration
.
Tolerance
This setting establishes an upper-limit for normal process vibration for the grinder. When reached, this
setting will cause an indication of the need to perform an Auto-Balance. Indications given on the front panel
for balance status are shown, and additional indication is given via. the Hardwire Interface. The Tolerance
level is typically it is set at least 1 micron above Limit setting.
Critical Vibration
This setting establishes an operational upper safety limit of vibration for the system. When reached, this
setting will cause an indication of the critical need to perform a re-balance operation. This indication on the
