CAMBRIDGE qt 300 Installation & Operation Manual - page 24
page 24
Changing Masking Level Using MCS
Follow these steps to update the parameters within the masking level
block:
1. Review – selecting the review button will allow the user to select
a zone and see the current configuration. Click on the zone on
the right side of the operations screen.
2. To modify a zone, start by clicking the modify button.
3. Select the zones to modify by checking the boxes of the zones
on the right side of the operations screen.
4. To set the masking level, use the multi-select for max. and min.
settings in the left box.
5. Select Submit to commit the values.
NOTE: Only modify one block at a time and then click submit. If
you modify both zone masking and Time of Day, only one window
is updated. The suggested volume setting is discussed earlier in the
Introduction section.
If a portion of a zone is louder than the rest of the zone due to a
difference in acoustics, it should either be a different zone of the
volume lowered using the adjustment on the back of the emitters.
The volume will still change based on the value of the controller, but
the output can be turned down 3,6 or 9 dB from the value set at the
controller.
Auto Ramping
The Auto Ramping function is typically used once, when the system
is first installed. The Auto Ramping function is used to introduce
sound masking into an occupied space gradually. The Auto Ramping
function sets the operational volumes for a zone a specified num-
ber of dBA below its programmed value. The control module will
raise the zone’s operational level by 1 dBA per weekday until the
Auto Ramping value is back to zero and the zone is operating at its
specified “Max” and “Min” values. If the system is running “quiet,”
check that Auto Ramping has been set properly. The Auto Ramping
control is also a useful means of temporarily lowering the volume in
a zone. This may be necessary if, for instance, there is a problem with
some other electrical or mechanical system and maintenance needs
absolute quiet to listen for the source. By using the Auto Ramping
control, if the administrator forgets to shut off auto-ramping, the
control module will gradually ramp back to the operational levels. If
the administrator had “Muted” the zone using the “Max” and “Min”
levels, masking would remain off indefinitely until someone set off to
correct the problem.