Johnson Controls FRICK QUANTUM LX Operation page 43

represent 3600 rpm on a 3600 rpm – 60 hz
motor. Selectable from 1-100% of the 4-20
mA signal.
• [Minimum Drive Output] - This setpoint
represents the minimum signal to the drive
from the Quantum™ LX, where 20% would
represent 720rpm on a 3600 rpm – 60 hz
motor. Selectable from 1-100% of the 4-20
mA signal.
Remote Control - Provided For backward com-
patibility to older control systems if necessary.
Preferred method of control is by the Quantum
LX.
• [Rate of Increase] - The rate of speed in-
crease over the duration of the Delay set-
point when either a serial load command is
received or a digital load signal is received.
• [Rate of Decrease] - The rate of speed
decrease over the duration of the Delay
setpoint when either a serial unload com-
mand is received or a digital unload signal
is received. This also sets the rate at which
the panel will cause a Force Unload for high
or low pressure and separator velocity. For
Force Unloading the Rate Of Decrease is
two times the value of the setpoint.
Capacity Control – The fi rst setpoint in the Ca-
pacity Control section [95%] is the slide valve
position at which the speed will be allowed to
increase to maintain the capacity control set-
point. It also represents the slide valve position
of which the speed will increase proportionally to
QUANTUM™ LX COMPRESSOR CONTROL PANEL
OPERATION
the value of the second setpoint [20%] from the
Minimum Output setpoint. If the second setpoint,
also known as the Proportional Speed setpoint
was set at [50%] the speed would increase pro-
portionally from the Minimum Output setpoint
[20%] to [50%] as the slide valve loads from 0%
to 95%. In this case, that would be an increase of
approximately 1% speed to every 3% slide valve.
Skip Frequency Bands - These setpoints provide
the ability to lockout 5 frequency bands where
abnormal noise may occur due to the resonance
of various components throughout the speed
range. The slide valve needs to be at 100% when
the speed range is run through to detect these
bands. The limit is 5% from bottom to the top of
each band lockout.
During drive ramp up, these bands will be
skipped.
Defi ned frequency SKIP areas
090.022-O (MAY 12)
Page 43