Johnson Controls FRICK QUANTUM LX Operation page 45

here for informational purposes only.
• Mode – This value is read from a switch
within the DBS, and will show whether the
starter is set to run at Constant Current, or
is set to Step Ramp. This is set at instal-
lation and is shown here for informational
purposes only:
• Constant Current - In this mode, the cur-
rent during starting is maintained at a con-
stant level, fi eld adjustable from 200 to
425% of FLA. At full speed, the current is
determined by the motor load.
• Ramp - In this mode, the starting current
quickly reaches the constant current level
and then ramps up to 500% FLA. The ramp
time is adjustable from 3-30 seconds. At
full speed, the current is determined by the
motor load.
• Heatsink Temperature – This will display
the value of a heatsink thermostat that is
located on the DBS control board. If this
thermostat opens (at 85° C), a fault will oc-
cur, and the motor will shutdown. The unit
will only be able to re-start when this ther-
mostat resets (after be allowed to cool) at
60° C.
• RTD Temperature – An RTD (resistive)
temperature sensor is located on the DBS
starter. This value is compared against the
RTD Temperature Warning Level and RTD
Temperature Trip Level setpoints and if the
value shown exceeds either of these set-
points, either a warning or a trip will occur.
• Thermal Capacity – The allowable amount
of thermal energy that can be absorbed be-
fore damage may occur to the motor. This
value is based upon an internal calculation.
• DBS Time Until Start – The motor has ex-
ceeded its Thermal Capacity and will not
be allowed to start until enough time has
elapsed to allow the motor to cool.
• Bypass Time – When the controller is set
for Constant Current, a 10-position switch
(SW3) on the main control board of the DBS,
(adjustable from 3-30 seconds) sets the by-
pass time. The bypass time for Step Ramp
mode is 5 seconds, plus Ramp time.
• Ramp Time – A 10-position switch (SW3),
on the main control board of the DBS, is
QUANTUM™ LX COMPRESSOR CONTROL PANEL
OPERATION
adjustable from 3-30 seconds and sets the
time in seconds in which the current rises in
the Step Ramp mode from its initial Current
Step level to 500% FLA.
• Constant Current Level – A 10-position
switch (SW2), located on the main control
board of the DBS, sets the initial current
step of the controller in either Constant
Current or Step Ramp mode. This switch is
adjustable from 200-425% FLA for smooth
acceleration. When the controller is set for
Constant Current, this switch sets the maxi-
mum current limit for the motor in this mode
of operation. This current is maintained un-
til the motor reaches full speed. When the
controller is set for Step Ramp, this switch
sets the initial current limit, and then allows
the controller to continue its ramp to 500%
FLA.
• Thermal Overload Status – If this feature
has been enabled, then a trip will occur
if the thermal energy stored in the motor
exceeds 100% of motor Thermal Capacity.
The estimated temperature of the motor
windings is calculated based on the high-
est phase current. The overload trip level is
computed based on the following setpoints:
Full Load Amps, Locked Rotor Current, Stall
Time, and Service Factor. A start will not
be allowed until the motor has suffi ciently
cooled.
The following setpoint boxes are provided. These
setpoints are updated via communications to the DBS
controller. When a setpoint has been changed and
submitted from the Quantum™ LX, it is sent to and
updates the DBS:
• Locked Rotor Current
• Stall Time
• Jam Current Level
• Current Unbalance Alarm Delay
• RTD Temperature Alarm Level
• RTD Temperature Alarm Delay
At the bottom of this screen is a button labeled as
[Load Factory Defaults]. Selecting this button will
cause the above listed setpoint values to be re-writ-
ten with the original factory setpoints. These set-
points are sent from the DBS panel via communica-
tions into the Quantum™ LX.
NOTE: Contact RAM Industries Inc., in Leesport, Pennsyl-
vania at 800-220-8697 with any further questions con-
cerning the setup and operation of the RAM DBS.
090.022-O (MAY 12)
Page 45