RXF PLUS MICROPROCESSOR CONTROL PANELS70-401 IOM
Page 10
SETPOINT DISPLAYS, Page 6*
LO SUCT STOP LD//./G
LO SUCT F-UNLD //./G
They are active only while the compressor is operating in
Temperature Capacity Control Mode. The two new setpoints
are Low Suction Press Stop Load and Low Suction Press
Force Unload. Both are entered as a pressure in gauge or
inches of mercury
(
H
g
)
. When suction pressure reaches the
stop-load setpoint, loading of the compressor is inhibited.
When the suction reaches the force-unload setpoint, the
compressor will unload until the suction pressure is greater
than the force-unload setpoint. Control will then be released
to allow normal operation.
SETPOINT DISPLAYS, Page 7*
MLC STOP LOAD=/// %
MLC FORCE UNLOAD=/// %
MLC STOP LOAD - The Motor Load Control Stop Load,
reported as a percentage of the motor full-load amps (FLA),
will prevent the compressor capacity control from loading
when the setpoint is equaled or exceeded. NOTE: Consult
motor manufacturer for recommended setpoint.
MLC FORCE UNLD - The Motor Load Control Force Un-
load, reported as a percentage of the motor full-load amps
(FLA), will force the compressor to unload until the motor
full-load amps (FLA) fall within 1% of the setpoint or lower.
NOTE: Consult motor manufacturer for recommended
setpoint.
SETPOINT DISPLAYS, Page 8*
HPCO=///G AUX1-al-nc
HPA =///G AUX2-sh-no
HPCO - The High Discharge Pressure Cutout, reported in
pounds per square inch gauge (G), will shut down the com-
pressor if the discharge pressure equals or exceeds this
setpoint.
HPA - The High Discharge Pressure Alarm, reported in
pounds per square inch gauge (G) will trigger a prealarm if
the discharge pressure equals or exceeds this setpoint.
AUX 1 and AUX 2 - May be configured for either an alarm
(AL) or shutdown (SH) and with either a normally closed
(NC) or normally open (NO) contact.
SETPOINT DISPLAYS, Page 9*
Sup Heat-AL-10F-yes
Sep Cond-Sh-10F-yes
The setpoints provided on this display allow monitoring of
compressor superheat and condensing in the separator. The
following setpoints apply to the monitoring of the superheat
and condensing in the separator.
ALARM/(SHUTDOWN) - The Alarm(AL)/(shutdown)(SH)
setpoints select the conditions for an alarm or shutdown. If
alarm is selected, the alarm will occur after a 30 second
delay. If shutdown is selected, the shutdown will occur 60
seconds after the alarm.
OFFSET - This setpoint is the degrees F above the satura-
tion-point temperature where the alarm or shutdown will
occur.
ACT - The function selects whether the alarm/shutdown is
activated or not.
SETPOINT DISPLAYS, Page 10*
RECYCLE DELAY=// MIN
CT FACTOR =///
RECYCLE DELAY - The Recycle Delay displays the cur-
rent recycle delay setpoint in minutes. NOTE: Consult mo-
tor manufacturer for recommended setpoint.
CT FACTOR - The Current Transformer Factor records the
proper current transformer factor to match the compressor
motor FLA rating to the current transformer primary amp
rating. The CTF factor is programmable and its correct value
is determined by the following formula:
1024 x FLA (Full-Load Amps *)
CTF =
10 x CT (Current Transformer Primary Amps **)
* See motor nameplate.
** See CT located in starter panel.
EXAMPLE: FLA = 230 Amps
CT = 300 (300:5)
1024 x 230
CTF = = 80 (Round to whole number)
10 x 300
SETPOINT DISPLAYS, Page 11*
LOW % FLA = /// %
Low Motor Amp Failure - This addition to the program was
added for the purpose of detecting a broken coupling. If the
micro detects that the motor current is at 20% FLA or below
(adjustable setpoint) for 2 minutes, then a “Low Motor Amp
Cutout” will occur. The default for the setpoint is 20% with a
range from 0% to 100%. If a setpoint of 0% is entered, this
will disable this feature.
Low % FLA - The low % FLA setpoint is used to determine
if the coupling has broken. A “Low % FLA” setpoint of 20%
is the default value. It is adjustable from 0 to 100% FLA.
Use the [Step] key to select this setpoint then enter the
desired setpoint and press the [Enter] key.
SETPOINT DISPLAYS, Page 12*
HDTC=212 HOTC=167
HDTA=194 HOTA=159
HDTC - The High Discharge Temperature Cutout, reported
in degrees Fahrenheit, will shut down the compressor if the
discharge temperature equals or exceeds this setpoint.
HDTA - The High Discharge Temperature Alarm, reported
in degrees Fahrenheit, will shut down the compressor if the
oil temperature equals or exceeds this setpoint.
OPERATION
* Display for illustrative purposes only.
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