Ssh; Control Variables; Introduction To Control Variables - ARP Fridge Defend Troubleshooting Manual

ARP Control v5.x Troubleshooting Guide
wire insulation is cut thereby resulting in what
is referred to as a dead short to ground.
Often it is faster to replace a wire all together
than test it.
Over amperage can come from a failing
component like bearings in a fan or a
resistive type short to ground. The best way
to test components is to measure the actual
amperage draw of a component. The trouble
with the amperage measurement is that
intermittent issues with components can
occur. Restated, intermittently the
component will draw high amperage resulting
in a trip, often this is caused by an event
such as turning on a fan, the fridge controller
switching from one mode of operation to
another such as activation of a defrost cycle
or switching from an AC heater to LP Gas
operation.
__________________________________________________________________________________________

CONTROL VARIABLES

8.1 Introduction to Control
Variables
The ARP sets the following control variables
to default values during an Auto Tune
session. If the default values need to be
adjusted, this section explains the variables
and their function. Please note that most
fridges work fine with the default settings.
8.2 SP
The SP variable simply raises or lowers the
set-point value depending on the setting.
Tuning the ARP for the maximum protection
for your refrigerator installation mostly
consists of finding the optimum value for SP.
If the value is too low, the control will shut off
your refrigerator unnecessarily. If the value of
SP is too high, the refrigerator will not restart
easily.
For a majority of refrigerators, the default SP
value for the C-L or PID Set-Point functions
is the best. Only if the fridge is being turned
off by the ARP Control when the user feels
that the fridge should remain running shall
Auto Tune be used. Please see
adjustment method for SP. SP is used only
04/20/202 0 © 2013-2020 ARPC L.L.C. All rights reserved.
It is an art to diagnose electrical issues. The
artisan needs an intimate knowledge of the
system under consideration, the ability to
read wiring diagrams, along with the
knowledge, skills, and abilities to use
electrical test equipment.

7.6 SSH

Where the 'AtS' value controls the startup
set-point when in PID control function, SSH
records the maximum steady-state value for
the fridge. By using the AbS to see if the
control has tripped at fridge start, that is AbS
≥ AtS, this will inform one if the OS value
needs to be increased. On the other hand, if
AbS < AtS, then the control is tripping at
steady-state and the SSH value will give an
indication of how to change the SP value to
raise the AtO value to avoid control trips
during steady-state.
for the C-L or PID mode of operation, C-H is
not affected by this setting; see
adjustment of C-L/PID Set-Point functions.
Basics for the SP Variable:
• Auto Tune sets SP to a default value of 5.
• SP may be changed to any value
• It is recommended to set SP to a
Factors that Affect the SP Variable:
• Auto Tune Elevation: Some refrigerators,
2.12 for
• Ambient Temperature: The air
between 0 and 30, where each increment
is ~1°C (~1.8°F).
minimum setting of SP= 1.
not all, have a colder gas flame at high
altitude. Thus, if the ARP is Auto Tuned
at an elevation greater than 1000' above
sea-level, the SP variable should be
raised by about 2°C per 1000' of
elevation decrease. This adjustment will
allow the operator to drive from an
altitude that the ARP was Auto Tuned at
to sea-level without a false trigger of the
control due to the rise of the gas flame
temperature.
temperature has a slight effect on the
16
2.16 for