MP-3000 Controller
57
• Control circuit fuse and circuit breaker
protection:
• 7 amp manual reset circuit breaker
protects the 24 Vdc control circuit.
• 2 amp fuse protects the 28V ac control
power circuit to the controller.
• 2 amp fuse protects the battery charger
output circuit to the controller.
• Electronics for measuring phase sequence.
• Electronics for measuring amperage.
• Electronics for measuring voltage.
• Zero current transformer for earth leaking
measurement (option).
8. Replaceable sensors: return air, left hand
supply air, right hand supply air, evaporator
coil (defrost), condenser coil, ambient air and
compressor discharge line temperature sensors
are field replaceable. Three (replaceable)
spare sensor receptacles are also provided for
USDA temperature recording.
9. Probe test (see “Probe Test” in this chapter).
10. Defrost cycle control (see “Defrost System” in
this chapter).
11. Pre-trip (PTI) test capability (see “PTI
[Pre-trip] Test” in this chapter).
12. Function test capability (see “Function Test”
in this chapter).
13. Data recording capability (see “Data
Recording and Downloading Data” in this
chapter).
14. Electronic phase selection: The
microprocessor relay board monitors the
phase of the power supply to ensure proper
rotation of the condenser fan and evaporator
fans. The controller determines the correct
phase sequence for the compressor and
energizes the correct compressor contactor.
15. Power limit control (see “Power Limit Mode”
in this chapter).
16. Sequential component start-up control: A
sequence start of the required loads occurs
during initial start-up of the controller and
when a control mode shift requires the
compressors to start (see “Sequence of
Operation” in this chapter).
17. Compressor refrigerant injection cycle control
(see “Compressor Liquid Injection” in this
chapter).
18. Hourmeters: The MP-3000 controller has
multiple built-in hourmeters that can be
accessed through the Main menu.
19. Manual emergency control capability. Manual
control settings in the control box allow the
unit to operate even in the event of a fatal
failure of the controller. Manual control offers
three operating functions: Heat, Defrost and
Cool (see “Manual Emergency Mode
Operation” in this chapter).
20. Flash memory: Flash program memory allows
the application software to be updated without
replacing an EPROM chip on the controller.
Application software can be updated in the
field using a portable computer and a Loader
program. Consequently, the field installed
application software version may have a
different revision number and may include
control features not included in the original
factory installed software. If the operation of
your unit differs from the Sequence of
Operation described for the unit in this
manual, enter “MISC. FUNCTIONS” in the
Main menu to check that the program version
is correct (see “Menu Operating Instructions”
in this chapter).
To Next Page
Loading...
Need help?
General
