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6.23. Over-Current Protection
Current is measured using the two current transducers
installed on the controller. If the current exceeds
the compressor MCC, the controller will stop the
compressor for 3 minutes and signal error E23. A
separate parameter MC2 is available to allow adjust
the maximum current value down, but not up, in the
advanced options menu.
To avoid any fault triggering during the compressor
startup period caused by the high inrush current,
current sensing in not processed by the controller until
6 seconds after compressor startup.
If the compressor trips more than 5 times in an hour
(default) on high current, the controller will lock out
the compressor and display an L23 lockout, requiring
a manual reset or the controller power to be reset. If
the parameter oCn, which is available in the advanced
options menu, is set to 0, then the unit will always reset.
6.24. Incorrect Phase Sequence Protection
(3 Phase Only)
The controller determines whether the sequence of
three phase supply lines is proper or not. The voltage
sensing terminals are connected to the 3-phase supply
of the compressors. If an incorrect phase (L1, L2, and
L3) is detected, the controller will trip compressor
immediately and display an L21 lockout code. The
compressor will not restart until the power to the unit is
turned off and L1 and L2 are switched. The reset button
will not work with this error.
6.25. Loss of Phase Protection - Current (3 Phase
Only)
The unit controller detects whether or not all the three
phase supplies are available. If a phase is missing, the
controller will shut down the compressor and display
an E20 error code and prevent the compressor from
restarting for 3 minutes. If the unit is shut down more
than 5 times in an hour (default), then unit will lock out
and display an L20 lockout code. If the parameter (PEn)
is set to 0, the unit will always automatically reset.
© 2016 Emerson Climate Technologies, Inc.
6.26. Open Run Circuit (Single Phase Only)
After the compressor is started and runs for 6 seconds, if
the there is no run circuit current and the start current is
still greater than 1 amp, the controller will display an E24
error for open run circuit and shut down the compressor.
The compressor will not restart for 3 minutes in the
event of a trip.
If the unit is shut down more than 5 times in an hour
(oCn), then the unit locks out and display a L24 lockout
code. If the parameter (oCn) is set to 0, the unit will
always automatically reset.
6.27. Open Start Circuit (Single Phase Only)
Immediately after startup, if there is no start current for
the first 500ms and the run current is greater than 1 amp,
the controller will display an E25 error for open start
circuit and shut down the compressor. The compressor
will not restart for 3 minutes in the event of a trip. If the
unit is shut down more than 5 times in an hour (oCn),
then the units locks out and display an L25 lockout code.
If the parameter (oCn) is set to 0, the unit will always
automatically reset.
6.28. Over/ Under Voltage Protection
If the voltage drops below 10% of the minimum rated
voltage or above 10% of the maximum rated voltage for
1 second, the controller will shut off the compressor and
display an E26 (under voltage) or E27 (over voltage)
error code until the voltage is back within acceptable
range and the compressor has been off for 3 minutes
(oCn).
If the compressor trips more than 5 times per hour
(Default), the controller will lock out the compressor,
requiring a manual reset or the controller power to be
reset. If the parameter (PEn) is set to 0, then the unit will
always reset. The controller will display an L26 (lockout,
under voltage) or L27 (lockout over voltage).
6.29. Phase Imbalance (3 Phase Only)
If the voltage in a given leg drops below 5% of the
average voltage of the 3 legs for 1 second, the controller
will display E22 and shut the unit down (based on
a parameter PiC) for 5 minutes and until the phase
imbalance is corrected.
15
AE5-1412 R1
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