20 • MultiFlex CUB-II and CUB-TD I&O Guide
026-1705 Rev 7 06-APR-2010
Resetting a Compressor Proof Failure
Resetting a Compressor Proof Failure Safety
mode can be done manually by closing the
Alarm Reset input on the CUB or by resetting
the
Compressor Proof Fail
alarm in the E2 or
Einstein alarm log.
You can also program the CUB-II to auto-
reset when the proof input state indicates the
compressor is physically behaving as com-
manded. When using auto-reset, you may also
set a maximum number of auto-reset attempts.
The CUB-II will only attempt an auto-reset if it
has not already auto-reset the CUB-II a number
of times in the past hour equal to the user-
defined maximum. If CUB-II’s auto-reset maxi-
mum has already been met, it will remain in
Compressor Proof Fail mode until it is manually
reset.
6.5.3. Compressor Oil Failure Safety
Mode
The CUB-II can monitor compressor oil
pressure using either an oil pressure transducer
or a digital oil pressure switch. When a low oil
pressure condition occurs, CUB-II can be pro-
grammed to lock the compressor OFF to prevent
equipment damage.
Resetting an Oil Failure
Resetting an Oil Fail Safety mode can be
done manually by closing the Alarm Reset input
on the CUB or by resetting the “Oil Failure”
alarm in the E2 or Einstein alarm log.
You can also program the CUB-II to auto-
reset when the oil failure input state indicates the
oil pressure has returned to normal. When using
auto-reset, you may also set a maximum number
of auto-reset attempts. The CUB-II will only
attempt an auto-reset if it has not already auto-
reset the CUB-II a number of times in the past
hour equal to the user-defined maximum. If
CUB-II’s auto-reset maximum has already been
met, it will remain in Oil Fail mode until it is
manually reset.
6.5.4. Phase Fail Mode
If a phase fail checking device is present on-
site, the CUB-II can be programmed to shut
down multiple-phase devices it controls.
To enable phase protection, a digital phase
fail checking device must be connected to one of
the CUB-II’s physical inputs. When this input
signifies a phase failure has occurred, the CUB-
II immediately shuts down the compressor, the
condenser fans, and the defrost output. CUB-II
will lock these devices OFF until the phase fail-
ure is over.
6.6. Door Switches and Clean
(Wash) Switches
The MultiFlex CUB-II has special modes of
operation to accommodate use of freezer door
switches and clean (or wash) switches.
6.6.1. Door Switches
If the CUB-II is controlling refrigeration in a
walk-in freezer or other case type that has a door
switch equipped, the CUB-II may be pro-
grammed to shut off the compressor and fans
when the door is open. The CUB-II will lock the
compressor and case fans OFF until the door is
closed, at which time it will resume normal
refrigeration control.
The CUB-II may be programmed with an
alarm time
and a
fail-safe time
. If the door is
open longer than the alarm time, the E2 or Ein-
stein controlling the CUB-II will generate an
alarm to warn store personnel that the door has
been left open. If the door is open longer than the
fail-safe time, the CUB-II will resume refrigera-
tion to prevent product loss.
NOTE: CUB-II will not lock out evaporator
fans when a phase fail occurs, because these
are single-phase devices.
