Document #: 020-17475-00 Revision: E
Page #: 46 of 63
Upon alarm reset the system will return to one of the following:
a)
Manual Mode idle condition: if at the moment of alarm the mixer is in Remote
mode or idled in Manual mode.
b)
Manual Mode pause condition: if at the moment of alarm the mixer is in
Manual mode.
c)
Automatic mode idle condition: if at the moment of alarm the mixer is idled in
automatic mode.
d)
Recipe run pause condition: if at the moment of alarm the mixer is in
Automatic mode.
e)
Power up mode: if a Motor or Cryo Controller failure occurs as they require
power cycling for reset.
Five types of failure can stop the current job:
1.
Manual E-Stop
: When an operator presses the E-Stop button on the LevMixer, the
motor rotation immediately stops and the ALARM appears on the screen. To reset
the unit follow the following steps:
a)
Release the E-stop button by pulling it until it clicks.
b)
Press the ALARM button. The failure detection screen will then open.
c)
On the failure detection screen identify the E-stop failure in the blinking bullet.
Note: the date and time of the failure event is indicated on this screen.
d)
Press the RESET button to return the unit to operation.
2.
Coupling Off-Range
: If the measured RPM is outside the coupling range for longer
than the specified Coupling time, the impeller may have decoupled from the
mixer’s drive. When this occurs, rotation is stopped and the ALARM appears on the
screen. The operator should do the following steps:
a)
Press the ALARM button. The failure detection screen will then open.
b)
On the failure detection screen identify the Coupling Off-Range failure in the
blinking bullet. Note: the date and time of the failure event is indicated on
this screen.
c)
Press the RESET button to return the unit to operation.
3.
Speed Off-Range
: If the measured RPM deviates from speed set point outside the +/-
5 RPM limits for more than 60 sec, the speed control may be functioning improperly.
When this occurs, rotation is stopped and the ALARM appears on the screen. The
operator should do the following steps:
a)
Press the ALARM button. The failure detection screen will then open.
b)
On the failure detection screen identify the Speed Off-Range failure in the
blinking bullet. Note: the date and time of the failure event is indicated on
this screen.
c)
Press the RESET button to return the unit to operation.
IMPORTANT:
The Speed Off-Range Alarm is not generated in remote mode of
operation. In this case current speed and set point are controlled externally.
4.
Motor Failure
: If the mixer’s drive motor experiences an error, it signals the PLC. The
mixer then stops rotation and displays ALARM on the screen. The operator should do
the following steps:
a)
Press the ALARM button. The failure detection screen will then open.
