-15-
Pump Motor
Overload Protector
Three phase units with three phase pump motors have a pump motor
overload protector.
The overload protector prevents the pump motor from exposure to
excessively high current. If an overload fault occurs, due, for example, to a
heavy work load, the controller will display
OL
and the unit will shut down.
The overload protector will automatically reset after about two minutes. The
unit must be manually restarted.
Displaying Software
Version
This procedure will display the software version number on the units display.
In the event the unit is not operational, the software version (and the check-
sum) can also be read from the label which is on the microprocessor chip
itself.
The following chart uses an example of software version 000550.93A
begin at the reservoir temperature display
2 0 . 3
° C
Press and hold NO for at least 10 seconds.
0 5 5 0
displays software version digits to
left
of decimal. Note the two leading zeros
do not display.
Press NEXT
9 3
displays software version digits to
right
of decimal.
Press NEXT
1
displays software version revision letter (as its equivalent number - display
cannot show letters. A=1, B=2, etc.)
Press NEXT
0 0 0 0
displays checksum - this can be disregarded
Press NEXT
2 0 . 3
° C
returns to reservoir temperature display
Summary of Contents for NESLAB System IV
Page 19: ... 18 Section VII Diagrams Flow Diagram ...
Page 20: ... 19 Rear View ...
