Watlow 12LS Controller - Manual (Page 99)

7-1
7.0 TROUBLE SHOOTING INFORMATION
7.1 Stand Alone Systems
For stand alone systems the ANAFAZE 12LS should be returned to ANAFAZE when problems
occur. If the unit has no display check the input power supply.
Normally there are no components that can be field repaired. The 12LS can be checked at
ANAFAZE using a test fixture that checks the different boards.
If a spare unit is inserted set the entered values to the ones of the replaced unit. These values can
be stored and entered using a standard IBM PC or compatible computer and ANASOFT
software.
7.1.1 Checking Control Outputs
Control outputs can be checked by setting the loop to manual and the control output to the
desired level. An LED with a series 1K resistor can be connected across the output to see if it is
pulsing.
7.1.2 Checking Digital I/O
The digital I/O can be checked from the Test I/O menu. Again the LED with series 1k resistor
can be used to see the outputs pulse on and off.
7.2 Computer Supervised Systems
These four items must work together to operate the 12LS:
The 12LS
The computer including the RS-232 or other serial interface
The communications link
The computer software
If the system does not work on initial start up check the 12LS, the computer, and the serial link.
The 12LS first be checked in the stand alone mode. If there is a problem the 12LS should be
returned to ANAFAZE for service.
If ANASOFT is running in the system, when a unit is replaced, ANASOFT will detect a
controller reset [indicated on initial power up] and automatically reload the current parameters in
ANASOFT.
If the system includes multiple ANAFAZE 12LS controllers the address must be set to the
correct address. This should be done using a spare housing before plugging the unit into the
system housing.