Watlow Series D8 - Manual (Page 187)

Series D8 User’s Guide Chapter 7: Troubleshooting and Reconfiguring
Doc. 0600-3120-2000 Watlow Anafaze 169
put is on (100 percent), the output voltage should be be-
tween +4.75 and +5.25V.
7. If you are testing a digital output not used for control, use
the I/O tests menu to turn the output on and off. See Test
Digital Output 1 to 20 on page 153.
Testing Digital Inputs
1. Switch off power to the controller.
2. Disconnect any system wiring from the input to be tested.
3. Restore power to the controller.
4. Go to the Digital inputs parameter in the I/O tests menu.
5. Attach a wire to the terminal of the digital input to test.
When the wire is connected only to the digital input ter-
minal, the Digital inputs parameter should show that the
input is off ( 0). When you connect the other end of the
wire to controller common (TB50 terminal 3), the Digital
inputs
parameter should show that the input is on (1).
Clearing the RAM
Clearing the random access memory (RAM) returns all con-
troller settings to their defaults. All stored jobs are also cleared
from controller memory.
To clear the RAM:
1. Make a record of all controller settings.
2. Switch off power to the controller.
3. Press and hold <.
4. Switch on power to the controller while still holding <.
5. When you see the prompt Clear RAM?, release < and
press ..
6. Restore the controller settings.
NOTE! If your controller does not have a keypad and
display, you can clear the RAM by powering
the controller up with pins 1 and 6 on the key-
pad header (J3 on the bottom circuit card)
shorted. After clearing the RAM, power down
the controller and remove the jumper wire
from the keypad header before putting the
controller back in service.