Watlow PPC-2000 - Manual (Page 176)

Chapter 4: Troubleshooting PPC-2000 User’s Guide
150 Watlow Anafaze Doc.# 30002-00 Rev 2.3
PPC-2030 Encoder In Analog Out
Refer to the following descriptions of LED indicators when
troubleshooting the encoder input analog output module.
• Green Status LED remains off, on, or blinks
incorrectly: If counter input scanning is properly
functioning, the green LED blinks. If the LED remains off,
on, or blinks incorrectly, the module is not functioning.
Corrective Actions:
Make sure the rotary switch is set to the proper module ad-
dress. Each module must have a unique address.
Cycle power to the PPC-2000 system.
Check that the modules are connected properly; refer to
Module Assembly on page 24.
Perform a RAM clear; refer to Resetting Closed-Loop
Control Parameters on page 156.
Replace the module.
• LED indicators are OK but pulse inputs are not seen
or are incorrect: Some or none of the wired input data is
being transferred to the system. This may be an indication
of a software or hardware problem.
Corrective Actions:
Ensure that inputs are wired to the correct pins on the
high density cable connector or EITB.
Check that the cable is connected to the correct port. The
connector closest to the back carries pulse inputs 1 and 2.
The connector closer to the face of the module carries pulse
inputs 3 and 4.
Make sure that the module has been configured properly
for quadrature vs. single phase pulse inputs for each
channel used. A quadrature encoder connected to an input
configured as a single-phase will appear to operate back-
wards. Rotation that should increase the count decreases
it, and vice versa. Refer to Figure 2.5 on page 20 for in-
structions on setting switches for the encoder inputs.
• LED indicators are OK but analog outputs are not
seen or are incorrect: Some or none of the wired input
data is being transferred to the system. This may be an
indication of a software or hardware problem.
Corrective Actions:
Ensure connections to terminal blocks are correct. Refer to
Analog Output Connections on page 60 for analog output
wiring.
Be sure the software configuration matches the hardware
setup.
Check that the jumpers are set correctly. See PPC-2030
Jumper Settings on page 20.