ProTechTPS Total Protection System
Manual 26710V1
98
Woodward
Problem or diagnostic
indication
Possible Cause
Suggested Actions
Programmable relay output
not working
Wiring fault, terminal block
loose.
Configuration.
External supplies.
Verify the wiring and terminal block
connections.
Using the Programming and Configuration
Tool, check to see if the polarity is set
correctly and the correct internal signal is
selected to drive the output.
Check the power supplies that provide
voltage to the relay output. If using the 24
V EXT available from the ProTechTPS,
measure voltage between terminals 80, 81
and verify 24 V ±10%. If it is not, remove
the wiring from the 24 V EXT to unload the
output and measure again to verify the
voltage is not being overloaded.
Analog Output not working
Wiring fault, terminal block
loose.
Configuration.
Verify the wiring and terminal block
connections.
On the front panel, check the Monitor
Analog Output Menu and verify that the
analog output is reading an expected
output value.
Measure the current from terminal 64 and
verify it corresponds to the previous step.
Verify the load on the analog output is
within the electrical specifications.
Using the Programming and Configuration
Tool or front panel, verify the scaling is
correct.
MODBUS not working
Wiring fault, terminal block
loose.
Configuration.
Verify the wiring and terminal block
connections. In particular, verify the HI and
LO wires are terminated to the correct
terminals for RS-485 and likewise for TXD
and RXD for RS-232. Also verify the
termination jumpers are installed for RS-
485 mode.
Using the Programming and Configuration
Tool or front panel, verify the correct
settings are selected.
Programming and
Configuration Tool not
working
Wiring and connection.
COM Port.
Verify the cable plugged into the DB9 port
is not a crossover. A straight-through
cable is required.
Check that power is applied to the
ProTechTPS module and the service tool
is connected.
Verify the correct COM port is selected
when establishing communications and
that Auto Detection BAUD rate is selected.
Table 5-1. I/O Troubleshooting