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Manual 35086
ProTech-GII with Math Functions
Woodward
169
Problem or
Diagnostic Indication
Possible Cause
Suggested Actions
Trip relays not working
Wiring fault, terminal block
loose.
Configuration
External supplies
Verify the wiring and terminal block
connections.
Using the Programming and Configuration
Tool or front panel, check to see that the
trip configuration is set correctly. Energize
to trip vs. de-energize to trip will invert the
polarity on the relays.
Check the power supplies that provide
voltage to the relay output. If using the 24
V EXT available from the ProTech-GII,
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.
Alarm relay output not
working
Wiring fault, terminal block
loose.
External supplies
Verify the wiring and terminal block
connections.
Check the power supplies that provide
voltage to the relay output. If using the 24
V EXT available from the ProTech-GII,
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 Analog
Output on the Monitor Summary screen
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 PCT 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
terminations jumpers are installed for
RS-485 mode
Using the PCT or front panel, verify the
correct settings are selected.
Released