HGL Manual
6.0 PQconnect Troubleshooting
42
Contactor Problem
Parameter 257 Contactor Status can be used to determine why the PQconnect board is not closing
the tuned circuit contactor. The following tables define what a specific contactor status code value
means and list potential resolutions to allow the contactor to close.
Note that some setpoint parameters require tech level parameter access to be viewable over the
serial connection or via the PQvision software. The tech level parameter access key is available
above.
Table 30: Contactor Codes
Code
Description
Resolution
1
Contactor is already
commanded closed.
The PQconnect is presently commanding the tuned circuit contactor to be closed. If
the contactor is not closing check the wiring from the PCB J11 control relay header
to the tuned circuit contactor and 120VAC control power transformer.
2
Contactor is open due to
a Force Open control
mode.
The present contactor control mode (feedback parameter 250) is set to Force Open.
This control mode will always keep the contactor open. To change the control mode,
see setpoint parameter 510.
3
Contactor is open due to
an automatic load control
mode and insufficient
load Amps to close the
contactor.
The present contactor control mode (feedback parameter 250) is set to Automatic
Load Control and the measured filter load Amps are below the configured close
threshold (feedback parameter 270). The contactor will be closed when the filter load
Amps exceed the close threshold. The contactor close filter load current threshold
can be adjusted via setpoint parameter 570. The contactor close threshold parameter
is scaled in units of percent rated nameplate filter current.
4
Contactor is open due to
an automatic kVAR
control mode.
The present contactor control mode (feedback parameter 250) is set to Automatic
kVAR Control and closing the contactor would exceed the max allowable kVAR
flowing to the source to be exceeded (feedback parameter 272). The contactor will
be closed when the inductive load kVAR minus the capacitive tuned circuit kVAR of
the passive filter is below the max kVAR setpoint parameter. The max kVAR setpoint
parameter can be adjusted via setpoint 572.
5
Contactor is open due to
an external contactor
open command.
The present contactor control mode (feedback parameter 250) is set to External
Control and the external command is set to open the contactor. The external
contactor control command is wired to the PQconnect PCB header J7 where shorting
pins 1 and 2 of that header equal a close command.
The internal state of the external control command can be audited via feedback
parameter 320 in bit position 0. If an external contactor close command is correctly
being input to the PQconnect board then confirm the J7 header input is configured
as the external control command by verifying feedback parameter 321 is set to a
value of 2=external command input. If the input configuration parameter 321 is not
set to 2=external command input the input configuration can be changed via setpoint
parameter 610.
6
Contactor is open
because the PQconnect
has been configured
without a contactor.
The present contactor control mode (feedback parameter 250) is set to No Contactor
Mode. No Contactor mode is typically reserved for HGL units that do not include a
tuned circuit control contactor. If your HGL unit does include a tuned circuit contactor
but the PQconnect is configured to not support a contactor, please call TCI technical
support.
