Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 58)

Description of Features 4-31
1503-UM054C-EN-P – June 2013
The Contactor status LED is off to indicate that the contactor is in an
Open condition and the Contactor status relay is Open to reflect the
status of the contactor thus preventing externally connected circuits
from functioning.
This condition is valid for both Electrically Held and Mechanically
Latched contactors.
Undervoltage with a CLOSE Command Preset
This is a Warning condition and the level of the input mains voltage
should be checked.
This indicates that the Basic module within the IntelliVAC Plus unit
has an input line under-voltage condition while the Close command
is present and the status of the contactor being controlled is in an
Open or Closed condition (dependant on the status of the contactor).
The Module status LED is flashing Yellow to indicate that there is an
under-voltage condition while the Close command is present and the
Module status relay is open, while the under-voltage is present and
closed once the condition is restored.
When a Close command is given and the line voltage is <95Vrms
and the TDUV setting is disabled or set to zero (see TDUV in
Chapter 4) then the Module status LED will flash. This will only
occur when the line voltage is <95Vrms and the Close command is
then applied. In this case the contactor will not even be picked up.
To have the contactor close, the line voltage must increase to
>95Vrms and the Close command must be removed and then
reapplied.
If the TDUV is enabled then the contactor must have been in the
hold state (electrically held contactors), the TDUV time must have
expired and the line voltage must decrease to <80V before the
module status LED flashes yellow. In this case the contactor will
drop out.
The Module status relay will be open if the voltage is still in an
under-voltage condition (<95Vrms without the contactor being
closed or <80Vrms during a hold condition and TDUV time expired)
or it will be closed if the voltage has been restored to >95Vrms.
The Contactor status LED is Yellow or off to indicate that the
contactor is in a Closed or Open condition and the Contactor status
relay is Closed or Open to reflect the status of the contactor thus
allowing or preventing externally connected circuits to function.