11
SECTION TWO
FAULT INDICATORS
AND MESSAGES
STATUS MESSAGES
A variety of messages are displayed by the control card. Some of
these indicate the operational status of the unit while others provide
warnings of an impending fault. In addition, there are the alarm
messages which indicate that the unit's operation has stopped due to
a fault condition. In this section we will deal with only those messages
which interrupt the unit's operation. A complete list of status messages
can be found in the Instruction Manual. Along with the control card
message, the interface board contains several Light Emitting Diodes
(LED's) which aid in the identification of the fault condition.
CURRENT LIMIT
This message will flash in the display when the unit is operating above
the current limit setting as recorded in parameter 209. Parameter 310
may be set to provide a fixed time delay after which the unit will trip.
REF FAULT
This message will flash in the display should any live zero signal be
operating outside of its range. For example, 4-20ma has been selected
as the speed reference. Should the current loop be broken, the display
will flash "REF FAULT". Parameters 414 and 415 may be used to
select the unit's response to this condition.
NO 24 VOLT
This message will flash if the 24 volt power supply is missing or out of
tolerance. The 24 volt supply is used only for the customer's remote
connections.
NO MOTOR
This message will flash if Motor Check has been activated in parameter
313, terminal 27 is enabled and no motor is detected.