Table of Contents
Advertisement
CHAPTER 4: SETPOINTS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
ALARM FUNCTION
Range: Disabled, Alarm, Latched Alarm
Default: Disabled
The selection of Alarm or Latched Alarm setting enables the alarm function.
ALARM TYPE
Range: Over, Under
Default: Over
This setting determines if alarm pickup will occur when the analog input is over or under
the programmed threshold.
ALARM PICKUP
Range: -500000 to 500000 units in steps of 1 unit
Default: 10
This setpoint provides the alarm pickup level in engineering units as defined in the
setting.
ALARM DROPOUT RATIO
Range: 2 to 20 in steps of 1%
Default: 5%
This setting represents the variation of pickup value, in percentage of pickup, at which
the alarm element will effectively drop out. The drop out ratio is defined as follows:
•
Drop Out = pickup – pickup * dropout ratio /100, when ALARM TYPE is Over
•
Drop Out = pickup + pickup * dropout ratio /100, when ALARM TYPE is Under
For example, if the pickup level is 5000 µA, ALARM TYPE is set to "Over" and DROPOUT
RATIO set to "10%", the actual dropout will be 4500 µA. Conversely, if the ALARM TYPE is
"Under" with the same dropout ratio, the actual dropout will be 5500 µA.
ALARM PICKUP DELAY
Range: 0 to 600 s in steps of 1 s
Default: 2
This setpoint will operate the element if the alarm pickup condition is maintained for a
longer time than the delay time set here.
ALARM DROPOUT DELAY
Range: 0 to 600 s in steps of 1 s
Default: 0
This setpoint selects a fixed time interval to delay dropping out the output signal after
being generated.
ALARM OUTPUT RELAY
Range: Do not operate, Operate
Default: Do not operate
Any, or all of the output relays 3 to 7 can be selected to operate, upon Threshold element
operation. The selection of the relay outputs operation is available no matter whether
the Latched Alarm or Alarm function is selected.
BLOCK
Range: Flexlogic Operand
Default: Off
EVENTS
Range: Disabled, Enabled
Default: Enabled
This setting enables or disables the events of the Analog Input function.
INPUTS
4–89
Advertisement
Table of Contents
