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Sequencing Logic
4-1
690+ Series Frequency Inverter
4
S
EQUENCING
L
OGIC
S
TATES
Principle State Machine
The Inverter’s reaction to commands is defined by a state machine. This determines which
commands provide the demanded action, and in which sequence.
Main Sequencing States
The main sequencing state of the unit is indicated by an enumerated value given by the
parameter SEQUENCER STATE under SEQUENCING LOGIC menu at level 3.
Enumerated
Value
Main Seq State
Standard Name
Description
0
START DISABLED Switch On Disabled
The Inverter will not accept a
switch on command
1
START ENABLED
Ready To Switch On
The Inverter will accept a switch
on command
2
SWITCHED ON
Switched On
The Inverter’s stack is enabled
3
READY
Ready
Waiting for Contactor to be
closed
4
ENABLED
Enabled
The Inverter is enabled and
operational
5
F-STOP ACTIVE
Fast-Stop Active
Fast stop is active
6
TRIP ACTIVE
Trip Active
The Inverter is processing a trip
event
7
TRIPPED
Tripped
The Inverter is tripped awaiting
trip reset
Table 4-1 Enumerated Values for the SEQUENCING LOGIC Function Block
State Outputs of the SEQUENCING LOGIC Function Block
The following table shows the states of individual parameters for the SEQUENCING LOGIC
function block required to produce the condition of the MAIN SEQ STATE parameter.
START
DISABLED
START
ENABLED
SWITCHED
ON
READY ENABLED F-STOP
ACTIVE
TRIP
ACTIVE
TRIPPED
Tripped
FALSE FALSE FALSE FALSE FALSE
FALSE
TRUE TRUE
Running
FALSE FALSE FALSE FALSE TRUE FALSE
FALSE FALSE
Jogging
FALSE FALSE FALSE FALSE Note
1
FALSE
FALSE FALSE
Stopping
FALSE FALSE FALSE FALSE Note
2
TRUE
FALSE FALSE
Output
Contactor
Depends
on
previous
state
Depends
on
previous
state
TRUE TRUE TRUE
TRUE
TRUE
FALSE
Switch On
Enable
FALSE TRUE TRUE TRUE TRUE TRUE
TRUE FALSE
Switched
On
FALSE FALSE TRUE TRUE TRUE TRUE TRUE FALSE
Ready
FALSE FALSE FALSE
TRUE TRUE TRUE TRUE FALSE
Healthy
TRUE TRUE TRUE TRUE TRUE
TRUE
FALSE
FALSE
Note 3
Table 4-2 Parameter States for the MAIN SEQ STATE Parameter
Note:
1.
JOGGING is set TRUE once the jog cycle has started, and remains TRUE until the
jog cycle has finished which is when either the stop delay has finished or