SSD 605C Product Manual - Transition of States
9-2
Sequencing Logic
605C Frequency Inverter
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
another mode is demanded.
2.
Stopping is set TRUE during the stopping cycles commanded by either RUN
going low, JOG going low or if Fast Stop is active.
3.
Once Run and Jog are both FALSE, HEALTHY O/P will be set TRUE.
Transition of States
The transition matrix describes what causes the transition from one state to another, for example
see no. 5 below: the transition from “Ready To Switch On” to “Trip Active” is triggered by
“TRIP” going TRUE.
Refer to the following table and state diagram.
Current State
Next State
Cause (FALSE to TRUE)
1
Power Up
Not Ready To Switch On
Reset OR initialise
2
Not Ready To Switch On
Switch On Disabled
Initialise complete AND NOT re-
configuration mode
3
Switch On Disabled
Trip Active
Trip
4
Switch On Disabled
Ready To Switch On
NOT Run AND NOT Jog AND /Fast-Stop
AND /Coast-Stop
5
Ready To Switch On
Trip Active
Trip
6
Ready To Switch On
Switch On Disabled
NOT /Coast-Stop OR NOT /Fast-Stop
7
Ready To Switch On
Switched On
Run OR Jog
8
Switched On
Trip Active
Trip
9
Switched On
Switch On Disabled
NOT /Coast-Stop OR NOT /Fast-Stop
10
Switched On
Ready To Switch On
NOT Run AND NOT Jog
11
Switched On
Enabled
Inverter Enable
12
Enabled
Trip Active
Trip
13
Enabled
Switch On Disabled
NOT /Coast Stop
14
Enabled
Fast Stop Active
NOT /Fast Stop
15
Enabled
Switched On
NOT Inverter Enable
16
Enabled
Ready To Switch On
NOT Run AND NOT Jog
AND stop sequence complete
17
Fast Stop Active
Trip Active
Trip
18
Fast Stop Active
Switch On Disabled
Fast Stop timer expired OR Fast Stop Mode
= Coast Stop OR Inverter at zero setpoint
19
Trip Active
Tripped
Stack quenched
20
Tripped
Switch On Disabled
NOT Trip AND Trip Reset 0->1 transition
Table 9-3 Transition Matrix