Sequencing Logic
Page
B-4
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
8
9
10
11
A
B
C
D
1
2
3
4
5
6
7
E
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
RUNNING going low,
JOGGING going low or if Fast Stop is active, i.e. SEQUENCING LOGIC is F-STOP 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
number 4 below: the transition from “Ready To Switch On” to “Trip Active” is triggered by “TRIP” going
TRUE. Note – where a state has more than one exit transition, the transition with the lowest number has
priority.
Refer to the following table and state diagram.
Current State
Next State
Cause (FALSE to TRUE)
1 Power
Up
Switch On
Disabled
Power-Up, Restore Configuration or exit from
Configuration mode.
2
Switch On Disabled
Trip Active
Trip
3
Switch On Disabled
Ready To
Switch On
RUN = FALSE, JOG = FALSE, NOT FAST STOP =
TRUE and NOT COAST STOP = TRUE
4
Ready To Switch On Trip Active
Trip
5
Ready To Switch On Switch On
Disabled
NOT COAST STOP = FALSE or NOT FAST STOP =
FALSE
6
Ready To Switch On Switched On RUN = TRUE or JOG = TRUE
