Transition Of States - Parker AC890 Product Manual

Sequencing Logic
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.
1 Power Up
2 Switch On Disabled
3 Switch On Disabled
4 Ready To Switch On
5 Ready To Switch On
6 Ready To Switch On
B-4
Page
Current State Next State
Switch On
Disabled
Trip Active
Ready To
Switch On
Trip Active
Switch On
Disabled
Switched On
Cause (FALSE to TRUE)
Power-Up, Restore Configuration or exit from
Configuration mode.
Trip
RUN = FALSE, JOG = FALSE, NOT FAST STOP =
TRUE and NOT COAST STOP = TRUE
Trip
NOT COAST STOP = FALSE or NOT FAST STOP =
FALSE
RUN = TRUE or JOG = TRUE
890SD (Standalone) Drive: Frame G, H & J