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Operation
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5.6 Auto Reset Timing Diagrams
Fig 5.6.1: Auto Reset - Two Wire -Three Phase Supply Loss
The timing diagrams show the auto reset with a maintained two wire control system
The fault shown is a 3-phase supply loss only, the Control Supply maintained
The 3-Phase power is re-established (after the 2nd attempt ) before the Reset Attempts counter is depleted
This assumes the start signal is maintained, if it is removed the Auto Reset terminates
Once power has been re-established there are no further outages and the counters are reset after the trip free time.
3-Phase Supply voltage
Control Supply
Start / Stop Input
Reset Input
(1)
Fault Relay
Restart Pending Relay
Imotor
Internal Reset
Reset Attempts PNU = 4
t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10
Sequence of events User Parameters (R/W) Monitor Parameters (R/O)
t0 3 phase supply applied PNU Range Default PNU Range
t1 Start signal applied, motor starts
t2 Motor reaches full voltage Auto Reset Off / On Off A uto R eset Pending 0-1
t3 3 phase supply removed Reset Delay 0-7200s 0s A uto R eset Exceeded 0-1
t4 Start signal must still be applied Reset Attempts 0-10 0 A uto R eset Delay Remaining 0-7200s
If it has been removed Auto Reset feature re-initialises Reset Trips All resettable trips - A uto R eset Attempts Remaining 0-10
t5 Reset delay = 0 Restart Attempt = 3 Trip Free Time 0-7200s 600s A uto R eset Trip Free Time Remaining 0-7200s
t6 Rest Signal must be low
If the trip is reset the Auto Reset feature re-initialises Notes
t7 Reset delay = 0 Restart Attempt = 2
For Two Wire control reset occurs automatically when the start signal changes state from low to high, reset shown is programmable reset input
(1)
t8 3-Phase re-established
t9 Reset delay = 0 Restart Attempt = 1
t10 Trip Free Delay = 0 Restart Attempt = 4
Reset Attempts = 4
Trip Free Time Reset Delay Reset Delay Reset Delay
Reset Attempts = 4 Reset Attempts = 3 Reset Attempts = 2 Reset Attempts = 1