Siemens 420 manual Automatic restart, Line undervoltage brownout, Line failure blackout

Issue 07/04 3 Functions

3.15Automatic restart

Parameter range:	P1210
	P1211
Warnings	A0571
Faults	F0035
Function chart number:	-

After a power failure (F0003 "Undervoltage"), the "Automatic restart" function (enabled using P1210) automatically powers-up the drive inverter again. Any faults are automatically acknowledged by the drive inverter.

When it comes to power failures (line supply failure), then a differentiation is made between the following conditions:

Line undervoltage (brownout)

"Line undervoltage" is a situation where the line supply is interrupted and returns before (if installed) the BOP display has gone dark (this is an extremely short line supply interruption where the DC link hasn't completely collapsed).

Line failure (blackout)

"Line failure" is a situation where the display has gone dark (this represents a longer line supply interruption where the DC link has completely collapsed) before the line supply returns.

The automatic restart function P1210 is shown in the following diagram (refer to Table 3-22) as a function of external states / events.

Table 3-22 Automatic restarts

P1210		ON always active (permanent)			ON in no-voltage condition
	Fault F0003 on		All other faults on		All faults on	No faults on
	Blackout	Brownout	Blackout	Brownout	Blackout		Blackout
0	−	−	−	−	−		−
1	Fault acknowl.	−	Fault acknowl.	−	Fault acknowl.		−
2	Fault acknowl.	−	−	−
	+				−		Restart
	restart
3	Fault acknowl.	Fault acknowl.	Fault acknowl.	Fault acknowl.	Fault acknowl.		−
	+	+	+	+	+
	restart	restart	restart	restart	restart
4	Fault acknowl.	Fault acknowl.	−	−	−		−
	+	+
	restart	restart
5	Fault acknowl.	−	Fault acknowl.	−	Fault acknowl.
	+		+		+		Restart
	restart		restart		restart
6	Fault acknowl.	Fault acknowl.	Fault acknowl.	Fault acknowl.	Fault acknowl.		Restart
	+	+	+	+	+
	restart	restart	restart	restart	restart

MICROMASTER 420	Operating Instructions
6SE6400-5AA00-0BP0	127