Automatic Restart - Siemens 6RA7086-6KS22 Operating Instructions Manual

05.05
9.17

Automatic restart

The "Automatic restart" function is controlled by the setting in parameter P086:
P086 = 0
P086 = 0.1s to 2.0s
The purpose of the "Automatic restart" function is to prevent the SIMOREG converter from switching
immediately to the "FAULT" state, but allow it to return to the "Run" state after the elimination of
certain fault conditions such as brief failures in supply voltages, brief undervoltage or overvoltage, very
high or very low line frequencies or in the case of an excessive deviation between the field current
actual value and setpoint.
The appropriate fault message is output only if one of the following fault conditions prevails
continuously for longer than the "Automatic restart time" set in P086 (maximum time delay within
which fault condition must be eliminated for "Automatic restart"):
F001 Failure of electronics supply in operation (5U1, 5W1)
F004 Armature supply phase failure (1U1, 1V1, 1W1)
F005 Fault in field circuit (field supply phase failure (3U1, 3W1) or
I
field act
F006 Undervoltage (armature or field supply)
F007 Overvoltage (armature or field supply)
F008 Line frequency (armature or field supply) less than 45Hz
F009 Line frequency (armature or field supply) greater than 65 Hz
When one of the fault conditions associated with faults F003 to F006, F008, F009 is active and the
automatic restart time delay is still running, the converter dwells in operating state 04.0 (with armature
line voltage faults) or 05.0 (with field line voltage or field current faults).
Failures in the electronics supply lasting up to several 100 ms are bridged by the back-up power
supply. With longer failures, the failure time is measured by measuring the voltage across one
"discharge capacitor" and, if the failure has not lasted as long as the "Restart time" set in P086, the
converter restarted again immediately provided that the corresponding control signals (e.g. "Switch-
on", "Operating enable") are still applied.
When the "Switch-on", "Shutdown" and "Crawl" functions are edge-triggered (see P445 = 1), the
converter cannot be restarted automatically after the power supply backup has been used.
9.18 Field reversal
By reversing the current polarity in the field winding of the DC motor (i.e. through field reversal), a
drive which incorporates a 6RA70 single-quadrant converter (with only a single armature conduction
direction) will be able to operate in other quadrants of the speed/torque characteristic (reversal of
rotational direction and braking). Two contactors in the field circuit (1, 2) are required to reverse the
polarity of the field voltage.
The signal level of binectors B0260 ("Close field contactor 1") and B0261 ("Close field contactor 2")
are defined in an internal operating sequence involving functions "Direction of rotation reversal using
field reversal" and "Braking with field reversal". These binectors are used to control the two reversing
contactors for changing the field polarity. A snubber circuit must be installed in the field circuit.
Level of B0260:
Level of B0261:
SIEMENS AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
No automatic restart
"Automatic restart" in seconds
< 50% I )
field set
(also refer to Section 8 "Function diagrams" Sheet G200)
0 No contactor control
1 Control for one contactor for switching through positive field direction.
0 No contactor control
1 Control for one contactor for switching through negative field direction.
Function descriptions
9-75