Configuration
Function blocks
Internal motor control with V/f characteristic control (MCTRL1)
8
8.2
8.2.6
8.2-38
EDSVF9333V EN 3.0-06/2005
Flying restart circuit with protection against unexpected start-up
(C0142 = 2):
0
1
2
3
4
9300vec087
Fig. 8.2-16 Signal characteristic for manual start with flying restart circuit (C0142 = 2)
Speed setpoint (e.g. AIN-OUT)
Actual speed value
Fault (e.g. DCTRL-FAIL = HIGH)
Pulse inhibit (e.g. DCTRL-IMP = HIGH)
Enable controller (e.g. X5/28 = HIGH)
c The motor rotates with setpoint
d A fault (e.g. mains failure, TRIP SET) activates a pulse inhibit .Themotor
coasts. After eliminating the fault (e.g. mains recovery, TRIP RESET) the pulse
inhibit remains active until the controller is enabled again (e.g. LOW-HIGH
edge at X5/28)
Important in case of an OU message: if the OU message is not pending
anymore, the pulse inhibit is deactivated.
e The flying restart circuit is active now and determines the current motor
speed
f The m otor is accelerated along the set acceleration ramp to the speed
setpoint and is being kept there
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