Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 28)

Chapter 4
Description of Operation
4-7
Power-Up/Down Sequence Figure 4.3 describes the various steps involved in the power-up/down
sequence of the 1391-DES Drive.
Figure 4.3
Drive Power-Up / Down Sequence
Apply AC Input Power to Isolation Transformer
a) Logic power supplies and base drive circuits
power-up.
b) Apply 115V AC to contactor.
c) Power bus charges.
d) If no faults are encountered, the DROK relay
energizes. Drive is ready to receive customer
enable signal.
Enable Signal is Applied Prior to 36V AC Power
a) When 36V AC power is applied, fault circuits detect
that the enable signal is already applied. Random
fault conditions occur.
b) Re-application of enable after resetting the drive
and with 36V AC power still present, will energize
the drive.
Enable Signal Removed
a) Motor will regenerate to a stop.
b) Output power stage is disabled.
c) DROK relay maintains a no fault status.
Fault Condition Occurs
a) Drive output stage disabled.
b) DROK relay is de-energized and a fault is
displayed.
c) If contactor (M) is wired to the DROK relay in a
stop string, contactor will open and the shunt
regulator will discharge the power bus supply.
POWER-UP SEQUENCE
AC Input Power Removed
a) Logic and DC link power supplies begin decaying to
zero volts.
b) Undervoltage (fault) condition occurs.
c) DROK relay de-energizes based on setting of
parameter 130.
POWER-DOWN SEQUENCE
Enable Signal Applied
Minimum of 100 ms after Contactor is Closed
a) Base drive enabled and will respond to velocity
command inputs.
Fault
Fault
Fault
Fault
Fault