Control Techniques Unidrive Installation Manual page 25

4.7.1 Control logic sequencing
Figure 4-10 shows the sequencing of the signals which must be accomplished with this
logic.
Figure 4-10 Control logic and sequencing
AC SUPPLY
SELECT
AC SUPPLY
CONTACTOR
LOW VOLTAGE
DC SUPPLY
CONTACTOR
DISCHARGE
RESISTOR
DRIVE ENABLE
SIGNAL
Unidrive SP Low Voltage DC Installation Guide
Issue Number: 1
t1
Both delays t1 & t2 should have a minimum value of 1s.
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AC SUPPLY SELECTED
DC SUPPLY SELECTED
CONTACTOR CLOSED
CONTACTOR OPEN
CONTACTOR CLOSED
CONTACTOR OPEN
t2
CONTACTOR CLOSED
CONTACTOR OPEN
DRIVE ENABLE PROVIDED
DRIVE ENABLE REMOVED
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