Quattro DC Drive Sequencing
31
Drive Sequencing
NORMAL operating sequence
1. Motor field current is at Stand-By during
drive idle. The No Faults relay is active.
Full-Field and Run command signals are
OFF. Motor contactor Safety circuits may
be open or closed. The DC bus will
remain charged with regulated voltage as
long as the drive is providing motor field
current.
2. A Field Enable Command, programmable
by FLD ENA SRC (C1), is sent to the
drive. If the DC bus is not pre-charged, a
pre-charge cycle will be completed before
motor field current is restored. See
Quattro Pre-Charge on page 32 for timing
information of the Pre-Charge circuit.
Motor field current will go to the Full-Field
value in preparation to produce motor
torque. Flux Confirm will become active
when motor field current rises above the
Flux Cnfrm Level (A6).
3. Pre-Torque command value is sent to the
drive. It must be available before a Run
command is given. If the Pre-Torque
Latch is used, see Pre-Torque Latch (C1),
it can be placed inactive depending on the
settings of Pre-Torque Latch Clk (C1). If
latching is not used, it must remain active
until the SPD REG RLS output is active.
Safety circuit relays are closed making
power available to the contactor coil
circuit.
4. The motor contactor will be told to close
when motor field current rises above the Flux
Confirm threshold and there are valid Enable
and Run commands with no drive Faults. Once
the contactor is confirmed to be closed,
regulators are released, always starting with
the velocity reference at zero speed and motor
current at pre-torque amperes.
5. The drive will activate elevator Brake relays,
if programmed to do so (or the car controller
does it externally).
6. Once the Brake is confirmed to be released
(by feedback or timer) the internal Speed
Reference will be released and the drive will
follow the external or internal velocity profile
via the programmed accel/decel rate as
programmed during the remainder of the
elevator run cycle.
7. When at the next landing...the Drive (or car
controller) de-activates elevator Brake. After
the Brake has set, the Run command is
removed causing...
8. The reference speed to be clamped to zero
and motor torque to ramp down to aero.
9. When torque ramp-down is complete the
contactor will be told to open.
10. While idle, motor field current reference will
drop to Stand-By, after the Full-Field timer
expires. Safety circuit relays may (or may not)
open to remove contactor-actuating power. A
DSPR time-out may occur while field current is
at stand-by. In that case motor field current
goes to zero and the AC main power contactor
to the drive is opened. A pre-charge cycle and
power on recovery will occur on the next
command to re-establish motor field current.
Safety Chain
Drive Enable
Stndy Fld
Motor Field
Full Fld
Run
Field Enable
Pre-Torque
Run
CONTACT
CFRM (input)
SPD REG RLS
(output)
FLUX CFRM
(logic output)
SPD REG RLS (logic output)
Run
Brake Relay
Torque
Motor Contactor
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