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Quattro DC Drive Operation and Feature Overview
there will be no timed delay for current ramp-
down. This time may be adjusted by the
function RAMPED STOP TIME (A1).
Over-Speed Test
A reference speed multiplier is provided to help
testing of the elevator governor over-speed
trip. This feature will automatically return to
normal at the completion of each elevator run.
However, to ensure that the drive Over-Speed
Trip does not interfere with the governor test,
one must temporarily raise the value set for the
Drive Over-Speed Trip point to a value higher
than that of the governor.
Motor Field Current Control and Field
weakening
DC elevator motors have a separately excited
shunt field. Adjustments include Stand-By
Current, Full-Field Current and Weak-Field
Current, all programmed in amperes, and a
Flux Confirm Level, programmed as a % of
Full-Field. With no active Full-Field or drive
Run command motor field current would
normally be at Stand-By amps. An active
command to provide Full Field causes field
current to increase to the Full Field setting.
When Field current is greater than the Full-
Field threshold setting (and there are no other
faults) the DC motor contactor will be enabled
to pull in when told to do so by an active drive
Run command. When the motor contactor is
acknowledged as being closed, the motor
armature current regulator is released to follow
the commanded torque reference current
signal. Motor field current will remain at the
Full-Field value as long as the per unit (pu)
reference or measured speed (whichever is
greater) is less than the pu ratio of WF/FF
amps. Above that speed motor field current
will automatically follow the constant CEMF
profile of WF/FF X 1/spd, where speed is again
the greater active value of reference or
measured speed. When motor speed reduces
from high speed, motor field current
automatically increases according to the
constant CEMF calculated profile. However,
field current will not increase to be more than
the Full field ampere setting.
Fault & Alarm Reset
An external Fault Reset command signal from
the car controller may be applied to a logic
input or from a serial command link. Or, an
automatic Fault Reset will occur 5 seconds
after a drive fault occurs, when enabled to do
so. Either method may be used to enable the
car controller to quickly recover from a re-
settable fault. One Fault will be subtracted
from a fault count accumulation every 20
minutes. The maximum number of Auto-
Resets that can be accumulated is 5. The
Auto-Reset function will then require a power
Off/On cycle in order to recover. Faults &
Alarms may also be cleared by use of the
Magnetek Operator.
Electronic Motor Over-Load
An electronic motor over-load function is
provided to take the place of heater type power
components. Motor armature current is
continuously monitored and the heating effect
is calculated over time. A motor overload trip
will not automatically stop the drive, but is an
important alarm signal to elevator car controller
to help prevent equipment damage.
Armature Voltage Feedback
DSPR
This is a temporary ‘construction’ or trial mode
for proving out direction orientation of the
motor and operation of the encoder. Motor
speed regulation is controlled by armature
voltage feedback with IR compensation.
Precise speed regulation is not possible.
Operation above base speed of the motor is
not possible since the field weakening is
inhibited. However, it is still possible to
monitor the feedback from the encoder
although it will not used for speed regulation.
Successful operation in this mode may require
reduced gain settings. This is selectable by
setting SPD REG TYPE (C1) to CEMF REG.
While the drive is idle with Stand-By Current
being applied to the motor field, a second timer
for Drive Stand-by Power Reduction (DSPR)
will be running. When/If the DPSR timer
times-out, motor field current will turn
completely Off and the main 3-phase power to
the drive will be removed. This helps save
electrical energy during long periods of non-
use. Recovery of this condition will be
automatic upon the receipt of the next “Full-
Field” or “Run” command. At that time,
recovery from a DSPR power OFF condition
may take several seconds. DSPR TIME can
be set in the Drive A1 Submenu.
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