DRIVE SETUP AND ADJUSTMENT
48
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.
External/Auto Fault Reset
An external Fault Reset command signal from
the car controller may be applied to logic input
A1TB1-49. Or, an automatic Fault Reset will
occur 5 seconds after a drive fault occurs, if
enabled by function 101. This will 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 manual
intervention.
Over-Speed Test
Two adjustment functions are provided to help
testing of the elevator governor over-speed
trip. Function 81 defines a reference
multiplier value. Logic function 80 turns the
effect of that multiplier on and off. However,
be aware that the Drive Over-Speed trip fault
F97, set by function 12, is a fixed percent of
rated rpm and will also be tested, and indeed
should trip. To ensure that the drive Over-
Speed Trip does not interfere with the
governor test, one must temporarily raise the
value set in function 12 to be above the trip
speed of the governor.
Anti-Rollback (ARB)
When enabled, the drive will utilize a position /
velocity regulator to combat elevator rollback
on starting and during re-leveling. See
descriptions for functions 130 through 133.
Drive Standby Power Reduction
(DSPR)
Drive turns off 3-phase power to the
transformer during periods of non-use to save
energy. See descriptions functions 88 and
184.
Brake Control Logic
Two programmable logic outputs control
external power relays. The Brake Lift output
will indicate when the drive is holding the car
and the elevator brake should be released
(lifted and held). The timed Brake Pick output
is intended to assist lifting of the brake.
Removal of the drive Run logic command will
cause the drive to go to zero speed and hold
the car for an adjustable time while the brake
is dropped (set). Motor current ramp-down
will be delayed until after the brake has
dropped. See descriptions for adjustments
#89, 90, 91, & 92.
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