Belimo TRANE TAF Series, Техническая документация инструкция, Страница: 103 / 168

103
I20683 - Subject to change.
Operation
Electrical Features
General
All non-spring return actuators utilize Halomo sensorless
Brushless DC motor technology developed by Belimo. The
non-spring return actuators use this motor in conjunction with
an Application Specific Integrated Circuit (ASIC). The Halomo
ASIC provides the intelligence to provide a constant rotation
rate to prevent damage to the actuator.
Initialization
When a power source is applied the motor carries out an
initialization of the actuator. The purpose of this initialization
is to determine the mechanical angle of rotation and to adapt
the running time to the angle of rotation. When power is
applied, the internal microprocessor recognizes that the
actuator is at its full-safe position and uses this position as
the base for all of its calculations.
Brushless DC Motor Operation
The Halomo sensorless brushless DC motor spins by
reversing the poles of stationary electromagnets housed
inside rotation permanent magnets. The electromagnetic
poles are switched by a special ASIC. Unlike the conventional
DC motor, there are no brushes to wear or commutators
to foul.
Motor Position Detection
Halomo motor technology is a sensorless, brushless DC
motor. The Halomo technology eliminates the need for poten-
tiometers for positioning. The Halomo ASIC detects the spin-
ning rotor by monitoring the back EMF of the motor poles.
The ASIC counts these pulses and calculates position within
1/3 of a motor revolution.
Overload Protection
The non-spring return actuators are electronically protected
from overload at all angles of rotation by digital technology in
the ASIC. The ASIC circuitry constantly monitors the rotation
of the Brushless DC motor inside the actuator and stops the
pulsing to the motor when it senses an overload. The motor
remains energized and produces full rated torque when in
overload.
The overload filtration helps increase the actuators installed
life expectancy by filtering out unnecessary control signal
changes or end-stop pulsing while in overload. This helps
ensure that dampers are fully closed and that edge and blade
seals are always properly compressed.
Electrical Operation
Satisfied
Control Position
Satisfied
Control Position
Minimum
Control Resolution
Minimum Reversed
Control Deadband
Prior to Normal Control
75 mV
175 mV
Actuator responds to a 75 mV signal when
not changing direction from stop position.
Actuator responds to a 175 mV signal when
reversing direction from stop position.
All actuators have built-in brushless DC motors which provide better accuracy and longer service life.
Non-spring return actuators are designed with a unique non-symmetrical deadband. The actuator follows an increasing or
decreasing control signal with a 75 mV resolution. If the signal changes in the opposite direction, the actuator will not respond
until the control signal changes by 175 mV. This allows these actuators to track even the slightest deviation very accurately,
yet allowing the actuator to “wait” for a much larger change in control signal due to control signal instability.
Control Accuracy and Stability