CDHF-SVU01C-EN
64
Control System
Components
Unit mounted devices
Vane Actuator Control
The Stepper Module within the
stepper vane actuator (4M2) (and 4M4
extended capacity) pulses a DC
voltage to the windings of the
Stepper Motor Actuator(s) to control
inlet guide vane position. While
operation of this stepper motor is
automatic, manual control is
possible by going to the Mode
Overrides settings menu within the
DynaView™. Compressor Control
Signal allow the operator to manually
increase or decrease the compressor
load by adjusting the compressor
control signal.
Note: If the chiller is operating in a
limit mode (current limit, condenser
limit, evaporator limit, etcetera.) The
limit operation has priority over all
DynaView™ manual modes of
operation.
On each UCP power-up, the inlet
guide vanes are driven full closed to
recalibrate the zero position (Steps)
of the Stepper motor vane actuator.
Temperature sensors,
Evaporator sensors 4R6 and 4R7, and
condenser sensors 4R8, 4R9 entering
and leaving, bearing temperature
sensors 4R1, 4R2, oil temperature
sensor 4R5, outdoor air temperature
4R13, and evaporator 4R10 and
condenser 4R11 saturated refrigerant
temperature sensors.
Probe Operating Temperature Range -
40 to 250°F (-40 to 121oC)
Accuracy +/- 0.25oC over the range -4
to 122°F (-20 to 50oC), +/- 0.50oC over
the range -40 to 250°F (-40 to 121oC)
Power and Communications and
Terminations Power 24 +/- 10% VDC,
20 mA maximum.
Trane IPC3 protocol
Communications.
Pressure sensors
Oil tank sump 4R4 and oil pump
discharge 4R3, evaporator and
condenser refrigerant pressure 4R22,
Working Pressure Range: 0 to 50 Psia
Accuracy: ± 0.3% of full scale output
at 68°F (20°C)
Power and Communications and
Terminations
Power 24 +/- 10% VDC, 20 mA
maximum.
Communications, RS485 Physical
Layer, 19.2 Kbaud, Trane IPC3
protocol.
Starter Module
In the hierarchy of modules the
Starter module 2A1 (1A23 when
customer supplied starter specified)
is second only to the DynaView™.
The starter module is present in all
starter selections (except AFD) .This
includes Wye Delta, Across the Line,
Solid State whether remote unit
mounted or supplied by others. The
starter module provides the logic to
provide the motor protection for
Current overload, phase reversal,
phase loss, phase imbalance, and
momentary power loss. These
functions are discussed in the motor
protection section of this manual.
EarthWise™ Purge
Trane has also revolutionized its
controller-integrated purge, which
features an automatic regeneration
system for high-efficiency,
maintenance-free refrigerant
containment. Air and
noncondensables are pumped out
faster, and the lower temperature
refrigeration system enhances the
base purge efficiency. See EarthWise
purge operation and maintenance
manual for details.
Unit-mounted medium - voltage
starter
Take advantage of Tracer CH530’s
new starter and save space in your
equipment room. There is no need
for a remote or floor-mounted starter
with our new, exclusive unit-
mounted medium - voltage starter
from Cutler-Hammer.
The following two figures illustrate
the typical location of various
standard and optional unit mounted
control and sensor devices.