Hansen MCV User Manual

31
R649c
SEPTEMBER 2018
PXVC-T (TEMPERATURE) CONTROL
The Hansen PXVC-T Controller is factory programmed to
provide precise control of temperature in applications
such as Liquid Injection of screw compressors. A
temperature sensor, included, provides an input to the
Hansen PXVC-T controller which controls the Hansen
Motorized Control Valve. The valve modulates the
refrigerant flow necessary to maintain a set for discharge
gas temperature.
PXVC-L (LEVEL) CONTROL OF
FLOODED EVAPORATORS
The Hansen PXVC-L Controller is factory programmed
to provide precise control of liquid level in flooded
evaporators, small liquid recirculators, and other
refrigerant level vessels. A 4-20 mA input signal
from the Hansen VLT level probe, Hansen Vari-Level
with 4-20 mA, or other liquid level device to the
Hansen PXVC-L controller which controls the Hansen
Motorized Control Valve. The valve modulates the
refrigerant flow necessary to maintain a set-for liquid
level in the vessel.
PXVC-DX CONTROL OF EVAPORATOR
The Hansen PXVC-DX Controller is used with system
temperatures less than -20°F (-28.9°C). It is factor
programmed to provide precise control of the Hansen
Motorized Control Valve for direct expansion evaporators.
A 4-20mA input signal from the Hansen HPT superheat
sensor or computer output of superheat to the PXVC-DX
controller which controls the Hansen Motorized Control
Valve. The valve modulates the refrigerant flow necessary
to maintain a set superheat setpoint.
PXVC-P (PRESSURE) CONTROL
The Hansen PXVC-P Controller is factory programmed
to provide precise control of pressure in applications
such as hot gas bypass to suction of a compressor. A
pressure transducer, available from Hansen, provides
an input to the Hansen PXVC-P controller which controls
the Hansen Motorized Control Valve. The valve modulates
the refrigerant flow necessary to maintain a set for
pressure.
SELECTION OF SENSORS
Temperature Probe (Included)
• TS1, temperature sensor, NTC10K, length 2 inches
with 6.5 feet cable
• IMW, temperature probe immersion well, length 4"
Pressure Transducer (Available)
• PT2, pressure transducer, -14.7–85 psig, 24VDC,
4-20mA output
• PT3 pressure transducer, -14.7–285 psig, 24VDC,
4-20mA output (Factory Default)
Subheat/Subcooling
• Hansen HPT
Level Control
• Hansen VLT probe or similar
SELECTION OF CONTROL VALVES
Motorized Valves
• Hansen MCR, MCV, MCXV
POWER FAILURE
Upon power-interruption, all parameters and set-points
are memorized in non-volatile memory, and therefore do
not have to be re-entered
ERROR MESSAGES
Err1: Temperature sensor faulty or missing.
Err3: Parameter error; check the input parameter
settings.
Err4: Failure of an internal component required for
operation. Product must be replaced.
ELECTRICAL CONNECTIONS
In an extremely impaired EMC environment use only
shielded cables for input/output connections.
Use safety insulating transformers with double
insulation; they must be designed for 100% ON-time.
RAMP UP DELAY
Ramp up delay provides a soft start control at startup.
The active state is shown by the clock symbol on the
display. At power-up or going from closed to open
contacts on the INTERLOCK input, the controller will
operate in “RAMP UP DELAY” mode for 2 minutes
(default) or a predefined time (IL27 not equal to zero).
During the countdown, the P-band is doubled and the
KI-bands are halved resulting in a slower control
response.
HANSEN CONTROLLERS

Hansen MCV Specifications

General

Brand	Hansen
Model	MCV
Category	Control Unit
Language	English