5
YT-3400/3450 series
Explosion proof type of cables and gaskets should be used, when explosion gases are
present at the installation site.
Power should be turned off completely when opening product’s cover. When opening
the cover, ensure that there is no power remaining in any electrical parts nearby.
YT-3400 series has 2 ports for power connection. Explosion proof type wires and
packing should be used. Blind plug is required when any port is not being used.
Cable rug with surface area of more than 0.195mm
2
with M4 spring washer should be
used to connect the power.
For external ground terminal, cable rug with surface area of more than 5.5mm
2
should
be used.
2. Product Description
2.1
General
YT-3400/3450 series Smart Valve Positioner accurately controls valve stroke in response to
an input signal of 4-20mA from the controller. Built-in micro-processor optimizes the
positioner’s performance and provides unique functions such as
Auto-Calibration, PID
Control, Alarms, and HART Protocol Communications.
2.2
Main Features and Functions
LCD display enables users to monitor the positioner status.
Positioner operates normally during sudden changes in supply pressure and / or high
vibration environment.
Low air consumption level and low voltage use (8.5 V) yield to lower plant operating
costs. The YT-3400/3450 is compatible with most of controllers.
Variable orifice can be used to minimize the hunting occurrence and optimize operating
conditions.
Valve system feedback is greatly improved by the accuracy and fast response of the YT-
3400/3450.
Different valve characteristics can be adjusted – Linear, Quick Open, Equal Percentage,
and Custom which user can make 16 points characterizations.
Tight Shut – Close and Shut - Open can be set.
PID parameters can be adjusted in the field without any additional communicator.
A/M switch can be used to direct supply air to the actuator or to manually operate the
positioner or valve.
Split range 4-12mA or 12-20mA can be set.
Operating temperature is -40 ~ 85’C.
