Red-lion TCU User Manual download pdf (Page 18)

Valve Positioner Wiring

Units with Valve Positioner option have three output connections for

controlling the valve motor and three input connections for slidewire

feedback. The valve motor output connects to terminals labeled “Valve

Position Outputs”, terminals 1, 2 and 3. See Figure 9, Valve Positioner

Wiring for more details. Terminal 1 is the Valve motor supply common.

Terminal 2 is the Valve Close or CW output. Terminal 3 is the Valve Open or

CCW output. The valve motor common must be fused with a suitable value.

Although RC snubbers are employed inside the controller to suppress

inductive “ kicks” from the motor, it may be necessary to take further action to

reduce noise effects:

1) Use Triac Output Modules wherever possible. The Triac device

significantly reduces radiated EMI (Electromagnetic Interference).

The Triac Output Module also does not suffer from mechanical wear of the

contacts.

2) Use RC snubbers directly across the valve motor.

3) Use a separate AC supply for the valve motor.

Where possible, the valve motor control outputs and the slidewire

feedback input routing should be physically separated. Noise interference

from the outputs could couple into the slidewire feedback inputs, disrupting

proper operation.

The slidewire feedback inputs connect to the terminals labeled “ Slidewire

Feedback Inputs”. The terminal placement varies with each model, see the

controller label for the actual terminals. For Velocity mode valve control the

slidewire feedback inputs are not necessary.

In some cases, it may be desirable to have an independent valve position

indicator. Red Lion Controls Model IMD1 can be wired in parallel with the

slidewire input’s Wiper and Comm. terminals for this purpose. The

approximate 0 to 0.9 V signal can be scaled to indicate percent valve position.

Linear DC Output Wiring

Units with Linear DC output option have two terminals to output a 4 to 20

mA or 0 to 10 VDC signal. The type of Linear DC output is determined by the

model ordered. (See Ordering Information page 90, for available models.)

These terminals are labeled “4-20 mA (or 0-10 VDC) Analog Output Option,

Out+ and Out-”. The common of this output is isolated from thermocouple

common , but is not isolated from the Second Analog Input Option common.

For proper operation always keep these commons isolated.

Second Analog Input Wiring

Units with Second Analog Input option have two input terminals to receive

a 4 to 20 mA signal. These terminals are labeled “Second Input, 4-20 mA+ and

4-20 mA-”. Terminal placement varies with model. See unit label for actual

terminals. The common of this input is isolated from thermocouple common,

but is not isolated from the Linear DC Output common. For proper operation

always keep these commons isolated.

Figure 9, Valve Positioner Wiring

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 103 104

Comments to this Manuals

No comments

Red-lion TCU User Manual Page 18

Comments to this Manuals

Related products and manuals for Hardware Red-lion TCU