Red-lion PCU Manuel d'utilisateur télécharger pdf (Page 2)

OPTIONS

Optional dual alarms can be configured to activate according to a variety of

actions (Absolute HI or LO, Deviation HI or LO, Band IN or OUT and Valve

Fail Detect) with adjustable hysteresis. A standby feature suppresses the output

during power-up until the process stabilizes outside the alarm region. An

optional secondary output is available (for processes that require cooling) that

provides increased control accuracy and response.

A linear 4 to 20 mA or 0 to 10 VDC output signal is available to interface

with actuators, chart recorders, indicators, or other controllers. The output signal

can be digitally scaled and selected to transmit one of the following: % output

power, measurement value, process measurement value deviation or setpoint

value. Valve Positioner and Second Analog Input Models have the adjustable

output demand dampening, output deadband and output update time parameters

to expand the versatility of the PCU to control devices.

The optional Motorized Valve Positioner directly controls the position of a

valve by the use of twin outputs (open and close) to control the direction of

motor rotation. The motor position defines the opening position of the valve.

Two control modes are possible: position control, that makes use of the

slidewire feedback signal supplied with the positioner and velocity control, in

which no slidewire feedback signal is used. Parameters are provided to adjust

the operation of the valve. These include:

- Valve activity hysteresis

- Valve update time

- Variable control dampening

- Slidewire signal fail action

- Adjustable valve position limits

The Valve Positioner PCU achieves tight process control, yet minimizes

unnecessary valve activity. An alarm event output or display alarm can be

programmed under loss of slidewire feedback or under valve fail detection.

The optional Second Analog Input (0 to 20 mA DC) can be configured as a

remote setpoint signal or as a secondary process signal. Configuration of the

second analog input as a remote setpoint signal allows ratio control, master

setpoint/multiple slave operation, and the ability to cascade the PCU with

another controller (external cascade). Configuration of the second input as a

secondary process signal allows operation as a two-process cascade controller

within a single unit (internal cascade). In either control mode, parameters are

provided to scale, configure, communicate and monitor the activity of both

analog inputs. A square law linearizer function can be used to linearize signals

derived from flow transmitters.

The optional RS485 multidrop serial communication interface provides two-

way communication between a PCU unit and other compatible equipment such

as a printer, a programmable controller, or a host computer. In multipoint

applications the address number of each unit on the line can be programmed

from zero to ninety-nine. Up to thirty-two units can be installed on a single pair

of wires. The Setpoint value, % Output Power, Setpoint Ramp Rate, etc. can be

interrogated or changed by sending the proper command code via serial

communications. Alarm output(s) may also be reset via the serial communications

interface option.

An optional Type 4X/IP65 rated bezel is available for wash down and/or dirty

environments, when properly installed. Modern surface-mount technology,

extensive testing, plus high immunity to noise interference makes the controller

extremely reliable in industrial environments.

SAFETY SUMMARY

All safety related regulations, local codes and instructions that appear in the

manual or on equipment must be observed to ensure personal safety and to

prevent damage to either the instrument or equipment connected to it. If

equipment is used in a manner not specified by the manufacturer, the protection

provided by the equipment may be impaired.

Do not use the PCU to directly command motors, valves, or other actuators

not equipped with safeguards. To do so, can be potentially harmful to persons

or equipment in the event of a fault to the unit. An independent and redundant

limit indicator with alarm outputs is strongly recommended. The indicators

should have input sensors and AC power feeds independent from other

equipment.

SPECIFICATIONS

1. DISPLAY: Dual 4-digit

Upper Process Display: 0.4" (10.2 mm) high red LED

Lower Auxiliary Display: 0.3" (7.6 mm) high green LED

Display Messages (Model dependent):

“OLOL” - Appears when measurement exceeds +105% input range.

“ULUL” - Appears when measurement exceeds -5% input range.

“SENS” - Appears when measurement exceeds “OLOL” & “ULUL”

range.

“....” - Appears when display values exceed + display range.

“-...” - Appears when display values exceed - display range.

“SLid” - Appears when loss of slidewire signal is detected.

“VALV” - Appears when valve actuator error is detected.

2. POWER: Switch selectable 115/230 VAC (+10%, -15%) no observable line

variation effect, 48 to 62 Hz, 10 VA.

3. ANNUNCIATORS:

LED Backlight Status Indicators (Model dependent):

%PW - Lower auxiliary display shows power output in (%).

DEV - Lower auxiliary display shows deviation (error)

from process setpoint.

OP1 - Main control output is active.

AL1 - Alarm #1 is active.

AL2 - Alarm #2 is active (for Dual Alarm Option).

OP2 - Secondary output is active

(for Secondary Output Option).

OPN - Valve positioner OPEN output is active

(for Valve Positioner Option).

CLS - Valve positioner CLOSE output is active

(for Valve Positioner Option).

SEC - Lower auxiliary display shows second analog input

(for Second Analog Input Option).

MAN - Flashing: Controller is in Manual control mode.

REM - ON: controller is in remote setpoint mode

(Second Analog Input Option).

- OFF: controller is in local setpoint mode

(Second Analog Input Option).

- Flashing: controller is in Manual control mode

(Second Analog Input Optional).

4. CONTROLS: Four front panel push buttons for modifying and setup of

controller functions and one external input for parameter lockout or other

functions.

5. SIGNAL INPUT:

Sample Period: 100 msec typ.

Response Time: 300 msec typ. (to within 99% of final value w/step input)

Signal Overdrive Threshold:

10 V Range: 13 V typ.

20 mA Range: 26 mA typ.

Signal Overdrive Response:

Main Control Output: Programmable preset output

Display: “SENS”

Alarms: Upscale drive

DC Linear: Programmable preset output

Normal Mode Rejection: 40 dB typ. @ 50/60 Hz (improves with increased

digital filtering).

Common Mode Rejection: 100 dB typ., DC to 60 Hz

Protection: Input overload 120 VAC for 30 seconds.

Range And Accuracy:

SIGNAL RANGE

ACCURACY (% OF

UNSCALED

READING)

MAXIMUM

INPUT

IMPEDANCE

RESOLUTION

0 to 10 VDC ±(0.15% + 3 mV) 300 VDC 1M Ω 10 mV

0 to 20 mADC ±(0.15% + 6 µA) 200 mADC 10 Ω 10 µA

6. OUTPUT MODULES [Optional] (For All Output Channels):

Relay:

Type: Form-C (Form-A with some models. See Ordering Information.)

Rating: 5 Amps @ 120/240 VAC or 28 VDC (resistive load), 1/8 HP @

120 VAC (inductive load) max.

Life Expectancy: 100,000 cycles at max. load rating. (Decreasing load

and/or increasing cycle time, increases life expectancy).

Logic/SSR Drive: Can drive multiple SSR Power Units.

Type: Non-isolated switched DC, 12 VDC typ.

Drive: 45 mA max.

Triac:

Type: Isolated, Zero Crossing Detection

Rating:

Voltage: 120/240 VAC

Max. Load Current: 1 Amp @ 35°C

0.75 Amp @ 50°C

Min. Load Current: 10 mA

Off State Leakage Current: 7 mA max. @ 60 Hz

Operating Frequency: 20 to 400 Hz

Protection: Internal Transient Snubber, Fused

7. MAIN CONTROL OUTPUT:

Control: PID or ON/OFF

Output: Time proportioning or linear DC

Hardware: Plug-in, replaceable output modules

Cycle time: Programmable

Auto-tune: When selected, sets proportional band, integral time, and

derivative time values.

Signal Overdrive Action: Programmable

1 2 3 4 5 6 7 8

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Red-lion PCU Manuel d'utilisateur Page 2

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