Introduction - WEST P8700 User Manual

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/ -DIN, / -DIN & / - DIN Controllers & Indicators - Product Manual
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1 Introduction

These instruments are microprocessor based indicators, process controllers, indicators, and
profilers. They can measure, display or control process variables such as temperature,
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pressure, flow and level from a variety of inputs. Models are available in three sizes. / DIN
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(48 x 48mm front). / DIN (48 x 96mm front) and / DIN (96 x 96mm front).
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The operating voltage is either 100-240V at 50/60 Hz or 24V-48V AC/DC depending on the
model purchased. EEPROM technology protects against data or configuration loss during
power outages.
Inputs are user configurable for connection to thermocouple and RTD probes, as well as
linear process signal types such as mVDC, VDC or mADC. Output options include relays,
SSR drivers, triacs or linear mV/voltage modules. These can be used for process control,
alarms or retransmission of the process variable or setpoint to external devices such as data
recorders or PLC's. A Transmitter Power Supply option module can provide an unregulated
24V DC (22mA) auxiliary output voltage for external signal transmitters.
Alarm indication is standard on all instruments; up to five alarms are possible on the
indicators. Alarms may be set as process high or low, deviation (active above or below
controller setpoint), band (active both above and below setpoint), or control loop types.
Models with a heater current input also have high, low or short circuit heater break alarms
based on control load current. These alarms can be linked to any suitable output. Alarm
status is indicated by LED's or the alarm status screen.
Controllers can be programmed for on-off, time proportioning, or current proportioning control
implementations, depending on the output modules fitted, and feature manual or automatic
tuning of the PID parameters. A secondary control output is available when additonal output
modules are fitted. Valve Motor Drive (VMD) is also possible on some models. Controllers
with analogue Remote Setpoint inputs and Profile Controllers are included in the range.
Control functions, alarm settings and other parameters are easily adjusted from the front
keypad or via PC based configuration software.
Limit Controllers shut down a process in order to prevent possible damage to equipment or
products. They have latching relay, which cannot be reset until the process is in a safe
condition. Limit controllers work independently of the normal process controller and have
approvals for safety critical applications.
Indicator models can display a process value and provide multiple stage alarm outputs.
Additional features include Multipoint scaling to compensate for non-linear signals and a Tare
function to auto-zero the current reading.
Page 2 Introduction 59305-5, Issue 5 – March 2005