Description

Spirax Sarco SX90 is a panel mounted 1/8th DIN controller, suitable for constant set point control of systems having fixed pre-programmed set points. The controller has universal inputs, and outputs using PID for close control of industrial processes. The SX90 controller is for use with the Spirax Sarco range of pneumatic and electric control valves and electrical and electropneumatic instruments.

Replacement Product

The SX90 series has been superseded by the new GS-X2 programmable process controller, which provides advanced features in a modern package.

Product Features

• Universal Input: Resistance thermometers, thermocouples, mA and mV
• Universal Output: VMD (valve motor drive), mA and voltage for continuous (split range function), relay and logic for switching control
• Auxiliary Power Supply: For external transmitter requiring 24 Vdc
• Set Point: The SX90 can operate with local set point, remote set point, or a choice of 4 set points can be selected
• Ramps: There are 2 independent ramps (ramp up and ramp down) for rate of change from one set point to another
• Remote Set Point: For cascade control (master/slave) using 2 controllers working together, or to remotely control the set point
• Retransmission: For retransmission of the process value, set value, or as second analogue output
• Event Alarm: 4 programmable relay outputs for deviation, band, and process alarms
• Quick Codes: 5-digit quick codes enable easy set-up and commissioning of the controllers
• Serial Communications: For connecting via a serial port RS485 (5 wire), up to 64 controllers into a supervisory system
• Auto/Man: The automatic to manual mode can be changed via the key board, or logic inputs
• Logic Inputs: 3 logic inputs to provide a variety of selectable functions
• Potentiometer Input: For feedback of valve position
• Text Messages: Scrolling text messages can be configured to alert the user to process conditions
• Forced Output: Forced output level defined by instrument parameter and activated by a logic input or by writing to the parameter
• Split Range Function: Can work with 2 valves (split range). Please note that this function is only available if the SX90 is running the 1.05 software or newer (the software version on your unit will be displayed during start-up).

Approvals

These controllers conform to the Council Directive 93/68/EEC and the regulations on the essential protection requirements in Electrical Apparatus EN 61010-1:90.

• EMC Emissions Specification: EN 61326-1: 1997 Class B (including amendments A1, A2 and A3)
• EMC Immunity Specification: EN 61326-1: 1997 Industrial locations (including amendments A1, A2 and A3)

Dimensions (Approximate) in mm

Technical Data

General Details

Parameter	Value
Mounting arrangement	Panel mounted 1/8 DIN
Power supply	85-265 Vac, 9 W maximum
Electrical connections	Screw connection terminal block
Panel sealing	IP65 - plug in from front panel, NEMA 4X
Operating temperature/humidity	0 to 55°C, 5 to 85% RH
Atmospheres	Not suitable for use in explosive or corrosive atmospheres
Electromagnetic compatibility (EMC)	EN 61326
Electrical safety BS EN 61010	Installation Category II
Weight	350g
Approvals	CE

Process Variable Inputs

Parameter	Value
Calibration accuracy	< ±0.25% reading ±1 LSD
Resolution	< 0.5 μV with 1.6 second filter
Input filter	Off to 59.9 seconds
RTD	3 wire Pt100 DIN 43760
Bulb current	0.2 mA
Universal linear mA	4-20 mA, 0-20 mA, using external shunt resistor 2.49 Ω
Linear input range	-10 to 80 mV
Thermocouples	K, J, N, R, S, B, L, T, C, custom
Sampling rate	4 Hz (250 ms)
Cold junction accuracy	< ±1°C at 25°C ambient
Accuracy linear mA	< 0.1% reading
Input impedance	100 MΩ
Number of set points	3 plus remote set point
User calibration	2 point gain and offset

Transmitter Power Supply

Parameter	Value
Isolation	300 Vac double isolated
Output voltage	18V ±15%
Current	30 mA maximum
Load regulation	< 1 V over 25 mA

Control Action

Parameter	Value
Proportional band	1-9999 Engineering units or 0.01 to 300% or 0.1-3000
Integral time	Off - 9999
Derivative time	Off - 9999
Error band	One shot tune, or natural frequency tune. The controller will automatically select the best method according to the process conditions
Auto tuning	Hysteresis from 0.01 to 300.0 or 0.1 to 3000 Engineering units
On-Off control	1-9999 Engineering units or 0.01 to 300% or 0.1-3000
Cut back	To minimise overshoot on critical processes
Auto/Manual modes	Selectable from keyboard
Split range	2 parameters that give: The full opened valve 1 and The start-up valve 2

Relay Outputs

Parameter	Value
Isolation	300 Vac double insulated

Logic Inputs (x3)

Parameter	Value
Contact closure	Open > 1200 Ω, Closed < 300 Ω

Comms

Parameter	Value
Isolation	300 Vac double isolation
Hardware	EIA 485 5 wire (EIA 422 compatible)
Protocol	Modbus RTU slave

Remote Set Point Input

Parameter	Value
Isolation	300 Vac double isolation
Calibration accuracy	< ±0.25% reading ±1 LSD
Sampling rate	4 Hz (250 ms)
Resolution	> 14 bits - 0.5 mV for 0-10 V input, 2 μA for 4-20 mA
Input impedance	> 222 kΩ (Volts) 2.49 Ω (Current)
Linear input range	0-10V, 0-20 mA
Input filter	Off to 59.9 seconds
Zero offset	User adjustable over full range
User calibration	2 point gain and offset

Pot Input

Parameter	Value
Pot resistance range	100-10 kΩ
Excitation voltage	0.46-0.54 V
Resolution	0.006% of Span (> 14 Bits)
Sample rate	1 Hz
Short circuit pot detection	< 25 Ω
Open circuit pot detection	> 2 MΩ
Open circuit wiper detection	> 5 MΩ
Contact rating	Maximum 2 A @ 264 Vac resistive

Note: Maximum 2 A per terminal limit applies where relays have common terminals. (2 amps maximum for terminal AB)

Outputs

Output	Description
Output 1	SPST N/O contact
Output 2	0-20 mA, 4-20 mA, 300 Vac double insulated, 13.5 bits resolution (< 550 Ω)
Output 3	0-20 mA, 4-20 mA, 300 Vac double insulated, 13.5 bits resolution (< 550 Ω)
Output 4	Changeover relay contacts
Outputs 5 and 6 (VMD)	2 SPST interlocked N/O relays

Wiring Diagrams

Safety Warning

Safe operation of this product can only be guaranteed if it is properly installed, commissioned, used and maintained by qualified personnel as stated in the IMI supplied with the unit. It is the duty of the Company Safety Officer to ensure that the product specific data and Safety information within the supplied IMI has been fully understood and complied with.

How to Order

Example: 1 off Spirax Sarco SX90 process controller.