ABB Bailey INFI 90 SPHSS13 Hydraulic Servo Module

Description

The ABB SPHSS13 hydraulic servo module is a valve position control module. It provides an interface through which a HR Series controller can drive a servo valve or I/H converter to provide manual or automatic control of a hydraulic actuator.

Typical areas of use for the SPHSS13 module are positioning the steam turbine throttle and control valves, gas turbine fuel valves, inlet guide vanes and nozzle angle. By regulating the current to the servo valve, it can initiate a change in actuator position. The hydraulic actuator can then position, for example, a gas turbine fuel valve or a steam governor valve. As the valve opens or closes, it regulates fuel or steam flow to the turbine, thus controlling the turbine speed. A linear variable differential transformer (LVDT) provides actuator position feedback to the hydraulic servo module. The SPHSS13 module interfaces to AC or DC LVDTs and can operate in Proportional – Only mode.

The SPHSS13 is an intelligent I/O device with an onboard microprocessor, memory and communication circuitry. In most applications, the SPHSS13 will work in coordination with a speed detection module (SPTPS13) to form the turbine governor system.

The SPHSS13 module can also be used with non – modulating valves (open – close) to report the valve position, without performing any actual valve control. In this type of application, the SPHSS13 replaces the functionality previously provided by the Harmony Rack previous generation module SPLPS01.

Specifications

Technical data	Details
Operating voltage	+5 VDC, ±5% at 576 mA typical +15 VDC, ±5% at 15 mA typical -15 VDC, ±5% at 12 mA typical +24 VDC, ±10% at 335 mA typical (from termination unit)
Power dissipation	2.88 W (+5 VDC) typical 0.23 W (+15 VDC) typical 0.18 W (-15 VDC) typical 8.04 W (24 VDC) typical
LVDT secondary 2 – position inputs	4 analog inputs total, 2 LVDT secondary inputs (each with 2 secondaries) 24 V<sub>o</sub> ±7 VDC common mode, 10 kΩ differential input impedance
LVDT supply primary excitation outputs	2 analog outputs: LVDT primary 1 and 2 Ambient frequency: 400 Hz to 15 kHz
Servo valve coil outputs	2 analog outputs with servo output protection. Shorting or opening 1 output does not affect the other output Servo mode: ±300 mA I/H mode: 4 – 20 mA or 20 – 160 mA
Position panel meter output	1 analog output (scaled feedback output)
Unscaled position feedback output	1 analog output
Test mode output	1 analog output
Digital inputs	3 optically isolated (250 VDC) contact inputs (raise, lower and trip bias)
Digital outputs	-1 independent, optically isolated (250 VDC), open collector output (hard manual)
Ambient temperature	0 °C to 70 °C (32 °F to 158 °F)
Dimensions	35.56 mm width, 177.80 mm height, 298.45 mm depth (1.40 in. width, 7.00 in. height, 11.75 in. depth)