I-E96-315B
Preface
The Hydraulic Servo Slave Module (IMHSS02) is a position con-
trol module. It interfaces a servo valve to the Multi-Function
Processor (IMMFP01/02/03) or Multi-Function Controller
(IMMFC03/04/05). The MFP or MFC controls the position of a
steam or gas turbine throttle valve by sending a position
demand to the HSS. The HSS drives its outputs to open or
close the throttle valve to match the position demand. The MFP
or MFC uses the Frequency Counter Slave (IMFCS01) to mea-
sure the turbine speed. The FCS measures turbine speed by
counting and timing pulses from a magnetic pickup on the tur-
bine shaft. The controller or processor module uses this count
to calculate turbine speed and calculate a new demand based
on a setpoint.
The IMHSS02 is a compatible replacement of the IMHSS01.
This manual provides the user with information and instruc-
tions for installation, operation and troubleshooting of the
HSS. Anyone involved with the installation and operation of the
hydraulic servo slave should carefully read and understand
this manual.
General information about the module and related equipment
is contained herein. This manual is not an application guide.
