Actuator exchange in case
of compressors
Background
Scopes of supply (see figures 1–3)
In compressor operation, requirements
as to the reliability of actuators increase.
The actuators trigger the Inlet Guide Vanes
(IGV), thus adjusting media flow rates.
Control unit
In the past various types of failures occurred
with actuators:
leakages at diverse connections
corrosion damages
increased vibrations at electronic
components
pressure switch
explosion protection (upon request)
two control circuits for controlling two
operating cylinders (dependent upon
actuator size)
automatic control using SIPART PS2
controller
terminal strip
self ventilation of control unit
transducer failures
Improvements
In order to increase the IGV’s availability
a new actuator was designed, eliminating
the disadvantages of the existing type.
It has been modified as follows:
Pneumatic and electronic drive and
control components are separated from
each other to avoid vibration damages
of the electronics.
Leakages with seals and pipe fittings are
avoided by use of modified types.
An innovative, contactless position
measuring system with magnetostrictive
position sensors avoids contact damages.
Magnetic position sensors allow for
an uncorrected linearity tolerance of
+/- 0.02 % and a measurement repeat
accuracy of 0.001 %. This is possible with
no other position measuring system.
The rugged design is particularly suitable
for continuous operation.
Answers for energy.
Operating cylinder
explosion protection (upon request)
reinforced hose 2 x 3 m, 2 x 1.5 m
(from DS 160 3 x 3 m and 3 x 1.5 m,
respectively)
joint head
fork head
control unit support (with sealing plate)
The package additionally includes reinforced hoses with 3/8-NPT external threads.
Furthermore, control units are supplied
with aluminum brackets that may be
mounted on a base either by doweling or
by welding.
machine
reinforced hose
length 3.00 m
control unit
reinforced hose
length 1.50 m
customer‘s pipe
third reinforced hose
from DN 160
reinforced hose connections
3/8-NPT-outside thread
Figure 1: schematic connection diagram
Seal Gas
Booster
control cabinet
pneumatic control
positioner
SIPART PS2
filter governor
Figure 2: circuit diagram of actuators with SIPART
PS2-controller
Installation period
Published by and copyright © 2008:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Power Generation, Inc.
4400 Alafaya Trail
Orlando, FL 32826-2399, USA
The actuator is delivered as an assembled
unit including panel and can be installed
during a short shutdown period within one
or two working days.
Customer benefits
For more information, contact our
Customer Support Center.
Phone:+49 180/524 70 00
Fax: +49 180/524 24 71
(Charges depending on provider)
e-mail: support.energy@siemens.com
www.siemens.com/energy-support
low maintenance
Order No. A96001-G90-B174-X-4A00
Printed in Germany
1386 J DA 0308 1.
fast assembly of components due to
simple interchangeability
All rights reserved.
Subject to change without prior notice.
Printed on paper treated with chlorinefree bleach.
Trademarks mentioned in this document are the property of Siemens AG,
its affiliates, or their respective owners.
The information in this document
contains general descriptions of the
technical options available, which may
not apply in all cases. The required
technical options should therefore be
specified in the contract.
high operational safety
high reliability
non-contact position measuring system
Figure 3: control unit with SIPART PS2-controller