Rockwell Automation T6050 SurgeGard Incipient Surge-Conditioning Module - Manual (Page 32)

ICS Triplex Turbo Machinery Control
PD-6050 Dec 04 4
T6050 SurgeGard™ Benefits
Tune your application properly to obtain the T6050 SurgeGard™ benefits:
Increased Energy Savings
The addition of incipient override control permits closer operation to the actual surge point/line, thus
providing a wider operating window and saving energy by minimizing recycle/blowoff.
Identifies and Corrects for Shifts in Surge Point/Line
Incipient surge detection continuously monitors the compressor’s operating point behavior in relation
to symptoms of impending surge and allows for automatic correction of surge point/line shifts.
Prevents Compressor Trips
Minimizes the impact of primary surge control and field instrument malfunction by providing
incipient fall-back and override control. Thus, even in the event of key transmitter (such as flow)
failures, the compressor will stay on-line, increasing plant availability.
Facilitates Actual Surge Point/Line Testing
In addition to surge monitoring and override control, the incipient surge detection module facilitates
testing of actual surge points, minimizing operation interference.
Hardware Function
Hardware Block Diagram
ANALOG
INPUT
Current
or Voltage
DIFFER-
ENTIAL
AMPLIFIER
FILTER GAIN
ABSOLUTE
VALUE
PEAK
DETECTOR
VOLTAGE
TO
CURRENT
CONVERTER
ANALOG
OUTPUT
4-20mA
DC TO DC
CONVERTER
LOOP POWER
(22-32VDC)
4-20mA
TO ANTI-SURGE
CONTROLLER
CURRENT
OR VOLTAGE
FROM FLOW
TRANSMITTER
AC SIG
AC SIGNAL
OUT
Figure 4. Hardware Block Diagram