Harmac Pacific
Steam Turbine Control System

PMC worked with Interpro to retrofit this Steam Turbine Control System.   Components included in the system are:

• System mimic panel
• Drop in plate with a Type 8421 Universal Display and Control Panel and a Woodward 505 Turbine Control all pre-wired to terminals
• Dual redundant power supplies
• Final servo drivers

Other steam turbine control systems

• Color mimic
• Color mimic
• Black and white mimic

Governor Sales and Service

Final Servo Driver

Type 8500-1100

The PMC Type 8500-1100 Final Servo Driver is a closed loop controller that is designed to drive signals to a servo valve for positioning hydraulic actuators.  It uses a 4-20 mA signal for position command and an LVDT signal for position feedback.

FEATURES

• over / under current failure detection alarm contact with a feature that drives the actuator to zero on failures
• non follow up alarm contact output with adjustable set point and time delay
• actuator position output for driving remote indicators
• actuator error output for driving remote indicators
• adjustable zero, span and stability adjustments
• force actuator to minimum and maximum position switches for calibration
• feedback options:
  • half bridge LVDT
  • full bridge LVDT
  • 4-20 mA
• 500 V isolated input power supply feeds

SPECIFICATIONS:

Supply:

• nominal 24 VDC, range 15 to 38 VDC
• reverse and over voltage protection to 120 VAC
• ¼ A quiescent, ½ A nominal
• input power fuse 1 A type ABC-1

Output:

• 100 mA max, servo valve
• 10 mA max, actuator position
• 10 mA max, actuator error
• +24 VDC, 0.5 A nominal, 3 A max

Environmental:

• Operating temperature -20 to +70°C
• Storage temperature -40 to +85°C
• Vibration: Frequency range 2 to 100 Hz
• Velocity peak to peak 2 mm below 13.2 Hz
• Acceleration amplitude 0.7 g above 13.2 Hz

Physical:

• NEMA 12 case
• Dimensions:
• 290 mm L × 203.2mm W × 114 mm H
  (11.4" L × 8" W × 4.5" H)
• Weight, typical 3.4 kg (7.5 lbs)

Diagnostics:

• 2 x over/under current failure, Form C contacts, 1 A@ 30 VDC
• 2 x non follow up failure, Form C contacts, 1 A @ 30 VDC
• ±15 VDC OK indicators
• failure LED indicators