Model: 8237-1246

Characteristics: Vibration resistance 0.04 G2/Hz, 1.04 Grms, 10 to 500 Hz

High voltage input: 90-264 Vac/ 47-63 Hz or 100-150 Vdc @ 30 W per module

Keyboard/Monitor: 4.2-inch display (3)

Nominal high output voltage: 115 volts AC / 240 volts AC / 125 volts DC

Nominal low output voltage: 24 volts DC

Operating temperature: -4 to +140 °F

Storage temperature: -4 to +158 °F

Weight: Less than 27 pounds

The 8237-1246 is a configurable overspeed detection system designed to safely shut down steam, gas and water turbines of all sizes when an overspeed or superacceleration event is sensed. Available with two dual redundant tripping relay outputs in a two-thirds voting architecture or three separate non-voting tripping relay outputs with separate alarm relays at 4-20 mA speeds

Acceleration detection

In addition, the 8237-1246 can be configured to protect the turbine from high acceleration events. The derivative of the speed signal is used to detect the turbine acceleration and issue the relevant trip command.

MPU detection

Each module’s speed sensor input uses a special MPU open detection circuit to verify that the MPU is properly connected prior to turbine operation, and a special speed loss detection logic to verify MPU function during turbine operation.

Automatic overspeed test program

Alternatively, ProTech-GII can be configured to perform routine overspeed tests on each module and then record and report the test results. In this test routine, each module completes its test sequence using an internal frequency generator to simulate overspeed conditions.