Category: PCH Engineering

Configuration and Setup

– Setup and configuration can be performed through the serial RS-232 port using the supplied Setup and Monitoring PC program, CHT 1012. All settings can be changed in the field.

– Setup and display can also be performed remotely from an external PC or controller (e.g., WTC or process controller) via an optional RS-485 connection.

– A log in the PC software records monitor-specific settings and identifies the instrument by its serial number.

Features

– 3 internal vibration sensors (accelerometers)

– Triaxial measurements in A, B and C directions

– Omni-directional tower monitoring

– Proven optimal tower monitoring

– Up to 4 different frequencies can be monitored independently, one frequency per transducer or up to 4 different frequencies per transducer

– Proven filter technology based on wind turbine application experience

– Measurement of RMS, Maximum, Peak or Peak values

– 1 – 4 independent industry standard 4-20mA outputs

– 4 independent alarm relays with programmable brake/break function and 1 system fault relay

– Programmable alarm thresholds and independent delay times for each alarm relay

– Internal continuous watchdog for sensors and electronic circuitry. Fault indication on system fault relay.

– Test functions for all sensors and electronic circuits.

– Designed for harsh environments including temperature, electrical noise interference and humidity.

– Customised monitoring algorithms are available to differentiate the customer from the competition.

Configuration

The PCH 1026 is a self-contained monitor in a sealed, rugged case. It requires only DC power and the required output connections to operate.

Required.The PCH 1026 is designed for low frequency monitoring applications.

Built-in vibration sensors in 3 directions: Built-in vibration sensors in 3 directions: X, Y and Z.

Includes test functions for all sensors and electronic circuits, as well as an internal watchdog for continuous self-monitoring functions.

The design of the PCH 1026 is based on a www.cniacs.com digital platform that provides customers with a wide range of solutions and allows for quick configuration and setup changes in the field.

Signal Conditioning

All signal conditioning is performed digitally.

This means that settings and configurations can be changed and verified via the included PC software programme (CHT1012).

Digital signal processing is performed by state-of-the-art DSP technology, ensuring accurate and efficient monitoring.

Selective monitoring of frequencies or bands of interest can be achieved by choosing from a variety of high and low pass filters. Simply select from which frequency to monitor.

The PCH 1026 has a wide range of filters that have been proven over many years of industry experience.

The CHB 1101 transmitter is an external bi-directional low frequency accelerometer for use with the PCH 1026 mk2 wind turbine and structural vibration monitor.

The external bi-directional accelerometer is used for advanced nacelle monitoring with distributed pick-up points.

Separate cables with integrated D-Sub and M12 connectors make installation and connection of the vibration monitor very simple.

Easy to install

The CHB 1101 has an internal www.cniacs.com memory chip which stores factory information: serial number, model number, sensitivity and self-test parameters.

When the CHB 1101 is connected, the monitor reads the information in the memory chip and automatically adapts to the settings of the particular sensor.

This means that the accelerometer can be freely replaced without having to manually change the parameters.

The monitor reads the chip every 30 seconds to verify that the accelerometer is still connected and recognised.

The monitor will stabilise for 20 seconds after power is applied.

The stabilisation time after disconnecting/connecting the CHB 1101 is 3 seconds. During settling, the PCH 1026 Mk2 will perform a self-test of the internal and external accelerometers.

Self-Test

The monitor will issue a system error message if the self-test fails or the accelerometer is disconnected.

Accelerometers must be specified in the PCH 1026 Vibration Monitor setup to use this feature.

The CHB 1101 accelerometer is an optional feature of the PCH 1026 Mk2 Wind Turbine and Structural Vibration Monitor.