Purpose

– Long-term monitoring of low-frequency structural and seismic vibration

APPLICATIONS

– Wind turbines

– Tower vibration

– Drive train vibration (pitch turbines)

– Blade edge vibration (stall turbines)

– Steel towers

– Chimneys

– Bridges

– Buildings

– Seismic Vibration to ISO4866

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 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.

Alarm and System Fault Relays

Alarm Relays:

The PCH 1026 provides 4 independent alarm relays with programmable “on” or “off” functions.

All 4 relays can be assigned to the desired frequency or measurement direction.

For example one relay is responsible for the desired frequency, or the same relay can be responsible for up to 4 different frequencies.

Alarm threshold levels, delay times, latching or non-latching functions can be set independently for each relay using the supplied PC software.

System Failure Relay:

The PCH 1026 provides system fault relays with disconnects for optimum fail-safe configurations.

Configuration. A fault detected by the PCH 1026’s internal watchdog will trigger the system fault relay in either test mode or monitor mode.

The system fault relay responds to the following conditions: power failure, overload, processor stop, sensor failure.

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