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HALT/HASS CONTROL

THALT/HASS control developed by Crystal Instruments, has Voltage/IEPE input channels, temperature measurement channels, and humidity channels. Output channels can generate various waveform signals to drive an electro-dynamic shaker, a water pressure shaker, and an air hammer. Proportional-integral-derivative (PID) control is used to guarantee the accurate control of temperature and humidity. 

 
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The HALT/HASS Control has independent embedded data transmitting interfaces. It also features programmable vibration ramps, gRMS level, and testing time. These parameters are accurately synchronized with the temperature and humidity control profile. When a stable state is reached, the accuracy of the temperature control is within 0.5 degree Celsius.

Simple Network Connection

Ethernet connectivity allows the Spider-H to be located far from the host PC. This distribution greatly minimizes the system noise and electromagnetic interference.  A single PC controls multiple Spider-H’s simultaneously via Ethernet connection.

Since the control process and data reading is handled within the control machines, an Ethernet connection will not impact the system reliability. By using wireless routers, a PC conveniently controls the Spider-H through Wi-Fi.

Excellent Control Design

Advanced control algorithms and a simplified DSP architecture substantially reduces the feedback time of temperature and humidity parameters. Improved adaptive PID algorithms satisfy the control needs of various temperature profiles. The Spider-H also provides fast safety guard responses.

Integrated Dynamic Signal Analysis Function

The Spider-H integrates a large amount of general signal analysis methods including time domain signal recording, transient signal capture, FFT, APS, and the transfer function analysis. Multiple Spider-H modules scale up to create a control system. For more information about vibration control systems, contact Crystal Instruments.

System Flow Charts

 
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Interface

 
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Components

The HALT/HASS Control is composed of a vibration control subsystem, a temperature control subsystem, a humidity control subsystem, and a safety protection subsystem.

Temperature Control System

The Temperature Control System structure is shown in the following diagram. When the temperature rises, by controlling certain interfaces of the digital output module, the Spider-H Controller implements the control of heating set circuit light-controlled (SCR)’s On/Off state. This activity therefore controls the heating set in the testing box to increase temperature. 

 
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The Spider-H Controller implements the control of two cooling electromagnetic valves when the temperature decreases by controlling certain interfaces of the digital output module. This activity therefore controls the injection of liquid state nitrogen to lower the temperature. The temperature sensor in the testing box acquires the temperature data, transmits the data to the Spider-H Controller via measuring channel, and returns the data to EDM software.

Vibration Control System

The Vibration Control System structure is shown in the following diagram. By controlling certain interfaces of the analog output module outputting 4-20 mA signals, the Spider-H Controller implements the control of electrical ratio valves which adjust the high pressurized air from the air source. The distributor then allocates the air to each air hammer. 

 
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The vibration signal acquired by the accelerometer from the testing table is transmitted to the Spider-H Controller and is returned to the PC end.

Humidity Control System

The structure of the Humidity Control System is as shown in the following diagram.

To increase humidity, water is pumped into the steam generator. By controlling certain interfaces of the digital output module, the Spider-H Controller implements the control of the On/Off state of the steam valve. Therefore the steam flow is controlled, and injected to the testing box via pressure and temperature switches.

To decrease humidity, by controlling certain interfaces of the digital output module, the Spider-H Controller implements the control of the dehumidification electromagnetic valve on the liquid state nitrogen tank. This activity therefore controls the flow of liquid state nitrogen. The dehumidification electromagnetic valve is not on the ventilation circuit, therefore cooling condensation occurs locally. Steam is converted to water which flows out the testing box through a special tube. Diffusion reduces the humidity evenly.

The humidity sensor in the testing box acquires the real-time value, transmits it to the Spider-H Controller, and returns it to the EDM software program.