LDS Power Amplifiers
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S Y S T E M DATA LDS Power Amplifiers To suit old and new LDS® and third‐party shakers The LDS purpose‐designed HPA‐K, SPA‐K and DPA‐K range of power amplifiers are used to power our extensive range of shakers, along with the associated cooling systems and field power supplies. This modular approach to power amplifier design delivers a cost‐effective and future‐proofed solution for your vibration test capabilities. Extra power modules can be added into the SPA‐K and DPA‐K amplifiers in the event that you need a larger shaker or have different test requirements in the future. It also minimises support costs as individual power modules can easily be replaced as required. The whole test system can be controlled remotely, using an amplifier remote control unit for the SPA‐K and DPA‐K amplifiers, and the COMETUSB™ or LASERUSB™ controllers for the shaker. All amplifiers can also be used to control third‐party shakers. SPA‐K and DPA‐K Power Amplifier Features HPA‐K Power Amplifier Features • Scalable power in 8 kVA increments, allows future upgrade of shaker without replacing the amplifier • Complete control of shaker system possible from control room using amplifier remote control and shaker control in COMETUSB or LASERUSB • Energy‐efficient Class D amplifier design (greater than 90%) with additional Economy Running mode – reduces system operating costs • Space‐efficient design minimizes floor real estate • Low distortion, wide bandwidth (20 Hz to 3 kHz), and signal‐to‐ noise ratio better than –3 dB • Configurable interlocks provide multiple safety mechanism

Amplifier Overview HPA‐K Amplifier The HPA‐K amplifier is a dedicated 5 kVA unit optimized for use with the LDS V650 and V780 air‐cooled shakers to deliver greater force than if using the PA1000 amplifier. This compact unit delivers the power for both the shaker and field coils, as well as power for the cooling fan. The SPA176K amplifier delivers power from 88 kVA up to 176 kVA in 8kVA increments, and is used with the LDS V9x shaker. The amplifier incorporates the same extensive set of safety interlock circuits as the SPA‐K, as well as providing power for the FPS and cooling unit for the...

Complete Solutions Remote Control Capability Replacement Amplifiers The Remote Control option allows complete control of the SPA‐ K or DPA‐K amplifier from a remote location over 200 m (656 ft) away. The SPA‐K range of amplifiers has been designed to replace obsolete LDS amplifiers and can also be used to replace amplifiers supplied to drive third‐party shakers. The DPA‐K amplifier is controlled by a dedicated remote control panel mounted in a 19 rack. This unit, RCP9, offers all the controls available on the amplifier itself and can be located over 200 m away connected via a fibre optic...

Specifications – HPA-K, SPA-K and DPA-K Amplifiers Characteristics HPA‐K Input Supply Single‐phase, 50 Hz: 380, Standard, 3‐phase, 50/60 Hz: 400, 415, 440 V (line to line) 380 to 500 V Single‐phase, 60 Hz: 380, Low‐voltage, 3‐phase, 400, 415, 440, 480, 500 V 50/60 Hz: 200 to 220 V (line to line) Power Range Total Harmonic Distortion Typically 0.15% (measured into resistive load) up to 0.5 – 0.8% at rated output (measured into resistive load) Input Impedance Input Sensitivity 1.0 Vrms input for 100 Vrms output (differential input) 1.1 Vrms (±0.1 V) input for 100 Vrms at rated sinusoidal VA...

Power bays

Interlocks The following lists the available functions on the amplifier to help prevent damage to the operator and/or shaker system SPA‐K AMPLIFIER INTERLOCKS Overvoltage: The amplifier is being overdriven Overcurrent: The output current exceeds the user‐defined limit Amplifier Cooling: Over temperature (sensed by thermostats) of the amplifier supply transformer or rectifier stacks Vibration Overtravel: Shaker travel has exceeded the specified limits Vibration Cooling: Fault in the shaker cooling fan External 1 and External 2: Check that the outputs of the external interlocks are connected...

Replacement Amplifiers SPA‐K amplifiers are available to replace discontinued LDS amplifiers used with the following shakers, and are also available to replace most third‐ party amplifiers running third‐party shakers. These amplifiers can be used with the Software Remote Control Option. SPA56K AMPLIFIER REPLACEMENTS Shaker SPA24K AMPLIFIER REPLACEMENTS Shaker

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