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Summary of Contents for Wilcoxon PA8HF
- Page 1 PA8HF power amplifier Operating guide Wilcoxon Sensing Technologies Tel: +1 (301) 330-8811 20511 Seneca Meadows Parkway, Germantown MD 20876, USA Tel: +1 800 WILCOXON Fax: +1 (301) 330-8873 Amphenol (Maryland), Inc d/b/a Wilcoxon Sensing Technologies www.wilcoxon.com 97012 Rev D 8/17...
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Page 2: Table Of Contents
Contents Safety section Safety summary 1.0 Product description 1.1 Front panel 1.2 Rear panel 2.0 Operation of the power amplifier 2.1 Using the power amplifier with an electromagnetic shaker 2.2 Using the power amplifier with a piezoelectric shaker 2.3 Matching networks 3.0 Initial system setup 3.1 AC line power 3.2 Signal input... -
Page 3: Safety Section
WARNING: OPERATION OF THIS AMPLIFIER IS SAFE WHEN THE INSTRUCTIONS IN THIS MANUAL ARE READ THOROUGHLY BEFORE THIS SYSTEM IS CONNECTED TO ELECTRICAL POWER. PARTICULAR ATTENTION MUST BE PAID TO THE SAFETY SECTION OF THIS MANUAL. IT IS THE ULTIMATE RESPONSIBILITY OF THE USER TO SAFELY SET UP, OPERATE AND MAINTAIN THE SYSTEM. -
Page 4: Safety Summary
4. To reduce the risk of electric shock, do not remove the power amplifier cover. No user-serviceable parts are inside. Refer all servicing issues to Wilcoxon Sensing Technologies. 5. Do not attempt to operate a power amplifier without the protective covers secured. -
Page 5: Product Description
The PA8HF is a single-channel, rack-mountable power amplifier designed to high performance standards. The PA8HF develops a maximum of 800 watts of power into a 4 Ohm load. The amplifier will drive the full range of Wilcoxon shakers, with the ability to drive the larger shakers to the full performance limits of the shakers. -
Page 6: Rear Panel
This fuse is connected in the power amplifier output circuit to aid in protecting the power amplifier or shaker from excessive current. The PA8HF power amplifier is supplied with a 12 Ampere fuse. The recommended fuse type is 3AG or AGC. Manual section 2.1 lists other values of fuses that may be used when driving electromagnetic shakers. - Page 7 or matching network. 1.2.4 Input connector: A BNC coaxial connector located on the rear panel provides the input connection for the power amplifier. 1.2.5 Piezo filter switch: This is a toggle switch located on the rear panel. This switch allows the user to enable the 500 Hz (-3 dB point) high pass filter required when driving piezoshakers using matching networks.
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Page 8: Operation Of The Power Amplifier
A signal source to drive the power amplifier is not part of the system and must be supplied by the user. This guide describes the operation of the PA8HF power amplifier. Other guides describe the operation of the matching networks and shakers. For all vibration generating systems a customer supplied signal generator is necessary to operate the vibration generating system. -
Page 9: Using The Power Amplifier With A Piezoelectric Shaker
CAUTION: In these modes of operation power amplifier must be used with a Wilcoxon matching network. Do not attempt to operate the power amplifier without the appropriate matching network. - Page 10 When driven at high power levels this heat buildup will raise the temperature of the piezoceramic to the Curie temperature where it will depolarize itself. Please contact Wilcoxon Sensing Technologies for assistance when extended high output testing will be performed.
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Page 11: Initial System Setup
3.0 Initial system setup Note: All cables should be installed and connections should be completed before switching the power/circuit breaker switch to "ON." 3.1 AC line power The power amplifier is wired at the factory for either 120 VAC or 230 VAC. This AC voltage power wiring is not changeable by the user. -
Page 12: Operation
Verify the AC voltage is correct and all necessary cables are securely attached. 1 – On the back panel of PA8HF, before plugging the unit into an AC power source make certain the ‘Main Switch/Breaker’ is in the off position. Proceed to step 2. - Page 13 1 and 2. See photo of rear panel. If this condition persist, contact Wilcoxon Sensing Technologies as the unit is most likely damaged. 4 – Once the Status light is green, connect the oscillator cable making certain the oscillator output is set to its lowest (0 volts) output.
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Page 14: Test Operation
If there is no force output from the shaker after increasing the signal level to the PA8HF, reduce the signal generating system output signal to its minimum, turn off all power, check all instrumentation components, check all system fuses, and check all cabling before re-applying power. -
Page 15: Maintenance
DO NOT substitute a higher value or a different type of fuse. Decrease the matching network output voltage tap or decrease the level of the signal generator. Consult Wilcoxon Sensing Technologies for more information about inductive tuning or other special application assistance. -
Page 16: Technical Assistance
Consult the matching network’s manual for details. CAUTION: The power amplifier contains no user serviceable components. Service or repair of the power amplifier should not be attempted by anyone other than Wilcoxon Sensing Technologies employees or designated representatives. 6.0 Technical assistance 6.1 Technical assistance...
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