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Power amplifier

Power amplifier
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Power amplifier

DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY The information, recommendations, descriptions and safety notations in this document are based on Eaton Corporation’s (“Eaton”) experience and judgment and may not cover all contingencies. If further information is required, an Eaton sales office should be consulted. Sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between Eaton and the purchaser. THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, EXPRESSED OR IMPLIED,...

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Contents Index

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The amplifier is ready for use as supplied, but it must be properly installed by a qualified person using the machine designer's wiring diagram1. Safety notes 1. The amplifiers described in these installation and start-up guidelines are designed exclusively for electrical control of the corresponding Eaton proportional valves specified. 2. Start-up, maintenance and repair operations may only be performed by qualified personnel with knowledge of electrics/electronics. 3. The 24V DC supply voltage must meet the guidelines for safe low voltages according to VDE 0551/EN 607242/IEC 742. 1. Check...

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Type A Amplifer for proportaional control valves General description The power amplifier has five voltage inputs (one inverting) and a current input 0-20 mA. Adjustments for set zero point or deadband compensation and for gain allow the amplifier to be easily tuned to the proportional control valve. The ramp function generator can be switched on and off using the “ramp enable” control. User-friendly front panel with all the necessary adjustments, LEDs and monitor points Electronic overload protection with automatic reset Pulse width modulation for high efficiency Can be equipped with...

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EURO PAM 33 CATALOG E-VLVI-CC004-E1—December 2019 www.eaton.com

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Type A Amplifer for proportaional control valves Front panel 15V control voltage, green Solenoid output enabled, yellow Solenoid output overload, red 24V supply voltage, green Drive to solenoid, yellow Deadband compensation, ﬂow from P to A Potentiometers [17] Zero adjust Potentiometers [7] Deadband compensation, ﬂow from P to B [8] LED [11] Ramps enabled, yellow [12] Acceleration ramp [13] D eceleration ramp [14] C onditioned command signal MP1 Monitor points Monitor point [15] Common ground 0V [16] Spool position MP2 (except for 523/525: solenoid current) [20] Adjust valve zero

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Type A Amplifer for proportaional control valves Alarm output Drive zero signal indicator Ramp active indicator Command signal monitor point Output monitor point LVDT pilot Zero point Solenoid current Deadband compensation Enable ramps Zero point Enable ramps 24V Close to enable drive LVDT main NNote: This is a typical diagram and all the features depicted may not be applicable to all amplifiers, (e.g. LVDTs and dither) Table 3. All models except 553 and 571 Command signals and outputs Valve closed

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Operating data Table 3. continued Power supply: EURO PAM 33 CATALOG E-VLVI-CC004-E1 — December 2019 www.eaton.com 9

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command signal (MP1) Deadband compensation Factory setting (% of max. spool stroke) - 25% 15% 10% - - 10% 10% 10% Zero adjustment (% of max. spool stroke) 0 - 50% - - - +/- 25% +/- 25% - - -

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Type A Amplifer for proportaional control valves Wiring connections Amplifier models to Typical Valve Type Amplifier modelse: 513, 523, 525 Customer ’ protective ground connection. s NNote: If valves are fitted with the “B” type LVDT, the screen will be grounded at the valve end by the shell of the connector.

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Type A Amplifer for proportaional control valves Typical input connection circuitry Customer ’s protective ground connection. Valve solenoid connections LVDT connections Protective ground: Connection not required if power supply conforms to VDE 0551/EN 60742/IEC 742 Pilot stage 1. creened cables should be used for the command signals, the solenoid connections and the LVDT connections. S 2. articular attention should be paid to the grounding of the screens as shown in the diagrams. P 3. he screen on the LVDT cable needs to be grounded at both ends. An alternative method to prevent...

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Type A Amplifer for proportaional control valves Installation dimensions in mm (inches) Plug-in Unit of 3U Height (IEC 297) M2.5 x 11 (0.43) long collar screws supplied with panel for fixing Model designation

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Type A Amplifer for proportaional control valves Dedicated installation requirement for Type A card 5. Front panel indicator lights (LEDs) Wiring sizes Use 3-core screened cable ≥ 0.5 mm (20 AWG) per wire for signal and LVDT wiring. For wiring runs between amplifier and solenoid up to 50 meters (164 ft): EEA-PAM-523 and EEA-PAM-525 must have a wire cross-section of 1.5 mm2 (15 AWG); for all other models use wire of ≥ 1 mm2 (18 AWG) cross-section. Amplifiers may have some, or all, of the following LEDs, depending on amplifier type: Panel symbol Function indicated Normal working state Output...

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Valve connection table This table shows how the different valves have to be connected to the associated amplifier. Table 6. Value type Amplifier type Solenoid with LVDT or hydraulic A Solenoid without LVDT or hydraulic B Valve type Pilot stage LVDT Main stage LVDT

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General description The EEA-PAM-5**-B-33 Eurocards are power amplifiers with a four-input (demand signal) module and ramp function generator with quadrant detection for separate adjustment of acceleration and deceleration. The type of EEA-PAM-5**-B-33 amplifier used depends on the type of proportional valve, see "Model Codes". Includes all features of "A" amplifiers 2 ramp times set by front-panel potentiometers; can be varied by external voltage signals 4 adjustable command pre-sets selectable by 24V logic signal Polarity of 10V reference voltage selectable by 24V logic signal CE...

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