509200
4Pages

Catalog excerpts

Vickers® Accessories Power Amplifiers for PVH-EDC Pumps EEA-EDC-436-A*-14 Design General Description These amplifiers are designed for controlling Vickers PVH pumps with electronic displacement control. A1 - For use with PVH57 & 74 A2 - For use with PVH98 A3 - For use with PVH131 The pulse-width-modulated power output stage drives a single solenoid proportional spool valve which hydraulically controls the pump yoke position. Feedback of the yoke position and pump output is from a rotary feedback transducer which closes the control loop and ensures accurate pump output flow. Analog command input signals can be non-inverting current, or non-inverting, inverting or differential voltages. The amplifier requires a power supply of 24V DC and is enabled by a 24V logic signal. The ramp is normally enabled but can be selectively disabled by suitable wiring to an external switch. The amplifier front panel contains LEDs showing the status of power, control supply and outputs. Potentiometers for adjusting ramp and gain are also mounted in the front panel. Features D Constant current amplifier D Voltage or current command signals D 1 ramp for acceleration and deceleration D 24V DC power supply D Pulse-width-modulated coil drive D Wide supply voltage range and tolerance to ripple D Low supply voltage protection D Ramp setting unaffected by gain adjustment. Panel Display LEDs 1. 2. 3. 4. 5. 6. 24V power supply input, green 15V control supply output, green Output (solenoid) enabled, yellow Overload, red Transducer failure, red Output level to solenoid, yellow 24 15V V ma x 7. Gain Potentiometers 8. Ramp Monitor Points 9. Monitor point H- conditioned command signal 10. Common ground 0VH 11. Monitor point yoke position H ∅2,0 (0.0787 dia.) sockets 5092.00/EN/0298/A

Open the catalog to page 1

Operating Data (Amplifier) Power (input) supply Control (output) supply: Command signal inputs: Direct voltage pins Inverting voltage pin Current pin Voltage range Input impedance (voltage) Current range Input impedance (current) Standing solenoid current at zero command signal Gain adjustment Ramp time adjustment, linear: Factory setting Adjustment per solenoid Dither Feedback from yoke transducer to b14 20 to 34V DC x 40W max. 24V DC nominal <4V pk-to-pk ripple Amplifier shuts down below 19V +15V x 50 mA max. +10V x 5 mA max. –10V x 5 mA max. All outputs short-circuit protected b8, b6,...

Open the catalog to page 2

Circuit and Connections Eurocard Amplifier = +24V z6 Current command output enable 100Ω Command singal inputs (See table) zbd32 zbd30 ground z12 output enable z24 Overload low voltage = + b6 b8 b10 z8 z10 47kΩ ramp gain z4 PE Supply green PE green b26 Power stage Voltage command Ramp Controlenable zero b20 24V DC S Power b28 dither z28 Output z26 z22 b14 b16 PWM b4 S red z2 +10V 5 mA b2 –10V 5 mA z22 +15V 50 mA PE white orange black S b12 Link to disable ramp Yoke position monitor point on front panel Command signal monitor point (conditioned) on front panel Pump Assembly “F” case drain “B”...

Open the catalog to page 3

Command Signals/Installation Dimensions for Amplifier Command Signals Type Input pins Signal polarity Non-inverting voltages b6/8/10 or z8 + Non-inverting current z6 + z10 – One of b6/8/10 or z8 Secondary pins ref. + bz4 Inverting voltage Differential voltage Link one of b6/8/10 or z8 to bz4 One of b6/8/10 or z8 z10 and link one of b6/8/10 to bz4 Installation Dimensions Plug-in unit of 3U height, to IEC 297 3rd angle projection mm (inch) DIN 41612 F48 male connector 7,92 (0.31) z-pin row b-pin row d-pin row Components envelope M2,5 x 11 (0.43) long collar screws supplied with panel for...

Open the catalog to page 4