Home Vickers EEA-PAM Power Amplifiers EEA-PAM-571-A-12

EEA-PAM-571-A-12 Vickers

Name: EEA-PAM-571-A-12
Brand: Vickers
Price: 347 USD
Availability: InStock
Rating: 4.5 (63 reviews)

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The Vickers EEA-PAM-571-A-12 power amplifier is part of the EEA-PAM Power Amplifiers series and operates with a nominal supply of 24 VDC at 50 W. It features position control, factory set dither, and supports both current and voltage input signals. The unit includes front panel LED indicators, output drive with PWM and short-circuit protection, and reverse-polarity protection.

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Product Description:

The EEA-PAM-571-A-12 is a power amplifier card produced by Vickers within the EEA-PAM Power Amplifiers series. Designed for hydraulic proportional valve systems, the module converts low-level command signals into controlled solenoid current so that actuator position follows a reference in closed-loop machinery. Its board format allows quick installation in control racks and links electrical automation platforms with electro-hydraulic motion elements.

The card operates from a 24 VDC × 50 W supply, a rating that defines the voltage and power budget required from the control cabinet. It accepts command references as either current or voltage signals, enabling compatibility with a variety of PLC analog outputs. The output stage delivers a PWM, short-circuit protected drive so the load is energized through a pulse-width modulated current that automatically disconnects under faulted wiring. Power integrity is safeguarded by a reverse-polarity barrier that prevents damage if the supply leads are crossed, and in the event of excessive load the board uses an automatic reset circuit to restore normal operation after the fault clears.

Environmental and functional adjustments are handled on the front panel. Operating temperature is specified from 0 to 50 °C, which covers most indoor machine enclosures without additional climate conditioning. Status LEDs provide front-panel indicators for power, error, and enable states so maintenance staff can verify behavior at a glance. A switchable ramp function lets the user introduce controlled acceleration and deceleration, while the factory set dither reduces valve hysteresis without manual tuning. Monitor points are included so technicians can measure command and feedback levels during commissioning. The card uses position control as its primary algorithm and accommodates additional plug-in supported special modules to extend features such as external feedback scaling.

Specs
Revisions
Common Troubleshooting Steps
Product Comparison
Similar Ordering Codes
Common Error Codes

Ambient Temp Range
0 to 50 °C

Control Type
Position Control

Dither
Factory Set

Front Panel Indicators
LEDs

Input Signal Type
Current Or Voltage

Monitor Points
Included

Nominal Supply
24 VDC x 50 W

Output Drive
PWM, Short-Circuit Protected

Overload Reset
Automatic Reset

Polarity Protection
Reverse-Polarity

Ramp Function
Switchable

Special Modules
Plug-In Supported

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Symptom or LED pattern (front panel)	Probable cause	Quick troubleshooting step
Green “24 V” LED off	No / low 24 V DC (< 20 V) or reversed polarity	Verify cabinet PSU voltage, fuse and wiring polarity; restore 24 V then repower the card.
Green “15 V” LED off (24 V LED on)	On-board ±15 V logic rail missing	Measure ±15 V at test jacks; if absent, replace the regulator stage or the whole card.
Yellow “Enable” LED dark even though PLC sends > +10 V to pin z24	Drive-enable line actually < +6 V (broken PLC output / bad field wire)	Trace & repair z24 wiring, restore proper voltage, reseat the card to reset the latch.
Red “Overload” LED lit	Solenoid current > 2.5 A (shorted coil or wrong valve type)	Measure coil resistance, inspect cable for shorts, fit correct coil and cycle 24 V.
Red “Watchdog” LED flashing	Internal micro-controller fault or noisy 24 V line	Power-cycle the card; if watchdog trips again, shield supply wiring or replace card.
Red “LVDT Fail” LED	Feedback transducer open-circuit or out-of-range	Check ±15 V sensor supply, inspect 6-pin LVDT cable, re-zero the servo loop.
Valve overshoots, quad-ramp pots ineffective	Quadrant-ramp disable link b12–b20 left closed	Remove jumper or route it through a remote switch to re-enable quad ramps.
Command present but no valve motion	Set-minimum or Gain* pots fully CCW*	Turn both pots clockwise until monitor jack MP1 shows ≈ ±0.5 V; test valve travel.
PID integrator pegged (MP6 stuck at max)	I-gain too high or sensor polarity reversed	Reduce I-gain trim, swap LVDT phase leads if needed, power-cycle to clear wind-up.
Card resets when cabinet temp > 50 °C	Internal over-temperature shutdown	Improve panel ventilation, keep ambient < 45 °C, allow cool-down before restart.

Model	Intended Valve Family	Command Inputs	Ramp Generator	Diagnostics / LEDs	Max Coil Current (A)
EEA-PAM-571-A-12	KFDG5V high-dynamic servo ±10 V + ±15 V ref	Four-quadrant (acc/dec each direction)	24 V, 15 V, Enable, Overload, LVDT Fail, Watchdog	2.5
EEA-PAM-571-A-14	Same as above (newer revision)	±10 V + ±15 V ref	Four-quadrant	LVDT Fail, Overload, Watchdog, Temp	2.5
EEA-PAM-553-D-33	KSDG4V-3 servo spools	±10 V + sensor ref.	Quad-ramp (each quadrant)	24 V, 15 V, Enable, Overload, Dual LVDT Fail	2
EEA-PAM-561-A-14	KDG5V-5/7 spools with LVDT	±10 V	Dual independent ↑ / ↓ ramps	24 V, 15 V, Enable, Overload, LVDT Fail	1.8
EEA-PAM-535-D-33	KF*G4V-5 proportional flow	0-10 V × 5 \| 0-20 mA × 1	Single adjustable (20 ms–3 s)	24 V, 15 V, Enable, Overload	1.6
EEA-PAM-525-A-14	KDG4V-5 high-flow directional	0-10 V × 5 \| 0-20 mA × 1	Single adjustable	24 V, 15 V, Enable, Overload	1.6

Indicator / Condition	What it Means
Green “24 V” LED off	No or low 24 V DC supply (< 20 V) or polarity reversed
Green “15 V” LED off (24 V LED on)	On-board ±15 V logic rail missing
Yellow “Enable” LED dark though PLC drives > +10 V to pin z24	Enable line actually < +6 V (broken PLC output / field wiring)
Red “Overload” LED lit	Coil current > 2.5 A (shorted coil or wrong valve)
Red “Watchdog” LED flashing	Micro-controller fault or noisy 24 V
Red “LVDT Fail” LED	Feedback transducer open-circuit / out-of-range
Ramp pots ineffective / valve jerks	Quadrant-ramp bypass link b12–b20 left closed
Command present but no valve motion	Set-minimum or Gain* pots fully CCW*
PID integrator pegged (MP6 at limit)	I-gain too high or LVDT polarity reversed
All LEDs extinguish > 50 °C	Internal over-temperature shutdown

Frequently Asked Questions about EEA-PAM-571-A-12:

Q: What is the required supply voltage and power for the EEA-PAM-571-A-12 amplifier?

A: The EEA-PAM-571-A-12 power amplifier operates on a nominal 24 VDC supply with a power consumption of 50 W.

Q: What types of input signals can the EEA-PAM-571-A-12 accept?

A: This model supports both current and voltage input signal types, allowing flexibility in signal interfacing.

Q: How does the EEA-PAM-571-A-12 handle overload situations?

A: The EEA-PAM-571-A-12 features automatic overload reset to help protect against overcurrent conditions.

Q: Is the ramp function on the EEA-PAM-571-A-12 adjustable or switchable?

A: This power amplifier provides switchable ramp function for control adjustments as needed.

Q: Does the EEA-PAM-571-A-12 include protection against reverse polarity?

A: Reverse-polarity protection is included on the EEA-PAM-571-A-12 to safeguard against incorrect power wiring.

Internal Product Review

‘‘The EEA-PAM-571-A-12 is a power amplifier from Vickers designed for position control with both current and voltage input signal compatibility. It features switchable ramp function and factory-set dither for optimal valve response. Automatic overload reset and reverse-polarity protection further highlight its focus on reliable, safe operation.’’