EPC
SERVO AMPLIFIER MODULE
Part Number L723888-3xx
ELECTRONIC
Telephone: (231) 929-1660
Oilgear
Fax:
(231) 929-7879
1424 International Dr
Issued May 31, 2018
Web Site:
www.oilgear.com
Traverse City, MI USA 4 9 6 8 6
Bulletin 836260F
1 Introduction
The EPC is a fully programmable microcontroller-operated controller and
amplifier for servo controlled hydraulic pumps and valves. The unit can be
configured for several types of control applications including:
•
Flow Control
•
Pressure Control or Load Control
•
Flow Control with Pressure Limit (PQ-Control)
•
Horsepower Control (Pump Stroke and Pressure)
•
Pressure Control with Flow Preset
•
Advanced Control with Feed-Forward.
2 Basic System Overview
The EPC allows one (1) single control axis with a power amplifier to drive VS-, VV- and VM-controlled
pumps and valves. The basic pump controller configuration allows for closed loop response with both
stroke position and pressure feedback. In addition, two (2) independent function programs can be
dynamically selected with a digital input signal. The unit provides a digital output for simple diagnostics or a
watchdog signal.
Three (3) general-purpose analog inputs are provided for command and pressure feedback signals including
±10 VDC, 0-to-20 mA, or 4-to-20 mA (see Section 6.4 Note 3 for current mode resistor). Additionally, one
(1) analog input is provided as a dedicated fine-adjustable LVDT stroke feedback device. The module allows
for (2) two low-power programmable output signals.
The device is configured by first assigning one of twelve (12) built-in function programs to each of the two
(2) program blocks. Typically, the output of the function programs is then passed to the Pump Controller,
which provides the valve command.
Figure 2: System Overview
Figure 1: EPC
Module
4
Analog
Outputs
Analog
Inputs
Stroke Feedback
Pressure Feedback
Pump
Controller
Block
Selection
Digital
Output
Diagnostics
Program Block 2
(Program 0..12)
Program Block 1
(Program 0..12)
Digital
Input
