| EPC
Servo Controller |
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| Applications |
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| Version: |
1.50 |
| Date
Published : |
1-Feb-06 |
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| The EPC (Electronic Pump Controller) is a
fully programmable micro controller-operated component that
can be applied to operate servo or proportionally operated
pumps and valves. The unit uses function program block(s) to
select the required operation. These function blocks include
calibration, KP, and KI functionality as required. The EPC
uses a windows based program to calibrate, monitor, and trouble
shoot the operation. For additional EPC technical information
visit the specifications
page, the documentation page or contact Oilgear via our ask
a question page . |
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| The following are a few of the applications
that the EPC is capable of: |
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| Flow
Control |
This
function block generates an output to the pump or valve
that is proportional to the input command. The output device
can utilize feedback or operate open loop. The input signal
has scaling and ramp capabilities if required.
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| Flow
Control with Pressure Limit |
This
function block generates an output to the pump or valve that
is proportional to the input flow command. If the system
pressure sensed at the pressure transducer exceeds the pressure
command set point the output flow command will be reduced
by a programmable amount. The output device can utilize feedback
or operate open loop. The input signal(s) have scaling and
ramp capabilities if required.
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| Flow
Control with System Horsepower Limit |
This
function block generates an output to the pump or valve that
is proportional to the input flow command. The system horsepower
is calculated using the flow command and the system pressure.
If the calculated horsepower exceeds the set point value the
flow is reduced holding the motor to its maximum horsepower.
This calculated horsepower control is much less expensive than
current transducers on the electric motor. The output device
can utilize feedback or operate open loop. The input signal(s)
have scaling and ramp capabilities if required.
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| Pressure
Control |
This
function block generates an output to the pump or valve
that is proportional to the error between the input command
and
the pressure feedback. The output device can utilize feedback
or operate open loop. The input signal(s) have scaling
and ramp capabilities if required.
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| Pressure
Control with Flow Preset |
This
function block generates an output to a pump or valve that
is proportional to the error between the input commanded
pressure and the actual pressure feedback input up to the
flow command source. Once the preset flow command is reached
the output will no longer increase with pressure demand.
The function will also switch between pressure and flow
control when a programmable switch point is reached. During
the pressure
control the function will reduce the output command to
reduce pressure overshoot. The input signals have scaling
and ramp
capabilities.
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| Closed
Loop Speed Control |
The
function block titled “Advanced Control with Feed-Forward” can
be used to perform closed loop speed control of a machine.
The function block in the open loop mode, generates an
output to the pump or valve that is proportional to the
input command.
When closed loop control is selected the input command
is compared to the machine velocity transducer. The error
between
the two is added or subtracted from the feed forward command.
The input signal(s) have scaling and ramp capabilities
if required.
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| Load
Sense Control |
This
function block generates an output to the pump or valve
to supply a constant flow independent of load changes.
This
is accomplished by maintaining a constant pressure drop
across an orifice. This orifice can be a fixed device or
part of
a valve. The control also monitors the down stream system
pressure, if it exceeds a preset value the output flow
command is reduced. The input signal(s) have scaling and
ramp capabilities
if required.
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