Instruction manual

80
4 12 Pump Control4 12 Pump Control
Pump Control function is one of the unique features of the ETR-3400. Using
this function, the pressure in a process can be controlled precisely. The
pressure in a process is commonly generated by a pump driven by a variable
speed motor. The complete system has the following which
affects the control behavior: , The system is very noisy. , The pressure is
changed very rapidly. , The pump characteristics is ultra nonlinear with
respect to its speed. , The pump can't generate any more pressure as its
speed is lower than half of its rating speed. , An ordinary pump may slowly
characteristics
12
3
4
5
Pump Control function is one of the unique features of the ETR-3400. Using
this
function, the pressure in a process can be controlled precisely. The
pressure
in a process is commonly generated by a pump driven by a variable
speed
motor. The complete system has the following which
affects
the control behavior: , The system is very noisy. , The pressure is
changed
very rapidly. , The pump characteristics is ultra nonlinear with
respect
to its speed. , The pump can't generate any more pressure as its
speed
is lower than half of its rating speed. , An ordinary pump may slowly
characteristics
12
3
4
5
Obviously a conventional controller can't fulfill the conditions mentioned
above. Only the superior noise rejection capability in addition to the fast
sampling rate owned by ETR-3400 can realize such application. To achieve
Obviously a conventional controller can't fulfill the conditions mentioned
above.
Only the superior noise rejection capability in addition to the fast
sampling
rate owned by ETR-3400 can realize such application. To achieve
FUNC=FULL
EIFN=NONE
PVMD=PV1
FILT=0.5
SELF=NONE
SPMD=PUMP
SP2F=DEVI
FUNC=FULL
EIFN=NONE
PVMD=PV1
FILT=0.5
SELF=NONE
SPMD=PUMP
SP2F=DEVI
Key menuKey menu
SPMD
SP2F
REFC
SP2
SPMD
SP2F
REFC
SP2
and program the following parameters in the user menu:and program the following parameters in the user menu:
REFC= Reference constant
SP2= A negative value is added to SP1 to obtain the set point for idle
state
REFC= Reference constant
SP2=
A negative value is added to SP1 to obtain the set point for idle
state
Since the pump can't produce any more pressure at lower speed, the pump
may not stop running even if the pressure has reached the set point. If this
happens, the pump will get worn out and waste additional power. To avoid
this, the ETR-3400 provides a in the user menu. If
PUMP is selected for SPMD, the controller will periodically test the process by
using this reference constant after the pressure has reached its set point.
If the test shows that
the pressure is not consumed by the process, the controller will gradually
decrease the power to the pump until the pump stops running. As this
happens, the controller enters . The idle state will use a lower set
point which is obtained by adding SP2 to SP1 until the pressure falls below
this set point. The idle state is provided for the purpose of preventing the
pump from completely stopping and restarting too frequently. The value of
Reference Constant REFC
idle state
If the
test shows that the pressure is still consumed by the process, the controller
will continue to supply appropriate power to the pump.
Since the pump can't produce any more pressure at lower speed, the pump
may
not stop running even if the pressure has reached the set point. If this
happens,
the pump will get worn out and waste additional power. To avoid
this,
the ETR-3400 provides ainthe user menu. If
PUMP
is selected for SPMD, the controller will periodically test the process by
using
this reference constant after the pressure has reached its set point.
If
the test shows that
the
pressure is not consumed by the process, the controller will gradually
decrease
the power to the pump until the pump stops running. As this
happens,
the controller enters . The idle state will use a lower set
point
which is obtained by adding SP2 to SP1 until the pressure falls below
this
set point. The idle state is provided for the purpose of preventing the
pump
from completely stopping and restarting too frequently. The value of
Reference
Constant REFC
idle
state
If the
test
shows that the pressure is still consumed by the process, the controller
will
continue to supply appropriate power to the pump.
The pump functions are summarized as follows:
1. If the process is demanding material (i.e. lose pressure), the controller
will precisely control the pressure at set point.
2. If the process no longer consumes material, the controller will shut off the
pump as long as possible.
3. The controller will restart the pump to control the pressure at set point as
soon as the material is demanded again while the pressure falls below a
predetermined value (i.e. SP1+SP2).
The pump functions are summarized as follows:
1.
If the process is demanding material (i.e. lose pressure), the controller
will
precisely control the pressure at set point.
2.
If the process no longer consumes material, the controller will shut off the
pump
as long as possible.
3.
The controller will restart the pump to control the pressure at set point as
soon
as the material is demanded again while the pressure falls below a
predetermined
value (i.e. SP1+SP2).
Pump Control Features:Pump Control Features:
1. Minimum oscillation of pressure
2. Rapidly stabilized
3. Guaranteed pump stop
4. Programmable pump stopping
interval
1. Minimum oscillation of pressure
2.
Rapidly stabilized
3.
Guaranteed pump stop
4.
Programmable pump stopping
interval
PUMP: A Cost Effective
yet Perfect Solution
PUMP: A Cost Effective
yet
Perfect Solution