Controllers. ETP. Electro-proportional flow setting, power limitation
and pressure cut-off
The HPR with ETP-controller delivers a volume flow which is exactly proportional to the electric control signal. Superposed, the
controller offers a hyperbolic power limitation, which optimally exploits the power of the prime mover and also protects it from
overload. In addition to this, a pressure cut-off protects the hydraulic system.
The controller is supplied via a feed port "E" at the port plate housing.
The ETP-controller offers a so called hydraulic power mode function. This means, that the regulation begin of the power limitation
can be shifted from its mechanical basic setting by means of a remote control port Z1/Z2 at the controller. If the regulation begin
is intended to be below the basic setting, which means that the pump performance is reduced, then the port Z2 is used, S4 is
closed. If the mode function is not used at all, or only with the Z1 port, S4 is equipped with an orifice. Z2 is then sealed pressure
tight
. For details, see
<<Pump controllers with
position feedback
. T
-axis>>
The responding behaviour of the pressure cut-off can be remote-controlled by an hydraulic signal at the XD port as an option.
S1 is then equipped with an orifice and S2 is sealed. If only the mechanical preset of the PCO is used, S1 is sealed and S2 is not
equipped. Details,
see <<Pump
c
ontrollers with
position feedback
. P-axis>>
Characteristic ETP-controller
ETP-controller
1 Displacement
2 Pressure
Maximum performance range of the pump
Electro-proportional flow setting
Provided power
Regulation begin power limitation
Pressure cut-off basic setting
Characteristic shifting by control signal
Pressure cut-off basic setting
Characteristic shifting by control signal
p
max
2
1
Q
max
Z1
Z2
XD
31
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