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Example

l Runningthepump,e.g.atalowspeed“against”thebuilt-uppressure.Scope

plot(KeStudioDriveManager5)forScopeID11–m_actyieldsameanvalue

ofM=15.9[Nm].Thebuilt-uppressureatthepressuresensorisp=100[bar]

=>c_M=0.159[Nm/bar]=>V_g=10[ccm/rev]

Accordingly, both parameters (P2851[0; 1] - HYD_Pump) can be set. However, only

one of the two values should be set. The other one will be automatically calculated

afterwards and will be shown accordingly.

P2851[2] - HYD_Pump is used to set the nominal pressure. P2851[3] - HYD_Pump

specifies the volumetric efficiency at this rating point. This information will then be

used to calculate the leakage volumetric flow rate, which is used internally to control

the volumetric flow rate.

For pumps with variable-displacement volume, a second pump data set can be

created P 2873 HYD_Pump2. This can be selected via P 2863 HYD_TabCtrl bit 8 for

the respective motion block (7.11.6  Hydraulic Motion profile). Alternatively, the

displacement volume can also be adjusted online via a pump scaling using P 2879

[2] Pump1_DisplScalePDO and P 2879[3] Pump2_DisplScalePDO. This allows the

displacement volume to be changed variably during the process.

7.11.2.1Speedlimits

The pump’s minimum and maximum speeds can be set in P2851[4; 5] - HYD_

Pump. The control system will not exceed or fall below

the values set there.

ID No.: 0842.26B.5-01Date: 09.2020

ServoOne- Device Help

178

7 Control

Example

l Maximumspeed:3000[rpm],Minimumspeed:0[rpm](pumpisnotallowed

torotate“backwards”)

l Maximumspeed:3000[rpm],Minimumspeed:-200[rpm](pumpisonly

allowedtorotatebackwards“slowly”)

l Maximumspeed:3000[rpm],Minimumspeed:-3000[rpm](norestrictionfor

negativespeeds)

In contrast, the pump protection functions, among other functions, are used to protect

the pump against thermal or mechanical destruction at low speeds. As per the

corresponding explanations, the configured “critical speed” can definitely be fallen

below.

In addition to the pump speed, the pump acceleration and deceleration can also be

limited. Parameters P 2855 HYD_PumpAcc and P 2856 HYD_PumpDec can be

used to set the maximum permissible ramp of the pump. (see 7.11.6.2  Servo pump

speed ramps)

Keba ServoOne User Manual

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