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Continental Hydraulics Installation Manual

Page 21 of 24

CEM-PA-B

CHI 1020688 01/2016

Failure monitoring

Following possible error sources are monitored continuously when SENS =
ON/AUTO:

Source

Fault

Characteristic

Command signal PIN
9/10

4... 20 mA

Out of range or broken
wire

The output will be switched
off.

Feedback signal PIN 14

4… 20 mA

Out of range or broken
wire

The output will be switched
off.

Solenoids on PIN 3-4

Wrong cabling, broken
wire

The power stage will be
deactivated.

EEPROM
(when switching on)

Data error

The output is deactivated.

The module can only be
activated by saving the
parameters again!

CAUTION: Take care of the EOUT command. Changes will influence the
behavior.

Содержание CEM-PA-B

Страница 1: ...system requirements Input command can be ramped PID variables are adjustable over a wide range The Amplifier is easily switched from open loop to closed loop control Min and Max output current are ad...

Страница 2: ...Diagram 6 LED Definitions 7 Terminal Identification 7 Parameter List 8 Command Parameter Descriptions LG Language 9 MODE 9 SENS 9 EOUT 10 SYS_RANGE 10 SIGNAL X SIGNAL W 10 AINMODE Signal Scaling mode...

Страница 3: ...0 390 Ohm Signal resolution 0 006 incl Oversampling PWM output A 0 5 to 2 6 Amp broken wire and short circuit monitored PWM frequency Hz 61 2604 Sample time pressure control ms 1 Sample time solenoid...

Страница 4: ...the GUI program 6 Open the Options Tab and verify that the correct com port full Duplex and 57 6K Baud rates are selected 7 Connect with the CEM by selecting the connect button 8 Click on the ID Butt...

Страница 5: ...no need for shielding on these power conductors Wire size is chosen to provide an acceptable voltage drop between the module and the valve solenoid The following chart is based on 5 drop for 12v and 2...

Страница 6: ...Continental Hydraulics Installation Manual Page 6 of 24 CEM PA B CHI 1020688 01 2016 Circuit Diagram...

Страница 7: ...ers are inconsistent To acknowledge the error data has to be saved with the SAVE command or the corresponding button in the CHI PC GREEN GREEN YELLOW A Terminal Identification Input and output signals...

Страница 8: ...14 RA DOWN 100 Command signal ramp time ms X X 15 C P 50 P gain x 0 01 x X 15 C I 4000 I gain 0 01ms X X 15 C D 0 D gain 0 1ms X X 15 C D_T1 500 D gain filter 0 1ms x X 15 C FF 8000 Feed forward 0 01...

Страница 9: ...have a more significant influence on system behavior and should accordingly be changed with care SENS Malfunction monitor Command Parameters Unit Group SENS x x ON OFF AUTO STD This command is used to...

Страница 10: ...parameter set The effects should be analyzed by the user for each application from the point of view of safety SYS_RANGE System pressure Command Parameters Unit Group SYS_RANGE X x 10 1000 bar STD Th...

Страница 11: ...nput signal being used are not as listed the AINMODE is available in the MATH mode where the input signals can be scaled by a linear equation To enter the MATH option you must change the AINMODE to MA...

Страница 12: ...e B In the case of a 4 20mA with a single solenoid valve the total range is 0 20mA which means A 20 The actual range is 4 20 mA therefore B 20 4 16 An offset C must be added to compensate for the 0 4m...

Страница 13: ...justment of the zero point of the sensor If the command signal and feedback signals are not zeroed to each other this offset should be used Using of the commands SYS_RANGE N_RANGE X and OFFSET X Examp...

Страница 14: ...ge 14 of 24 CEM PA B CHI 1020688 01 2016 RA Command signal ramp time Command Parameter Unit Group RA I X i UP DOWN x 1 600000 ms STD Two quadrant ramp function The ramp time is separately set for UP a...

Страница 15: ...10000 0 01 0 1 ms 0 1 ms 0 1 ms 0 01 STD The control function will be parameterized via this command The C P I and D gain are similar to a standard PID controller The T1 factor is used for the D gain...

Страница 16: ...olled by this command C I_LIM Limitation of the integrator range faster control function by reduced pressure overshoots By a high nonlinearity of the valve the LIM value must be sufficient to compensa...

Страница 17: ...ith the MIN value the overlap dead band of the valve will be compensated Via the TRIGGER the activation point of the MIN function is set and so a non sensitive range around the zero point1 can be spec...

Страница 18: ...the nominal output current3 see CURRENT command The dither frequency is defined in Hz Depending on the internal calculations the frequency is adjustable in steps only4 The PPWM and IPWM parameters in...

Страница 19: ...z The optimum frequency depends on the valve If the PWM frequency is less than 500 Hz the dither amplitude DAMPL should be set to zero The PPWM and IPWM parameters should be adapted when using low PWM...

Страница 20: ...adjustments are done automatically If the PWM frequency is 250 Hz the dynamic of the current controller has to be decreased Typical values are PPWM 1 3 and IPWM 40 80 If the PWM frequency is 1000 Hz t...

Страница 21: ...0 mA Out of range or broken wire The output will be switched off Feedback signal PIN 14 4 20 mA Out of range or broken wire The output will be switched off Solenoids on PIN 3 4 Wrong cabling broken wi...

Страница 22: ...ENABLE is active the READY LED is active no current to the solenoid no pressure build up To locate errors in the pressure control circuit it is useful to start with the open loop pressure control PIN...

Страница 23: ...to 0 disabled 7 ENABLE and START PIN 6 are active READY LED is ON the pressure control works but the pressure is not equal to the command input The system works generally but wrong control loop settin...

Страница 24: ...margin 3 The integrator time constant C I fixes the static error Typical values are 100 ms to 1200 ms Optimize this parameter by monitoring the transient response ENABLE and START PIN6 are active the...

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