Continental Hydraulics CEM-PA-B Installation Manual

Continental Hydraulics Installation Manual

CEM-PA-B

Product Description:

This closed loop PID amplifier, drives a single solenoid proportional pressure or flow
control valve coil up to 2.6A. It is suitable to provide precise closed loop control in
pressure, force, or velocity systems. This module uses traditional PID error correction to
provide stable control in dynamic systems.

A wide range of analog signals are accepted. User may select either voltage or current
input mode. These inputs are easily scaled to match 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 adjustable. Output characteristics can be independently
customized. The module is disabled if the coil outputs are shorted or open. If command
current signal is outside of the proper range, the module is disabled. PWM and Dither
are user adjustable.

This module is easily adapted to a variety of system requirements. All variables are user
adjusted with easy to use software on your Microsoft Windows laptop. Control variables
are stored in non-volatile memory internal to the module. All variables can be read by
the laptop, and reproduced exactly on other modules.

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Continental Hydraulics Installation Manual

Table of Contents

Information Description Page #

Technical Data ………………………………………………………………….. 3
Steps to install and configure a new application ……………………………. 4-5
Module Mounting Location …………………………………………………….. 5
Power Supply …………………………………………………………………… 5
Wiring to Valve ………………………………………………………………….. 5
Circuit 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)……………………………………… 11-12
 N_RANGE:X …………………………………………………………….. 13
 OFFSET:X ……………………………………………………………….. 13
 RA:UP / RA:DOWN (Ramp times) …………………………………….. 14
 C:P, C:I, C:D, C:D_TI, C:D_FF ………………………………………… 15
 C:I_LIM / C:I_ACT ………………………………………………………. 16
 MIN ………………………………………………………………………... 17
 MAX ………………………………………………………………………. 17
 TRIGGER ………………………………………………………………… 17
 SIGNAL:U ………………………………………………………………… 18
 CURRENT ……………………………………………………………….. 18
 DFREQ / DAMPL ………………………………………………………... 18
 PWM ……………………………………………………………………… 19
 ACC ………………………………………………………………………. 19
 PPWM / IPWM …………………………………………………………… 20

Process Data (Monitoring) ……………………………………………………… 20
Failure Monitoring ……………………………………………………………….. 21
Troubleshooting …………………………………………………………………. 22-24

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Technical data

Supply voltage [VDC] 12… 30 (incl. ripple)

Current requirement [mA] 60 + solenoid current

External protection [A] 3 medium time lag

Reference voltage [V] 8 (max. 25 mA load)

Digital inputs [V] logic 0: < 2

[V] logic 1: > 10

Input resistance [kOhm] 25

[V] logic 0: < 2

[V] logic 1: > 12 (50 mA)

Analogue inputs:

Command value [V] 0… 10; 150 kOhm

[mA] 4… 20; 390 Ohm

Signal resolution [%] 0.006 incl. Oversampling

Sensor value [V] 0… 10; 90 kOhm

[mA] 4… 20; 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 current
control)

[ms] 0.125

USB type B

Virtual COM port driver (CHI-PC):

9600… 57600 Baud (Default = 57600),

1 Stop bit, No parity, No handshake

Snap-on module to EN 50022

PA 6.6 polyamide

Flammability class V0 (UL94)

Weight [kg] 0,190

Protection class IP20

Temperature range [°C] -20… 60

Storage temperature [°C] -20… 70

Humidity [%] < 95 (non-condensing)

USB Typ B

4 x 4-pole terminal blocks

PE: via the DIN mounting rail

EN 61000-6-2: 8/2005

EN 61000-6-4: 6/2007 + A1:2011

EMC

Digital outputs

Serial interface
Housing

Connections

Continental Hydraulics Installation Manual

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Continental Hydraulics Installation Manual

Steps to install and configure a new application:

All parameters are adjusted using VEA-BUSB-A programming cable and CHI-PC Microsoft
Windows application.

1. Mount the module in suitable location. See page 5.

2. Connect the power supply, valve connections and enable.

3. Download and open the GUI program (www.continentalhydraulics.com/wp-

content/uploads/2015/01/setup-CEWMPC-10-v3.5.0.zip)

4. Connect to laptop via USB to USB Type B communication cable.

5. Select com port in upper left hand corner of 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 Button.

9. Adjust CURRENT parameter to match the nominal solenoid current.

10. Adjust dither amplitude, DAMPL, and dither frequency, DFREQ, to optimize performance
of valve.

11. Set the SIGNAL type to voltage (0-10V) or current (4-20ma). See ANIMODE if the
signals are other than standard. Some scaling may be required.

12. Set the MIN, MAX, and TRIGGER, for the desired system output.

13. Adjust the SYS_RANGE to the pressure output of the valve at rated current. For
example, the Continental model VER03M-210-A-K1-24D is rated for 210 bar. Set the
SYS_RANGE X to 210. The units on this parameter is bar.

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14. Set the N_RANGE:X to the maximum pressure rating of the pressure sensor. For a 0­210 bar pressure transducer, set N_RANGE:X to 210 bar. This setting should be the
same or greater than the SYS_RANGE value.

15. Use the OFFSET:X to compensate for the pressure transducer reading at actual 0bar
pressure.

16. Adjust RAMP as required.

17. Set internal monitor function, SENS, as required.

18. Adjust PID error correction parameters, (C:P, C:I, C:D, C:D_TI, C:FF), to tune the
system performance.

Module Mounting Location:

This module is to be mounted in a cabinet for protection from the local environment.
Ensure there is adequate free space around the module to allow for cooling air flow.
This module is designed to snap onto an industry standard 35mm DIN rail.
Do not mount near other modules that emit high power electrical interference, such as
motor controllers and high power contactors.

Power Supply:

This module is designed to operate on DC power from a regulated power supply ranging
from 12 to 30 volts. Match valve solenoid voltage rating to power supply, typically 12 or
24 volts. A 3 amp medium action fuse is recommended in the “+” power supply line.

Wiring to Valve:

Two conductors are required for each solenoid. There is 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 24v applications.
The listed cable length is distance from module to valve, and includes the voltage drop
of the return conductor.

Wire size 2.6A 12v 1.6A 24v 0.86A 24v
12 gauge 66 ft. max 215 ft. max 400 ft. max
14 gauge 49 ft. max 159 ft. max 295 ft. max
16 gauge 31 ft. max 100 ft. max 186 ft. max
18 gauge 19 ft. max 63 ft. max 117 ft. max
20 gauge 13 ft. max 39 ft. max 73 ft. max
22 gauge 8 ft. max 25 ft. max 46 ft. max

All analog input signal cables must be shielded!

Good analog system design requires that all analog signals in an electrically noisy
environment be shielded. Long wires act like antennas that pick up analog noise. The
wire connecting the analog command source to command this module must be shielded!
Shielding a noise sensitive wire is accomplished by wrapping a noise blocking foil or
braided shield around the signal wire. This shield must be grounded at only one end,
usually the end that sends the signal. A control cable may have many individual
conductors. The conductors may be shielded individually, or may be shielded as a
group. Short signal wires in electrically quiet environments may not need to be shielded.
The CEM family of modules all have an internal ground connection to the DIN rail. For
this module ground to be effective, please insure the DIN rail is properly grounded.

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Circuit Diagram

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LED Definitions

LEDs Description of the LED function

Identical to the READY output.

OFF: No power supply or ENABLE is not activated

ON: System is ready for peration

Flashing: Error discovered

Only active when SENS = ON

YELLOW A

Intensity of the solenoid current

1. Chasing light (over all LEDs): The bootloader is active. No
normal functions are possible.

2. All LEDs flash shortly every 6 s: An internal data error was
detected and corrected automatically! The module still works
regularly. To acknowledge the error the module has to be cycle
powered.

YELLOW A +
YELLOW B

Both yellow LEDs flash oppositely every 1 s: The nonvolatile stored
parameters 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

Connection Supply

PIN 7 Power supply (see technical data)

PIN 8 0 V (GND) connection.

Connection Analogue signals

PIN 9 / 10

Pressure com m and value (WA), signal range 0… 10 V or 4… 20 mA,

scalable (SIGNAL W)

PIN 13 /14

Pressure feedback value (X), signal range 0… 10 V or 4… 20 mA,

scalable (SIGNAL X)

PIN 11 0 V (GND) connection for analogue signals

PIN 12 8V reference voltage output

PIN 3 / 4 PWM output to the solenoid

Connection Digital inputs and outputs

Enable input:

Generally enabling of the application.

RUN (Start) Input:

ON: The controller is active.

OFF: The controller is not active.

READY output:

ON: The module is enabled; there are no discernable errors.

OFF: ENABLE (PIN 15) is not active or an error has been detected.

PIN 15

PIN 6

PIN 5

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CEM-PA-B Function Parameter layout

Ref Page Command Parameter Help / Description STD EXP

9 LG EN EN English X X
9 MODE EXP Standard / Expert mode X X

9 SENS AUTO Malfunction monitoring [ON / OFF /AUTO] X X
10 EOUT 0 Output signal if not ready [0.01%] X
10 SYS_RANGE 100 System pressure [bar] X X
10 SIGNAL:X U0-10 Type of Input X X
13 N_RANGE:X 100 Sensor nominal pressure [bar] X X
13 OFFSET:X 0 Sensor offset [mbar] X X
10 SIGNAL:W U0-10 Type of Input X X
14 RA:UP 100 Command signal ramp time [ms] X X
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%] X X
16 C:I_LIM 2500 Integrator limitation [0.01%] X X
16 C:I_ACT 2500 Integrator activation threshold [0.01%] X X
17 MIN 0 Deadband compensation [0.01%] X X
17 MAX 10000 Output Scaling [0.01%] X X
17 TRIGGER 200 Trigger point of the MIN function in 0.01% X X
18 SIGNAL:U + Output polarity X X
18 CURRENT 1000 Rated solenoid current [mA] X X
18 DFREQ 121 Dither frequency [Hz] X X
18 DAMPL 500 Dither amplitude [0.01%] X X
19 PWM 2604 PWM frequency [Hz] X X
19 ACC ON Auto Adjustment of the current loop [OFF / ON] X
20 PPWM 7 P-Gain of the current loop X
20 IPWM 40 I-Gain of the current loop X

MODE

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