HYDAC ENS 3000 User Manual

Electronic

Mat. no.: 669740 Edition: 12.07.2007

Level Switch

ENS 3000

Contents

Page

1. Functions of the ENS 3000 3

2. Installation 3

3. Commissioning 5

4. Operating controls of the ENS 3000 6

5. Digital display 6

6. Output signals

6.1. SWITCHING OUTPUTS 8

6.1.1 Switching point (SP) mode 8

6.1.2 Window (WIN) mode 8

6.2. ANALOGUE OUTPUT 9

6.3. SETTING THE SWITCHING POINTS AND HYSTERESES OR SWITCHING RANGES FOR THE WINDOW MODE 9

6.4.

6.5. SETTING RANGES FOR THE OFFSET 12

SETTING RANGES FOR SWITCHING OUTPUTS 11

7. Basic settings

7.1. ALTERING THE BASIC SETTINGS 13

7.2. SUMMARY OF THE BASIC SETTINGS 14

8. Re-setting the peak values 17

9. Programming enable

9.1.

9.2.

ALTERING THE OPERATING PROGRAMMING ENABLE ALTERING THE MAIN PROGRAMMING ENABLE 18

10. Error messages 19

11. Pin connection

11.1. PIN CONNECTION WITH 1 OR 2 SWITCHING POINTS

11.2. PIN CONNECTION WITH 4 SWITCHING POINTS 21

12. Technical specifications

12.1.

12.2. ENS 3000 WITH TEMPERATURE SENSOR 53

ENS 3000 WITHOUT TEMPERATURE SENSOR

13. Ordering information 54

14. Accessories

14.1. ELECTRICAL CONNECTION 25

14.2. MECHANICAL CONNECTION 27

15. Dimensions 28

16. Application examples 29

1. Functions of the ENS 3000

The unit has the following functions, depending on the model:

•

Display of the actual fluid level in

•

Display of the actual temperature in

•

Display of the lowest and peak value of the fluid level or temperature or of a pre-set switching point.

•

Switching of the switching outputs according to the fluid level or temperature and the pre-set switching parameters.

•

Analogue output.

•

Menu for basic settings (adapting the ENS 3000 to the particular application).

•

Two different types of programming enable.

inch

°F

or °C.

(depending on version).

2. Installation

The electronic level switch ENS 3000 should be fastened at the metal collar of the adaptor using a mounting device which grips as much of the metal collar as possible. Any device large enough to hold a metal collar of 0.866 inch diameter can be used. We recommend a bulkhead coupling with an integral cutting ring. In order to use the full measuring range the active zone of the probe must extend down into the tank and must be clear of the tank walls. If the active zone of the probe extends above the top edge of the metallic tank, then the useable measuring zone of the ENS 3000 is reduced. The function is not normally impaired.

Use HYDAC ELECTRONIC installation accessories for secure and simple fitting.

Warning:

The ENS 3000 electronic level switch is not suitable for operation at pressures exceeding atmospheric pressure. However, pressures of up to 40 psi are possible for up to 1 minute and will not damage the unit.

The following conditions must be met for safe operation of the ENS 3000:

•

When installing in small plastic tanks, the unit must be installed as near as possible to the centre of the tank.

• If the fluid is contaminated, the unit must be installed at a point where the fluid is turbulent (e.g. at the inlet/outlet)

•

When installing in metallic rising pipes (bypass line) the sensor must be mounted in the centre of the tube. The tube must have a concentric internal diameter and we recommend that the internal diameter is 2.36 inch in order to ensure correct operation.

•

Any metallic objects (e.g. metallic pipes or built-in components) inside the tank must be at least 2.36 inch away from the active zone of the sensor. Otherwise they will be recognised as mounting devices and the measurements will be distorted.

• When mounting in tanks, the distance between the sensor and the walls of the tank must be at least 0.787 inch.

•

To avoid any adverse effects on the measurements, which may be caused by the material of the tank top, the active zone must be approx. 1.77 inch below the top of the tank.

min. 1.77”

0.787”

2.36”

Additional installation suggestions which, from experience, reduce the effect of electromagnetic interference:

•

Make line connections as short as possible.

•

Use screened lines.

•

The cable screening must be fitted by qualified personnel subject to the ambient conditions and with the aim of suppressing interference.

•

Keep the unit well away from the electrical supply lines of power equipment, as well as from any electrical or electronic equipment causing interference.

There is an earthing screw on the mechanical adaptor which may be used as a functional earth terminal. If no earth connection is available because of the particular installation circumstances (e.g.: if the tank is plastic), the functional earth must be connected. We recommend using a 16 AWG cable and as short a line length as possible.

The level switch ENS 3000 must be installed as near to vertically as possible in the tank. If the ENS 3000 is not mounted vertically, then the accuracy of the ENS deteriorates with increasing angle of incline. (Additional inaccuracy if ENS is at an angle of 5°: approx. ±0.5% ; additional inaccuracy if at an angle of 10°: approx. ±1.5%).

3. Commissioning

Method of determining the offset value: We suggest the following procedure for determining the value of the fluid level offset (difficult when display is showing nTop or nMin): Start by installing the ENS 3000 in the tank, then check if the ENS 3000 is flashing or is showing a value greater than zero. If the display is flashing, the level is outside the active measuring zone (level too high or too low). If the level is too low, gradually increase the level – by adding fluid – until the value 0 is displayed. Then remove the ENS 3000 from the tank and use a measuring device to measure the depth of fluid inside the tank. Depending on the model, this depth is entered at menu point If the display is not flashing, or if the level is too high, gradually reduce the level – by draining the fluid – until the value 0 is shown in the display. After removing the ENS 3000 from the tank follow the procedure described above.

in “inch “ or “cm “.

Important:

Before commissioning select the type of fluid: oil or cooling lubricant. For the procedure, please see Point 7.2.

Note:

After detecting a valid measurement, the ENS 3000 with 4 switching points will check if faults are present in the active zone. If they are higher than the measurement detected it corrects them. After approx. 15 minutes these corrections are stored permanently, only

Menu point re-starts (see Point 7.2 Summary of the basic settings).

if the type of fluid is set as oil.

is used to reset faulty corrections and the learning phase

4. Operating keys of the ENS 3000

1 or 2 Switching points 4 Switching points

SP1

HYDAC

°C °F

indicates if temperature in °C or °F

4-digit digital display

Display indicating

mode

Keys for setting switching points, switch-back points and additional functions

SP2

fluid level unit (cm/inch)

LED-Display o the active switching point

HYDAC

°C °F

SP1

3 4

mode

Keys for setting switching points, switch-back points and additional functions

indicates if temperature in °C or °F

4-digit digital display

SP2

LED-Display of the active switching point

5. Digital display

After switching on the supply voltage, " display then indicates which parameter (fluid level or temperature) will be displayed and starts to indicate the actual value (basic setting).

For 1 or 2 Switching points

ENS

" appears briefly in the display. The

2s 2s 2s

For 4 Switching points

2s 2s 2s 2s

If the level exceeds or is lower than the measuring zone of the electronic level sensor, the following sequence is displayed:

For 1 or 2 Switching points

2s 2s 2s

Flashing displa

For 4 Switching points

2s 2s 2s 2s

Flashing displa

In the basic settings the display can be altered as follows:

•

Display of the peak fluid level measured "

n.TOP

Continuously displays the highest fluid level measured in the system since the unit was last switched on or reset.

•

Display of the lowest fluid level " Continuously displays the lowest fluid level measured in the system since the

unit was last switched on or reset.

•

Display of the actual temperature "

•

Display of the peak temperature" Continuously displays the highest temperature measured in the system since

the unit was last switched on or reset.

•

Display of the lowest temperature " Continuously displays the lowest temperature measured in the system since

the unit was last switched on or reset.

•

Display of the pre-set switching point "

S.P. 4

" Continuously displays one of the switching points 1 to 4, depending on the

model

•

Display off " Either " "

S.P. 3

oFF

n.TOP

", "

S.P. 4

" Display is switched off

", "

n.MIN

" or "

", "

oFF

TEMP

n.MIN

", "

" appears briefly in the display following the

TEMP

T.TOP

T.MIN

S.P. 1

T.TOP

", "

S.P. 2

", "

T.MIN

S.P. 1

", "

S.P. 3

", "

S.P. 2

", "

" or

switch-on message, depending on the setting that has been made. The ; or < key may be used to scroll through the above fluid levels and temperatures. If neither of these keys is pressed within approx. 5 seconds, the value of the parameter pre-set to appear in the display will be shown.

Notes:

•

If the actual fluid level exceeds the upper limit of the unit's nominal range, it can no longer be displayed and the display starts to flash. Either the peak fluid level that has been measured or the peak fluid level plus the pre-set offset, is then displayed.

•

If the actual fluid level falls below the lower limit of the unit's nominal range, it can no longer be displayed and the display will start to flash. Either "000" or the pre-set offset is then displayed.

• If the display has been set to "display the actual fluid level" it is possible to display first the peak fluid level by pressing the < key. Pressing the < key again will then, in turn, display the lowest fluid level, the actual temperature, the peak temperature, and the lowest temperature. The ; key can also be used to scroll through the above list, but in reverse.

fOffOff

6. Output signals

6.1 SWITCHING OUTPUTS

The ENS 3000 may have 1 or 2 or 4 switching outputs. The following output signals can be set using the basic settings:

6.1.1 Switching point (SP) mode

A switching point and a hysteresis can be assigned to each switching output. Each output will then switch as soon as its preset switching point has been reached and will switch back as soon as the switch-back point is reached. The switch-back point is determined by the pre-set hysteresis (switch-back point = switching point minus hysteresis).

Abbreviations "

6.1.2

Window mode (WIN)

: "

S.P.1 HyS.1

", " ", "

S.P.2 HyS.2

", " ", "

S.P.3 HyS.3

" , " " , "

S.P.4 HyS.4

" = switching point 1 to 4 " = hysteresis 1 to 4

Operating in window mode allows the unit to monitor a range. An upper and a lower switching point which defines the range can be assigned to each switching output. Each output will then switch whenever the fluid level or temperature enters that range and will switch back as soon as the fluid level or temperature exits that range. The lower switch back point of each such range is just below the lower switching value (1% FS below the lower limit; see Point 6.4). The upper switch back point of each such range is just above the upper switching value (1% FS above the upper limit, see Point 6.4). The area between the switching points and their associated switch back points forms a safety zone that will prevent unwanted switching operations. Example for switching output 1 (normally open):

Measured

value

hi.1 plus 1% FS

hi.1

safety zone

Switch-back value

Switchin

value

Lo.1 minus 1% FS

Lo.1

safety zone

Switching value

Switch-back value

Abbreviations:

HI 1

" to "

Lo 1

"to "

HI 4

Lo 4

" = High level 1 to 4 = upper switching point 1 to 4

" = Low level 1 to 4 = lower switching point 1 to 4

FS = Full Scale = relative to the full measuring range

Note:

The window function will only operate properly (switch on and off), if all switching values (including the safety zone) are over 0 inch or -9.4 °F (model with temperature sensor), and are within the unit's nominal measuring range.

→

6.2 ANALOGUE OUTPUT

The versions with 1 or 2 switching points can have an analogue output as an option. The output can be switched to either 4 .. 20 mA or 0 .. 10 V (corresponding to measuring range) via the basic menu and can be assigned to fluid level or to temperature (optional).

The versions with 4 switching points have two 0 .. 10 V analogue outputs. In this case fluid level and temperature are permanently assigned to an output.

6.3 SETTING THE SWITCHING POINTS AND HYSTERESES OR

SWITCHING RANGES FOR WINDOW MODE

•

Press the "

•

Either "

•

Press the "mode" key repeatedly to scroll through to the required parameter. (if switching point (SP) has been selected, "

hYS.4

" selected, "

•

After 2 seconds have elapsed, the actual setting will flash.

•

Use the ; and < keys to alter the setting.

•

If necessary, use the "mode" key to select further parameters and the

;

and < keys to alter their settings.

mode

S.P.1

" key.

" or "

Hi.1

" will appear in the display.

S.P.1

", "

hYS.1

" to "

S.P.4

"; will appear, in that order. If window (WIN) mode has been

Hi.1

", "

Lo.1

" to "

Hi.4

" and "

Lo.4

" will appear)

• If no key has been pressed for 3 seconds, the display will revert to displaying the primary display and the settings will be saved to the unit.

HYDAC

mode

press

until the required parameter appears

mode

key

→

display

→



actual setting

for switching point 1

HYDAC



mode

adjust the switching point = decrease setting

= increase setting

HYDAC

mode

For the version with 4 switching points, another menu point follows at this point:

HYDAC

actual



mode

display

Notes:

•

If " programming is disabled. Corrective action: Set the programming enable(s) to "

(see Point 9 "Programming enable")

•

If the ; key or < key is held down while changing a setting, the value will advance automatically.

•

Whenever any settings have been altered, " display when the display switches over. The new setting(s) have therefore

been saved to the unit.

LOC

" appears in the display when attempting to change a setting,

PROG

free

" appears briefly in the

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