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5. WIRING
EK
–, EH
–
–
devices:
EL
–, EM
–
–
devices:
6. OPERATION
The device must be connected to the protective earth with its internal or external
grounding screw! After energizing the supply terminals, the unit is fully
operational.
-
If the paddle is rotating freely (not immersed in the medium), the status
LED is green. When the medium reaches the paddle and stops it from
rotating, the output microswitch changes its state, the motor stops, and
the status LED turns red.
-
If the LED of the device is blinking, the supply voltage is too low for the
device to operate (
EL
–, EM
–
–4M, –8M
devices).
To adjust the sensitivity of
EK
–, EH
–
–
devices, the following
must be considered:
The spring provides reliable operation with mediums of different densities. The
default state of the sensitivity adjustment of the spring is position 1. This setting
is suitable for almost all applications. However, if the medium is wet, sticky, and
prone to form deposits on the paddle, it alters the sensitivity of the device
substantially, especially in horizontal or inclined positions. By adjusting the
spring tension (
SENSITIVITY 1–4
), the sensitivity of the device can be adjusted
to the desired level. Remember to clean the device regularly.
The sensitivity of
EL
–, EM
–
–
devices can be adjusted by
loosening the
SWITCHING FORCE
adjustment screw, moving the sensitivity
adjustment spring, then retightening the switching force screw.
The purpose of the switching force screw is to ensure the proper operation with
a great variety of materials. The default setting for the screw is the weakest.
This setting may be used for all applications. However, if the medium is wet,
sticky, and prone to form deposits on the paddle, it alters the sensitivity of the
device substantially, especially in horizontal or inclined positions. By adjusting
the
SWITCHING FORCE
, the sensitivity of the device can be adjusted better to
suit the application, device variant, and medium.
When the medium’s density or the grain size is not appropriate for the number of
blades, the medium may not be able to stop the rotation of the paddle.
Therefore, the output switch will not change its state despite the medium
reaching the paddle. By choosing the right paddle type and
SENSITIVITY
settings and
SWITCHING FORCE
according to the density of the medium,
reliable switching can be ensured in most cases. A custom-sized paddle is
required for very low-density materials.
Remember to clean the paddle regularly and occasionally the housing as
well!
Operation Status
Power Supply
Status LED
Paddle
Output
ON*
Green Rotates
NC
Red
Does not rotate
NO
OFF
Dark
Does not rotate
NC**
*EL
–, EM
–
–4M, –8M devices indicate low supply voltages by blinking the LED!
** The output of EK
–, EH
–
–
devices are not defined!
7. SPECIAL CONDITIONS OF EXPLOSION-PROOF USE
The housing cover may only be removed only in a de-energized state
and only after the necessary waiting time
(BKI11ATEX0026X Test certificate point 15.5)
The power supply and the output terminals may only be connected to
electrical circuits with short-circuit protection.
8. MAINTENANCE, REPAIR
The device does not require regular maintenance. In some instances, however,
the unit may need occasional cleaning to remove material deposits. All repairs
during or beyond the warranty period must be carried out at the manufacturer’s
premises.
9. STORAGE
Ambient temperature:
-30 °C … +60 °C (-22 °F … +140 °F)
Relative humidity:
maximum 98%
eka7021a0600h_06
January 2021
NIVELCO reserves the right to change technical specifications
without notice.