EKOM 447000001-066, User Manual

Page: 56 / 72

PRODUCT MAINTENANCE
NP-DK50-9x4VRTM-AD-EN-5_04-2022 56 04/2022
18.11. Check of solenoid valve operation
Check their operation using the:
“Magnetic indicator” fixture as follows:
•
Attach the fixture to the valve coil and if
the motors are active at the valve coil,
the indicator must rotate and if they are
out of inactive, the indicator must not
rotate.
Fig. 32: Check of solenoid valve operation
18.12. Check of temperature sensor
switching
Checking the functionality of temperature
sensor B3 (external) and B4 (internal).
The B4 sensor is only used on covered
models.
•
This check is conducted using the
LOGO! TDE display where the
instantaneous temperature values are
shown on the starting screen in STOP
mode.
•
The check is based on a slight change
in temperature around the sensor, i.e.
caused by heating, or the temperature
shown on the display must also
change. The B4 sensor is not
connected on uncovered versions and
the display shows N/A.
Fig. 33: Check of temperature switch switching
18.13. Check the function of the
pressure sensor
This check is performed visually using the
TDE screen, which shows the compressed air
value. The pressure level shown on the
display must change with changes in air
demand.
18.14. Cleaning and disinfection of the
exterior surfaces of the product
Clean and disinfect the exterior surfaces with
neutral cleaning products.
Use of aggressive detergents and
disinfectants containing alcohol
and chlorides can lead to surface
damage and discolouration.
AD dryer maintenance
18.15. Venting pressure from the dryer
The equipment is designed to permit the safe
venting of pressure within 10 seconds after
the compressor is shut off.
If pressure is not automatically vented from
the dryer, then the pressure may be vented
manually.