Dither
Maximum current
Warning!
Do not set the current higher than the current limit of the coil used, as this may cause the coils to overheat, causing damage and
possibly fire.
The electronics have the maximum current in the coil limited to 3 A
effective value
, so the maximum current in the short-term,
peak operation, may be exceeded, typically when dithering with high amplitude and low frequency
is switched on.
EL7-I_Instructions_Hinweise_Pokyny_19151_3en_de_cz_07/2022
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Valve configuration
- depending on HW installation in the electronics, the item is for information only and cannot
be changed.
Frequency
- A pulse width modulated (PWM) signal is used as a output
control signal. Its frequency can be set in the range from
80 to 1000 Hz. The PWM signal reduces coil heating and
improves the dynamic of valve control.
The frequency is common for both coils.
- significantly reduces the effect of adhesive forces on
the solenoid armature and valve spool. The adhesive oil layer
counteracts the increasing solenoid force and thus prevents
movement in the range of low actuating current.
The permanent vibration of the armature, induced by current
pulses of high frequency and low amplitude through the coil,
significantly reduces the insensitivity zone. The frequency can
be set 60 to 300 Hz with an amplitude from 0 up to 30 %
of maximum coil current, for each coil separately.
When the dither function is switched on, the PWM frequency
of output control signal is automatically set to
the value 15 kHz.
- this function is used to protect the coil winding from current
overload, but can also be used to set limited coil power.
The maximum current value must not exceed the value
indicated on the coil housing. The maximum current of
the electronics is 3 A per coil.
7.4.4 Setting and adjusting output
