Argo-Hytos EL7-I Series, Instruction Manual

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Dither
Maximum current
EL7-I_Pokyny_Instructions_Hinweise_19151_1en_de_cz_04/2021
Page 15
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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
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.