Electronic amplifier type EV1M2-12/24 and EV1M2-24/48
for controlling proportional valves
modular version to be connected via bolt-type terminals, SIL 2 acc. to ISO 61508-1
D 7831/1
Electronic amplifier
November 2011-00
HAWE HydrAulik SE
STREITFELDSTR. 25 • 81673 MÜNCHEN
5
© 1993 by HAWE Hydraulik
1. General
1.1
Brief description and block diagram
The amplifier has a very high control accuracy and can be used to control a
proportional solenoid.
EV1M2-12/24 from 12V DC to 24V DC and EV1 M 2-24/48 from 24V DC to 48V DC.
Main components:
Permanent voltage regulator for generating 5V DC stabilized voltage
linear ramp generator (integrator) with separate adjustment of rise and fall times
dither oscillator
Current-controlled, chopped terminal stage
Main features:
i
min
and i
max
standard and maximum current may be precisely adjusted by multi-gear
potentiometer.
Dither amplitude adjustable, dither frequency either 60 or 120 Hz.
Power supply secured against incorrect pole connection
Output protected against short cut and ground
dither signal superimposed on current output
Enable/disable input (making the ramp ineffective)
Improved EMC (electromagnetic compatibiIity)
In conjunction with the card holder available as an accessory, this printed circuit
with its compact dimensions fits conveniently on to 35 mm or 32 mm support rails in
electric cabinets. Thanks to the modular design the connections on an 8-piece pin bar
are clearly arranged and easily accessible from the front.
The amplifier fulfill Performance level Pl d and Safety integrity level Sil 2
Block diagram
This amplifier may be used for all HAWE proportional valves, see selection table in D 7810 Ü (over-view). With electro-hydraulic
remote control of PSL(V) directional valves as specified in D 7700-..., always make sure due to the twin proportional solenoids used
for switch positions A and B that, depending on the direction of control and activation, there is an automatic, electric switchover
to the respective solenoid, for example by a directional switch (micro-switch) in the remote control hand lever potentiometer, see
typical circuit diagram in sect. 5.2.
B4, TP3-TP6 are only in use when a coarse adjustment of the ramp times „rise“ and/or „fall“ on
the multi-range-potentiometers is carried out by measuring the voltage (see sect. 4.2).
TP1, TP2 test points for measuring the coil (inductive) current 100 mV
&
0.5 A (100 mV
&
0.2A)
1
) Values in brackets valid for
EV1M2-24/48
u
nom.
up
down
Enable/disable
http://www.hawe.de/en/products/by-category/electronics/
Technical support
Phone: + 49 (0) 89 / 37 91 00 - 1256
E-mail: [email protected]
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