D 7831/1 page 4
4. Instructions for assembly and installation
4.1 Instructions for installation
These instructions apply to the target voltage range of 5V using internal stabilized voltage USt = 5 V.
Bridges (jumpers) in position as delivered (for other, conceivable bridge positions see section 5.1)
For assembly of printed circuit on card holder see section 6.
Note: Any external target voltage fed into the system must not be or become negative. Negative voltage may lead to malfunction
and destruction of the proportional amplifiers. When exceeding the maximum target voltage of 5, 10 or 15V DC, depending
on the bridge circuit, the current set Imax or Imax oper becomes ineffective, i.e. it increases beyond the threshold set.
When connecting wires more than 3 metres in length use wires with leads twisted in pairs in order to minimise interference
(and therefore to enhace resistance to interference).
Maximum coil voltage Imax set at the outlet may not in the long run exceed the Ilim limit specified for the proportional solenoid, since
otherwise the solenoid would be subjected to a thermal overload and might break down.
F1 = Fuse 2.5 A mT at EV1M2-12/24
Fuse 1.6 A mT at EV1M2-24/48
V1 = Voltmeter for measuring coil current,
100 mV & 0.5 A at EV1M2-12/24
100 mV & 0.2 A at EV1M2-24/48
TP1 = Test point 1
TP2 = Test point 2
P1 = Target value potentiometer 2 - 10 kΩ
(e.g. 5 kΩ, 2 W wire potentiometer, BÜRKLIN model No.: 72E 422)
;Amplifier connection:
Proportional solenoid to pins 2 and 3
Voltmeter V1 to test points TP1 and TP2 (for measuring coil voltage)
Target value potentiometer to pins 5, 6 and 7
Supply voltage to pins 4 and 8
< Set target value potentiometer for setting procedure @to minimum
(0 V) (ground side; pins 3, 4 and 5 are interconnected internally within
printed circuit)
= Pre-set dither amplitude (dither potentiometer in the middle)
> Set ramp times tdand tuto minimum (turn ramp potentiometer
anti-clockwise until reaching the stop position. Multi-potentiometer
(25 turns)
? Switch on supply voltage
@ Set Imin potentiometer to minimum current Iminoper which, in
accordance with the Q-l or |p-l curve of the proportional valve,
corresponds to its lower, desired terminal function point in
operation. See sect. 2.3.2 for the adjustable Imin range. Read
Imin oper from voltmeter V1 connected between test points TP1 and TP2,
applying a current scale of see above
A Set target value potentiometer for step Bto max. Read target value
voltage off voltmeter V2 (env. 5 V)
B Set Imax potentiometer to maximum current Imax oper which,
according to Q-l or |p-l curve of the proportional valve, corresponds to its
upper, desired terminal function point in operation. See section 2.3.2
for the adjustable Imax range
C Dither frequency f is set by the supplier to 55 Hz by means of
open bridge B3. In most cases this is sufficient. However, it may be
increased to 110 Hz by closing bridge B3, this setting being more
appropriate for relatively small proportional valves (fitted, for example,
with 25 "proportional solenoids)
Adjust potentiometer P1 to 0.5 x lmax (inductance current). To
determine the dither amplitude turn the ditherpotentiometer clockwise
until vibrations on the proportional valve can just be felt but without it
beginning to cause disturbances.
D Set ramp times tuand tdto the periods desired. In all cases ramp times
cover the entire range of output current IA. To speed up the setting-up
procedure see section 4.2
E Check the function parameters set: Imin oper (item @) at Utar = 0V DC;
Imaxoper (item B) at Utar = 5V DC, dither amplitude (item C) and ramp
times (item D). If necessary, repeat setting procedures.
Ramp up time tu
Ramp down time td
max. current Imax
min.current Imin
Dither
amplitude
Enable /
Disable
Target value po-
tentiometer P1
Proportional
solenoid
Supply from
vehicle battery
or mains con-
verter (e.g. MNG
2.5-230/24)
