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RA 29 957/10.92
Electronic Amplifier Model VT 5036 (Series 1X)
for Electrical Proportional Flow Control
of Variable Dispalcement Axial Piston Pump
AA10VSO, Euro Card Format
RA
29 957/10.92
Replaces: 03.87
Electronic amplifier cards Model VT 5036 (series 1X) for proportional
flow control of axis piston pump Model AA10VSO … FE, FED.
They incorporate the following features:
– Voltage stabilizer to provide a constant voltage for consistent
performance
– Pulse width modulated output which provides a dither effect
to reduce hysteresis, this also allows high ambient temperature ranges
– Ramp generator which provides the ability to control the rate
(signal vs. time) at which the pump control response, for both
on and off stroke
– 10 V differential amplifier input which enables interface with
programmable controllers, microprocessors, or computers
– Factory calibrated and optimized PID control to match each
valve type, therby simplifying installation or replacement
– Inductive feedback circuitry to provide excellent valve
repeatability and performance
F 87018
VT 5036 S 1X/.E
– Face plate mounted switch or internal contact relay to disable
the ramp function
Matching card holders
– VT 3002-1X, see RA 29 916
single card holder
– CH 32C-1X, see RA 29 921
Technical Data
Power supply voltage
Input control voltage
VDC: 24 Veff ± 10 %
VIN : ± 9 V
with reference to (M0)
RIN : ≥ 500 Ω
R : 12 Ω
Minimum input load
Max. output load
(coil resistance)
Max. output current
Imax: 700 mA
Output current min. stroke
I : approx. 400 mA
Power requirements
P : 20 W
Oscillator frequency (LVDT) Fosc : ~ 2.5 kHz
Frequency range
f : 250 Hz
(output stages)
IS: 2.5 Ampere M
Fuse (5 mm x 20 mm)
Ambient temperature range
T: 32 to 122 °F (0 to 50 °C)
Card dimensions
Euro card DIN 41 494
Space requirements
Conductor side of card
1 division
Component side of card
7 divisions
Face plate requirement
8 divisions
1 div. = 0.200" (5.08 mm)
= 1 TE = 1 HP
W : 0.33 lb (0.15 kg)
Weight (approx.)
For applications outside these parameters, please consult us!
1
28c
signal
value
Ramp “off”
BU2
Input voltage
(signal value)
0 to +6 V
30c
Manual
control
32c
d1
Displacement
command value
+9V
+6V
3
3a
26c
1
Differential
input (10 V) – refer- 24c
ence
I
4
32a
=
~
~
P3
BU1
=
–9V
M0
6
14ac
Feedback
(actual value)
0 to –6 V
18ac
16ac
+9V
4ac
V
11
actual value
2ac
2
P1 P2
V
3c
V
PD
24a
+10 V 22a
3b
28a
2
20c
1
9
12c
22c
K
20c
1
14c
2
Power supply inputs
+ 24 V
+ 24 V
0V
Measured zero (or signal common) pin 18ac (M0) is
raised + 9 V with respect to zero volt line pin 10ac 0V
of the supply voltage!
8ac
6ac
10ac
P1 = Ramp time adjusrment "up"
P2 = Ramp time adjusrment "down"
P3 = “Zero” adjustment for feedback
d1 = Contact relay ramp “on” or “off”
IW9
12c
L0
Relay supply
+ 24 V
Note: For counter-clockwise
pump rotation, connect
according to diagram below!
7
10
D1
IW9
14c
L0
5
LED lights
for cable break
L0
d1
~
~
22c
2.5 A
=
Differential Input Amp (11)
8
1 Ramp generator
2 PD regulator
3a Power amplifier
3b PMW oscillator
3c Output stage
4 Oscillator
5 Demodulator
60.4K
6
7
8
9
10
11
Matching amplifier
Cable break detector
Voltage regulator
Inductive positional transducer (LVDT)
Cable break LED
Differential input amplifier
Com
+10 V
24c 100K
–
22a 100K
+
60.4K
RA 29 957/10.92
Inputs
Terminal Connection VT 5036 S1X
2
Test points
BU2 = Input voltage 0 to +6 V (signal value)
BU1 = Feedback voltage 0 to –6 V (actual value)
RA 29 957/10.92
Example of manual controls with 5kΩ potentiometer External ramp time potentiometer
500 K
+ 9 V:
26c
5K
30c
32c
Externally ramp
adjustable
18ac
16ac
30c
Ramps “on” or “off”
Pin 16ac
32c
Functional description
Amplifier card Model VT 5036 converts an input voltage signal
proportionally into output current to power a proportional solenoid. Dependent on the amount of current to the solenoid, the
force is proportionally transmitted to the pumps proportional flow
control valve. These electronic amplifiers control pumps Model
AA10VSO with controls type FE with swashplate positional feedback for excellent accuracy and repeatability.
The input voltage from the power supply on pins 6ac and 10ac
powers the card and is also fed through a voltage regulator (8)
which filters, suppresses and smooths the voltage and divides its
18 V output over pins 14ac and 16ac with reference potential to
“measured zero” on pin 18ac. From pin 16ac the +9 volts may be
manipulated externally via a simple potentiometer (see above),
reed switches, dry circuit relays etc., and then used as command
input signal to the amplifier at pin 26c.
The card will also accept a differential analog input via pins 22a
and 24c. The differential signal is compared in the differential
amplifier (11) and then the differential voltage is output. Pin 22a
must have a 0–10 volt potential with respect to pin 24c and the
signal to both pins must be made or broken simultaneously. An
optional external +6 V input command may be used at pin 24a.
The ramp generator (1) distributes a stepped input signal into a
slowly increasing output signal over an adjustable period of time.
The time or “slope” of the output signal curve may be adjusted for
both “up” and “down” ramps. These potentiometers are adjustable from the cards face plate and allow signal vs. time ramping
of up to 5 seconds. A clockwise rotation of trim pot will increase
the ramp time. In addition, a face plate mounted switch, or internal
contact relay “d1” allows the ramps to be switched “off” or “on”
when desired.
After the inputs and outputs are connected, the input voltage at pin
26c is passed to the ramp generator (1); the output signal of the
ramp generator (1) then travels to the PD loop (2). The oscillator
(4) converts a DC signal into AC voltage (frequency 2.5 kHz) which
is used at the inductive positional transducer [LVDT (9)]. The
output voltage from the LVDT is varied depending on the position
of the pumps swashplate, then the resulting output is feedback to
the demodulator (5) where the AC voltage is converted back to DC
voltage. The matching amplifier (6) amplifies the feedback voltage
from demodulator (5) and limits its maximum value to –6 V, then
inputs this value (actual value) to the PD loop (2) where it is
compared with the output signal (signal value) from the ramp
generator (1). A resulting signal is produced from the differential
between the signal value and the actual value. The cable break
detector (7) continuously monitors the cable connection of the
feedback. In the case of a cable break, the LED (10), located on
the face plate, provides visual indication that the feedback wires
have been disconnected.
A combined signal is then transmitted to the power amplifier (3a).
Through modulation of the PMW oscillator (3b), a pulse width is
generated, which in turn is used to switch the output stage (3c).
The output signal travels through the output stage (3c) supplying
a current of up to 700 mA to the proportional solenoid. Two test
points, BU1 and BU2, are located on the face plate of the card. The
input voltage (signal value) 0 to +6 V may be measured across test
points BU2 to ensure the input is correct. Likewise, the feedback
voltage (actual value) may be easily checked using test points
BU1.
An optional external potentiometer may be connected to allow
external adjustment (see above). P1 and P2 potentiometers with
an external adjustment act as limiters. Note, the maximum ramp
time of 5 seconds can only be achieved over a full voltage range,
if a lower command signal < +9 V is selected then the ramp time
will be correspondingly reduced.
3
RA 29 957/10.92
Ordering Code
VT 5036
S 1X / R5 E
*
Further detailsto be written in clear text
32 pin plug-in Euro card design
(for installation in Euro-magazines or card holders)
=S
Series 10 to 19
= 1X
∧
(10 to 19: = installation and connection dim. remain unchanged)
E=
English name plate
R5 =
Ramp time adjustable from 0.03 to 5 sec.
Additional information
– Turn off power before connecting or disconnecting the amplifier card.
– Measurements to be made with a high impedence meter!
– Signal common or, measured zero (M0) is regulated above 9 V with respect to 0 V power supply, therefore, “M0” may not be
connected to “0 V” of power supply voltage, or externally grounded!
– Radio transmitters or similar devices should not be used within 3 ft (1 m) of this card!
– Switches used for input signals must handle currents under 1 mA (dry circuit contacts, reed switches).
– Shield all control voltage and feedback wires, connect the card end of shield to panel ground on the enclosure and leave one
end of the shield open.
– Do not run the solenoid wires in the vicinity of power wires!
– Input and output terminals which are labeled with the suffix “ac” are internally connected, therefore connections may be made
to either terminals “a” or “c”.
– When using K1, terminal 8ac may be used as the voltage supply line. However, a 24 V DC output may also be used.
– If during start-up the valve shifts “fully over” and there is no control, the feedback connections are probably reversed.
– If instability occurs, bleed the air from the solenoids with electronics deactivated!
5.03 (128)
Unit dimensions: dimensions in inches (millimeters)
REXROTH
Prop. Amplifier
Cable break
Off
Ramp
On
Actual
input
Rack location window
1
2
3
4
Up
Ramp time
5
Down
VT
5036
5.03 (128)
1.57
(40)
0.27 (7)
1 LED indicator for cable break
0.43
(11)
7.32 (186)
6.77 (172)
0.27
(7)
0.07
(2)
2 Ramp “on” or “off” switch
3 Test point 1: Feedback (actual voltage)
0…–6V
4 Test point 2: Input (signal voltage)
0…+6V
5 Ramp time setting from 0.03 to 5 sec
“up” – “down”
6.77 (172)
0.09
(2.5)
0.59 (15)
R5
3.50 (89)
3.93 (100)
Mannesmann Rexroth Corporation
Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467
Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333
4
All rights reserved - Subject to revision
Printed in U.S.A.