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Power Amplifiers for Proportional Valves [1]
24V power supply input, green
[2]
15V control supply output, green
[3]
Output (solenoid) enabled, yellow
[4]
Overload, red
[5]
LVDT failure, red
[6]
Output level to solenoid, yellow
[7]
Deadband compensation; towards flow from main-stage
service port (A or B) nearest LVDT
[8]
Deadband compensation; towards flow from main-stage
service port (B or A) furthest from LVDT
[9]
Gain; flow from service port (A or B) nearest LVDT
[10] Gain; flow from service port (B or A) furthest from LVDT
[11] Ramp
J
Ø 2 (0.0787 dia.) sockets
Front Panel
Potentiometers
LEDs
[12] Monitor point
J
, conditioned command signal
[13] Common ground (0V)
J
[14] Monitor point
J
, LVDT (spool) position
t
t
24V
15V
t
February 1996
GB-2101A
Power Amplifiers for Proportional
Valves
EEA-PAM-56*-A-14 Design
EEA-PAM-561-A-14 for use with valve
types:
KDG5V-5, 3* and KDG5V-7, 1* series
EEA-PAM-568-A-14 for use with valve
types:
KDG5V-8, 1* series
General Description
This basic amplifier is designed for
driving Vickers type KFDG5V-5/7/8,
2-stage proportional valves in
applications requiring only one
(adjustable) ramp setting for both
acceleration and deceleration.
Analog command input signals can be
non-inverting current, or non-inverting,
inverting or differential voltages. The
amplifier requires a power supply of 24V
DC and is enabled by a 24V logic signal.
The ramp is normally enabled but can
be selectively disabled by suitable wiring
to an external switch.
The amplifier front panel contains LEDs
showing the status of power, control
supply and outputs. Potentiometers for
adjusting ramp, deadband
compensation and gain are also
mounted in the front panel.
Features
F
Basic valve amplifier
F
Voltage and current command signals
F
1 ramp for acceleration and
deceleration
F
24V DC power supply
F
Pulse-width-modulated coil drives
14-design Features
F
Wider supply voltage range plus
increased tolerance to ripple
F
Low supply voltage protection
F
Additional monitor points on edge
connector
F
Gain re-positioned in circuitry to give:
Ramp setting unaffected by gain
adjustment
Constant trigger voltage for
deadband compensation
Warning: Electromagnetic Compatibility (EMC)
This product does not conform to the European Community directives for electromagnetic compatibility (EMC). It is only suitable
for use within the European Economic Area in a sealed electromagnetic environment or as a spare for an existing machine.
(Ref. UK Electromagnetic Compatibility Regulations 14 & 18, 1995.)
Vickers
®
Amplifier Cards Pin 4
Pin 2
Pin 1
Pin 3
Valve Wiring Connections
Solenoid Connections
z26 (or z28)
z28 (or z26)
No
connection
LVDT plug pin
Amplifier pin
1
b14
2
z22
3
b16
4
Not connected
Note: Connections not polarity sensitive
LVDT Connections
2
Operating Data
Power (input) supply
20 to 34V DC x 40W max.
24V DC nominal
<4V pk-to-pk ripple
Amplifier shuts down below 19V
Control (output) supplies:
z22
z2
b2
+15V x 50 mA max. in addition to LVDT
demand
+10V x 5 mA max.
10V x 5 mA max.
Command signal inputs:
Direct voltage pins
b8, b6, z8, b10
Inverting voltage pin
z10
Voltage range
Input impedance (voltage)
Current pin
z6
Current range
Input impedance (current)
"10V
47 k "20 mA
100 Standing solenoid current at zero
command signal
Note: A positive signal to a non-inverting
signal pin reduces solenoid current
1,4A
Deadband compensation, separate
controls for each direction from
spool-centered position:
Factory setting
Adjustment per direction from
centered position
10% of max. stroke
Y
0 to 50% of max. stroke
Y
Gain, separate controls for each
direction from spool-centered position:
Factory setting
Adjustment per direction from
centered position
Max. spool stroke at 10V command
signal
Y
1,9 to 20% of max. spool stroke per
1 volt
Y
Ramp time adjustment, linear:
Factory setting
Adjustment range
Max. time
50 ms to 2s, under pre-set deadband
compensation and gain conditions
specified above
Dither
Factory-set
Feedback from LVDT to b14
4 to 20 mA (100
)
Overload protection, factory-set
Automatic reset when fault removed
Output enabled (power available to
solenoid)
z24
Apply 10 to 30V (6.8 k
)
Output disabled (no power output to
solenoid)
z24
Apply
v0,8V or open circuit
Ramp enabled (machine actuator
acceleration and deceleration limited by
ramp potentiometer)
b12, b20
Open circuit between b20 and b12
Y
From spool-centered position
Continued on next page 3
Ramp disabled (fastest acceleration and
deceleration of machine actuator; ramp
circuit bypassed)
b12, b20
Link b20 to b12
Command signal monitor point
"5V full scale. Command signal
conditioned by deadband
compensation, gain and ramp functions
Spool position monitor point
front panel and z18
"5V full scale
Monitor point impedance
front panel and b18
10 k Monitor point protection
Short-circuit protected
Output point to alarm indicator
z12
>+6V when enabled
<6V when disabled
Ambient temperature range
0 to 50
_C (32 to 122_F)
Mass
0,22 kg (0.48 lb)
Supporting products:
Power supply unit options
Electronic accessories
Portable test equipment
See catalogs:
2419
2460
2462 and 2315 Deadband
compensation
b20
b12
b18
z18
+24V
24V
15V
47 k
W
+10V; 5 mA
+15V; 50 mA
10V; 5 mA
Output enable
Power zero
24V DC
power
supply
Monitor drive output
Close to enable
output
Overload
low voltage
Output
enable
PWM
Dither
zbd32
z12
zbd30
z24
z22
b14
z2
b2
z6
b6
b8
b10
z8
z10
b4
z4
z22
Voltage
commands
Control
zero
Ramp
enable
Current command
100
W
Gain
Ramp
Inv. voltage
Link to
disable
ramp
Command signal
monitor point
(conditioned) on
front panel
LVDT signal
monitor point
on front panel +
z26
z28
Power
stage
Output
A
A
B
B
bz16
LVDT fail
Cable
screen
b16
Current
sensing
4
Circuit and Connections
Command Signals and Outputs
Command signals
Valve flow
Type
Input pins
Secondary pins ref.
Ref.
Signal polarity
Non-inverting voltages
b6/8/10 or z8
)
P-B
g
g
b6/8/10 or z8
*
bz4
P-A
Non-inverting current
z6
)
bz4
P-B
g
z6
*
P-A
Inverting voltage
*
Link one of b6/8/10 or z8 to bz4
P-B
g
g
z10
)
Link one of b6/8/10 or z8 to bz4
P-A
Differential voltage
z10
*
One of b6/8/10 or z8
P-B
g
)
One of b6/8/10 or z8
P-A
One of b6/8/10 or z8
)
z10
P-B
One of b6/8/10 or z8
*
z10
P-A 3rd angle
projection
Plug-in Unit of 3U Height, to IEC 297
14
(0.55)
14,2 (0.56)
7,2
(0.28)
8 (0.31)
2,5
(0.1)
Components envelope
z - pin row
b - pin row
d - pin row
7,92
(0.31)
DIN 41612 F48 male connector
100
(3.94)
175,24
(6.90)
128,4
(5.06)
7,45
(0.29)
3
(0.12)
3
(0.12)
Model
designation
M2,5 x 11 (0.43) long collar
screws supplied with panel for
fixing
40,3
(1.59)
122,4
(4.82)
5
Installation Dimensions
mm (inches)