Danfoss 1090052 Installation guide
3500 Annapolis Lane North, Minneapolis, MN 55447
Phased Out Products
Telephone: (763) 509-2084 Telefax: (763) 559-0108
GENERAL DESCRIPTIO
Unit Specification
1090052
Amplifier, Foot Pedal
ISSUE: 1 DATE: June 1996
This amplifier is designed to work with the Danfoss foot pedal (KEP). A typical application would be controlling a
variable volume piston pump that is fitted with an Electrical Displacement Control (EDC). Trim pots on the amplifier allow the
output levels to be tailored with respect to foot pedal position. An enclosure protects the internal circuit board and provides
a means of mounting. The control has (3) LEDs to indicate +12 V power, +8 V regulator and output current.
DIMENSIONS
1992
ELECTRICAL CHARACTERISTICS
• Supply voltage: 12 Vdc (11 to 15 volts)
• Output current (uni-polar): maximum 160 mA with a 22
ohm load
• Adjustments (see Adjustments):
1.OFFSET sets start current (threshold)
2.MAX sets maximum current output
3.GAIN sets current output with respect to foot pedal
position
All adjustments are clockwise (< 1 turn) for increasing.
To access the adjustments, remove the 4 cover screws.
• Input impedence: 200K ohm
• EMI/RFI protection
© Danfoss, 2013-09 K20297 UNIT SPEC 1
ADJUSTMENTS
+12V POWER INDICATOR
CHASSIS GND
.
+12 VDC
OFFSET
SIGNAL GND
POWER GND
.
.
+8V REG INDICATOR
MAX
VALVE+
+8 V REG
VALVE GND
OUTPUT INDICATOR
INPUT
GAIN
CHASSIS GND
1995
TYPICAL WIRING CONNECTIONS
Phased Out Products
Controlling a Single Coil EDC Requires a Double Pole,
Double Throw (DPDT) Switch for Changing Direction.
+12Vdc
GROUND
EDC
FORWARD
REVERSE
ON
OFF
DPDT
SWITCH
1
2
3
4
5
6
7
+12V
GND
GND
VALVE –
VALVE +
+8V REG
INPUT
AMPLIFIER
1090052
1706
Controlling a Dual Coil EDC Requires a Single Pole,
Double Throw (SPDT) Switch for Changing Direction.
Also, Just One Coil of a Dual Coil can be Wired and
Switched as in Above Diagram.
+12V
1
GND
2
A
PV
B
EDC
C
D
When Controlling Two or Three EDCs, They must be
Wired Coils in Series/EDCs in Parallel as Shown in Diagram
Below. A Double Pole, Double Throw (DPDT) Switch is
Used for Changing Flow Direction of the PV.
A
PV
PV
EDC
B
C
D
PV
SWITCH
EDC
SPDT
A
B
C
D
Forward
Reverse
Forward
Reverse
DPDT
SWITCH
3
4
5
6
7
1
2
3
4
5
6
7
GND
VALVE –
VALVE +
+8V REG
INPUT
AMPLIFIER
1090052
+12V
GND
GND
VALVE –
VALVE +
+8V REG
INPUT
1993
AMPLIFIER
1090052
1994
2 K20297 UNIT SPEC © Danfoss, 2013-09
.
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