Danfoss KE08102 Ramped Valve Drive Amplifier User Guide

Danfoss KE08102 Ramped Valve Drive Amplifier

Unit Specification

• Model: KE08102
• Product Type: +10 Volt Ramped Valve Drive Amplifier
• Maximum Output Current: 400 mA
• Supply Voltage: 12 Vdc
• Supply Current: 0.250 amp plus the load current
• Output Current : 0.300 amps maximum
• Accel/Decel: 1 to 15 seconds
• Input Impedance: 4 kilohm per channel

Electrical Characteristics

• Supply Voltage: 12 Vdc
• Supply Current : 0.250 amp plus the load current
• Output Current: 0.300 amps maximum
• Accel/Decel : 1 to 15 seconds
• Input Impedance : 4 kilohm per channel

Dimensions (in mm and inches)
Refer to the Dimensions drawing for detailed dimensions of the KE08102.

Product Usage Instructions

Installation

1. Ensure the pump EDC and motor EDC are connected properly.
2. If controlling only a pump EDC, install a 25 ohm, 3-watt load resistor across terminals 3 and 4.
3. Use a control handle or device that can produce 0 to +10 Volts for forward speeds and reverse speeds.

Adjustments
Refer to the Dimensions drawing for potentiometer locations for adjustments:

1. REV DEC – Adjust in conjunction with the +10 to 0 command input on pin 7.
2. FOR ACC – Adjust in conjunction with the 0 to +10 command input on pin 8.
3. DM – Adjust to match reverse output current with forward output current based on input voltage level commands.
4. REV ACC – Adjust in conjunction with the 0 to +10 command input on pin 7.
5. FOR DEC – Adjust in conjunction with the +10 to 0 command input on pin 8.
6. F-F – Adjust to set the maximum output current.

GENERAL DESCRIPTION

The function of the Ramped Valve Drive Amplifier is to take command voltage signals (0 to +10 Volts in terminal 8 for one direction and 0 to +10 Volts in terminal 7 for the other ) and limit the rate of output shaft speed change of a hydrostatic motor. The output of the controller produces 0 to 200 mA for the pump Electrical Displacement Controls (EDCs) and 0 to 150 mA for the variable motor EDCs. The pump EDC connection is automatically reversed as the speed decelerates to zero from one direction and starts to drive in the opposite direction. The pump and motor EDCs are connected in series. The first 0 to 90 mA produces only pump control. After reaching 95 mA and higher the pump stays at maximum and the motor progressively destrokes for higher speed. As the EDC current continues to increase, the pump EDC is clamped at about 150 mA by a bypass network.

The KE08102 is capable of producing a combined maximum output current of 400 mA (typically 0 to 200 mA to the pump EDC and 0 to 200 mA to the motor EDC). If only a pump EDC is being controlled, install a 25 ohm, 3-watt load resistor that should be connected across terminals 3 and 4.

The command inputs need to be separate such that both are positive voltage responses. A control handle or other device that can produce 0 to +10 Volts on one input for forward speeds and 0 to +10 Volts on the other input for reverse speed should be used. Input voltage could also be 0 to 5 Volts since the Volts are cut in half right away. Normal Accel/Decel control is maintained and the variable motor EDC control is retained as well.

ELECTRICAL CHARACTERISTICS

• SUPPLY VOLTAGE: 12 Vdc
• SUPPLY CURRENT: 0.250 amp plus the load current
• OUTPUT CURRENT: 0.300 amps maximum
• ACCEL/DECEL : 1 to 15 seconds
• INPUT IMPEDANCE: 4 kilohm per channel

ADJUSTMENTS

Reference the Dimensions drawing for the adjustment potentiometer locations. There are a total of 6 adjustments that may be required. These are as follows:

• 4 separate ACC and DEC ramp adjustments (1 to 15 seconds) in each direction:
  • REV DEC This is in conjunction with the +10 to 0 command input on pin 7
  • REV ACC This is in conjunction with 0 to +10 command input on pin 7
  • FOR DEC this is in conjunction with the +10 to 0 command input on pin 8
  • FOR ACC this is in conjunction with the 0 to +10 command input on pin 8
  • 2 adjustments affect the output current:
  • DM this allows the reverse output current to match the forward output current concerning the same input voltage level commands between inputs 7 and 8

F-F This allows the maximum output current to be set
All potentiometers are 20 turns. To increase the output, turn the potentiometer CW.

FAQ

• Q: What is the maximum output current of the KE08102?
  • A: The KE08102 is capable of producing a combined maximum output current of 400 mA (typically 0 to 200 mA to the pump EDC and 0 to 200 mA to the motor EDC).
• Q: What is the supply voltage for the KE08102?
  • A: The supply voltage for the KE08102 is 12 Vdc.
• Q: How many adjustments may be required for the KE08102?
  • A: There are a total of 6 adjustments that may be required, focusing on various parameters like acceleration, deceleration, and output current.

CONTACT

• ADDRESS: 3500 Annapolis Lane North, Minneapolis, MN 55447
• Telephone: 763-509-2084
• Telefax: 763-559-0108

© Danfoss, 2013-09

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