The EDC incorporates a positive neutral deadband as a result of the control spool porting, preloads from
the servo piston assembly, and the linear control spring. Once the neutral threshold current is reached,
the swashplate is positioned directly proportional to the control current. To minimize the effect of the
control neutral deadband, we recommend the transmission controller or operator input device
incorporate a jump up current to offset a portion of the neutral deadband.
The neutral position of the control spool does provide a positive preload pressure to each end of the
servo piston assembly.
When the control input signal is either lost or removed, or if there is a loss of charge pressure, the spring-
loaded servo piston will automatically return the pump to the neutral position.
Control Signal Requirements, EDC
Pump displacement vs. control current
"0"
-b -a
ba
100 %
100 %
Displacement
Current mA
EDC control current
Voltage 12 V
DC
24 V
DC
Minimum current to stroke pump a
*
640 mA 330 mA
b 1640 mA 820 mA
Pin connections any order
*
Factory test current, for vehicle movement or application actuation expect higher or lower value.
EDC Solenoid Data
Description 12 V 24 V
Maximum current 1800 mA 920 mA
Nominal coil resistance @ 20 °C [68 °F] 3.66 Ω 14.20 Ω
@ 80 °C [176 °F] 4.52 Ω 17.52 Ω
Inductance 33 mH 140 mH
PWM signal frequency Range 70 – 200 Hz
Recommended
*
100 Hz
IP Rating IEC 60 529 IP 67
DIN 40 050, part 9 IP 69K with mating connector
Connector color Black
*
PWM signal required for optimum control performance.
Service Manual
MP1
Operation
©
Danfoss | April 2019 AX00000244en-000201 | 15
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