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
b
a
100 %
100 %
Displac
emen
t
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
