Danfoss H1 Series Technical Information

Also see for H1 Series: Service manual Technical information Technical information Technical information Technical information

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MDC General InformationIn difference to other controls the MDC provides a mechanical deadband. This is required to overcomethe tolerances in the mechanical actuation.The MDC contains an internal end stop to prevent over travel. The restoring moment is appropriate forturning the MDC input shaft back to neutral only. Any linkages or cables may prevent the MDC fromreturning to neutral.The MDC is designed for a maximum case pressure of 5 bar and a rated case pressure of 3 bar. If the casepressure exceeds 5 bar there is a risk of an insufficient restoring moment. In addition a high case pressurecan cause the NSS to indicate that the control is not in neutral. High case pressure may cause excessivewear.Customers can apply their own handle design but they must care about a robust clamping connectionbetween their handle and the control shaft and avoid overload of the shaft.Customers can connect two MDC’s on a tandem unit in such a way that the actuation force will betransferred from the pilot control to the second control but the kinematic of the linkages must ensurethat either control shaft is protected from torque overload. To avoid an overload of the MDC, customersmust install any support to limit the setting range of the Bowden cable.C CautionUsing the internal spring force on the input shaft is not an appropriate way to return the customerconnection linkage to neutral.MDC Shaft RotationCCWCWP301 753MDC shaft rotation dataPump shaft rotation* Clock Wise (CW) Counter Clock Wise (CCW)MDC shaft rotation CW CCW CW CCWPort A in (low) out (high) out (high) in (low)Port B out (high) in (low) in (low) out (high)Servo port high pressure M5 M4 M5 M4* As seen from shaft side.Technical InformationH1P 115/130 Axial Piston Single PumpsControl Options© Danfoss | May 2018 BC00000198en-US0901 | 21