Neutral Start Switch data
Max. continuous current with switching
8.4 A
Max. continuous current without switching
20 A
Max. voltage
36 V
DC
Electrical protection class
IP67 / IP69K with mating connector
Case Gauge Port M14
The drain port should be used when the control is mounted on the unit’s bottom side to flush residual
contamination out of the control.
MDC schematic diagram
Control-Cut-Off (CCO) valve and brake valve
The H1 tandem pumps offer an optional control cutoff valve integrated into the pump center section.
This valve shunts charge pressure from the pump controls allowing the servo springs to de-stroke both
pumps. The valve is normally open for fail-safe operation. The solenoid must be energized for the pump
to operate. When the machine control circuits energize the CCO solenoid, it connects charge supply from
the charge gallery to the pump controls.
The 45/53cc tandem also supplies charge pressure to the port X7 for auxiliary operation of devices such
as spring applied/pressure released brakes. The control cutoff valve also shunts pressure away from port
X7.
The 60/68 tandem offers a separate brake release valve that operates independent of the CCO valve
allowing the controls to be activated before activating any auxiliary functions. When the 60/68 brake
valve is deactivated the X7 port shunts to case."
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
Operation
©
Danfoss | June 2018 520L0928 | AX00000103en-US0303 | 17
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