Output speed
Start and low speed stability. The motor produces maximum starting torque at maximum
displacement. Stable operation can be achieved at 15–34 rpm, ± 5 %, depending on system pressure, in
applications that require low speed stability. Motor output speed becomes more stable as speed
increases.
Rated speed is the highest output speed recommended at full power condition. Operating at, or below
this speed will yield satisfactory product life.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces the
product life and can cause loss of hydrostatic power and dynamic braking capacity. Never exceed the
maximum speed limit under any operating conditions.
Operation between rated and maximum speed is reserved for intermittent operation (see
range diagrams for open and closed circuit
on page 13) not to exceed 10 minutes durations, 2% of duty
cycle based load-life, and 310 bar system delta pressure. Speed above rated are anticipated to occur
during downhill braking (negative power). Contact factory for any operation above Rated speed when
negative power is not involved.
During hydraulic braking and downhill conditions, the prime mover must be capable of providing
sufficient braking torque in order to avoid pump over speed. This is especially important to consider for
turbocharged and Tier 4 engines.
W
Warning
Unintended vehicle or machine movement hazard.
Exceeding maximum speed may cause a loss of hydrostatic drive line power and braking capacity. You
must provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold the
vehicle or machine in the event of hydrostatic drive power loss. The braking system must also be
sufficient to hold the machine in place when full power is applied.
Technical Information
H1 Bent Axis Variable Displacement Motors, Size 060/080/110/160/210/250
Operating parameters
©
Danfoss | December 2016
11037153 | BC00000043en-US1103 | 25
