Hill-Rom P870, Manual

Page: 105 / 231

Electrical Theory of Operation
Chapter 3: Theory of Operation
Page 3 - 8 Resident
TM
LTC Bed Service Manual (man136rc)
3
Motor Actuators
The three motor actuators are built to withstand the common hazards of spills
and cleaning liquids under normal conditions. These motor actuators are a
plug-in design for easy removal in the event of problems. Each is especially
designed for the individual function it is to perform and has the following
characteristics:
• 24 volt, DC motor
• Electronic overload protection, microswitch motor cutoff
• Totally enclosed, impact resistant, motor housing
• Permanently lubricated
• Precision-rolled acme spindle for linear actuation of stainless steel piston
• Heavy-duty ball bearing spindle mount
The battery pack accessory can provide emergency operation of the actuators
to position the bed in event of a power failure.
NOTE:
The duty cycle (continuous operation) of any actuator should not be more than
10%.
Hilow
• 12.60" (32.0 cm) actuator stroke
• 20.25" (51.4 cm) retracted length
Head
• 7.25" (18.4 cm) actuator stroke
• 46.38" (117.8 cm) retracted length
Knee
• 2.88" (7.3 cm) actuator stroke
• 39.25" (99.7 cm) retracted length
Handset Control
The handset control provides electrical control of head, knee, and hilow
elevation. The buttons on the handset are pictorially labeled to indicate their
function.