Electrical System
Chapter 3: Theory of Operation
3 - 2 Affinity® Four Birthing Bed Service Manual (195826 REV 2)
CASTERS
The bed has four casters: three brake and one brake/steer. Each caster has a 30° inclination activation
mechanism and three positions:
• Brake caster—Brake/Neutral/Neutral
• Steer caster—Brake/Neutral/Steer
The brake/steer caster is on the left side, at the foot end.
CENTRAL BRAKING SYSTEM
The braking system has thee brake casters and one brake/steer caster. The casters are controlled by the
brake/steer pedals connected by a hexagonal bar at the center of the bed, and connecting rods that go
to the casters.
STEERING
The left foot-end caster is the brake/steer caster. It is controlled by the brake/steer pedal. When the
brake/steer pedal is put in the steer position, the brake/steer caster locks parallel with the frame of the
bed.
TRENDELENBURG-LIKE POSITION
The Trendelenburg-Like Position control is a fully mechanical function accessed by the caregiver.
Trend-Like Position handles on each side of the head section will release the Trend-Like Position gas
piston to allow for up to 8° of Trendelenburg-Like positioning.
HEADBOARDS
The headboard is a blow-moulded plastic structure with built-in push handles. Optional wood
headboards are available. Push handles can be installed with the wood headboards.
ELECTRICAL SYSTEM
POWER MODULE
The Power entry module is a dual fuse holder and line filter combined. One fuse in the Line and one fuse
in the Neutral. To make sure that you have the current part numbers, go to “Electronics Module (Sheet 1
of 2)” on page 5-44.
For 100 V, 50/60 Hz power, use Hill-Rom® part number 7061001, fuse, 5.0 A.
For 120 V, 50/60 Hz power, use Hill-Rom® part number 4314317, fuse, 4.0 A.
For 230 V, 50/60 Hz power, use Hill-Rom® part number 182100, fuse, 2.0 A.
The main transformer has 3 input primary taps: gray is 100 V, black is 120 V, orange is 230 V. The
secondary is 24 V AC. The main transformer provides low voltage AC power to the control board.
Two 12 V DC, 7.2 Ah batteries connected in series with a 10 A automotive style fuse provides 24 V DC
battery power to the control board.
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