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Theory of Operation
Chapter 3: Theory of Operation
Page 3 - 6
RESIDENT® Low Bed Service Manual (man259)
Figure 3-3. Electrical Control Box Connections
The input power is split within the electrical control/lockout box (B). One
branch of the AC power is routed through a series of relays to control the knee
actuator (C), head actuator (D), and hilow actuator (E). A second branch is
converted to 24V AC, then rectified to 24V DC, and output to the lockout
controls and junction box (F).
All components are plug-connected to the electrical control/lockout box (B).
Connector plugs for the actuator motors are interchangeable, but the power
cord (A), junction box (F), and actuator plugs cannot be connected to one
another’s terminals.
Lockout Functions
The lockout controls are toggle switches that push in and out. The function is
locked (will not operate) when the button is in. Three lockout controls are
available: hilow (G), head (H), and knee (I) (see figure 3-4 on page 3-7). If the
optional battery backup function is used, the battery connects to the system
through the plug-protected port (J) next to the lockout controls.
m259_020
Summary of Contents for RESIDENT P872
Page 2: ......
Page 6: ...Revisions Page iv RESIDENT Low Bed Service Manual man259 NOTES...
Page 12: ...Table of Contents Page x RESIDENT Low Bed Service Manual man259 NOTES...
Page 32: ...Chapter 2 Troubleshooting Procedures Page 2 2 RESIDENT Low Bed Service Manual man259 NOTES...
Page 78: ...Chapter 3 Theory of Operation Page 3 2 RESIDENT Low Bed Service Manual man259 NOTES...
Page 136: ...Chapter 5 Parts List Page 5 2 RESIDENT Low Bed Service Manual man259 NOTES...
Page 138: ...Warranty Chapter 5 Parts List Page 5 4 RESIDENT Low Bed Service Manual man259 NOTES...
Page 149: ...Main Frame Chapter 5 Parts List RESIDENT Low Bed Service Manual man259 Page 5 15 5 NOTES...
Page 158: ...Labels Chapter 5 Parts List Page 5 24 RESIDENT Low Bed Service Manual man259 NOTES...
Page 160: ...Chapter 6 General Procedures Page 6 2 RESIDENT Low Bed Service Manual man259 NOTES...
Page 170: ...Chapter 7 Accessories Page 7 2 RESIDENT Low Bed Service Manual man259 NOTES...