LINET Wissner-Bosserhoff ELEGANZA 4, Service Manual, Page: 8 / 57

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3.1.2 Technical parameters
3.1.3 Control unit
The PB43 red unit is used for controlling 4 linear units, with outputs for controllers and a backup rechargeable battery
power source. It is controlled via low-voltage switches and allows the use of membrane keypads. The control unit has
4 outputs for the linear units, an input for connecting a rechargeable battery, and an input for control panels with safety
functions (ACP). The PB43 red unit also contains inputs for weight transducers, an undercarriage module, limit
switches, and an add-on matrix controller. The PB43 red unit is built into the instrument case and is equipped for dual
power from the mains and from batteries . During mains operation, the rechargeable battery is continuously powered
and charged, and while the rechargeable battery is in operation, the electronics are disconnected after approximately
3 minutes without command. The control unit has a function to synchronise speed of the lift units (see
Synchronisation (calibration) of speed of lift units) of the mattress platform, and to lock the units (See If resistance is
detected in any of the controllers, it is signalled by all the lock LEDs flashing, the control unit always permitting one
movement of the bed after the STOP button is pressed. Information about the leak is recorded simultaneously in the
permanent memory of the control unit.
Positioning function locks and safety circuit to detect overload (See Detecting overload).
3.1.4 Technical parameters
Parameters Values
Dimensions: 310 x 125 x 90
Cover: IP54
Number of outputs for motor units: 4
Output current for motors: 5 A
Current load of any motor output during positioning: less than or equal to 5 A
Maximum voltage at outputs for motors idling: 42 V DC
Maximum performance: internally limited
Maximum tolerance of configuration
of current limitation:
±20%
Number of control buttons (functional inputs) 30 - basic matrix 6 x 5
3.1.5 Control unit modes and safety functions
The architecture of the control unit is designed to exclude or significantly limit the risks arising from using a
programmable electronic system.
The default general requirement is the safety of the system when there is one fault. The basic safety features are:
3.1.5.1 Synchronisation (calibration) of speed of lift units
The function to stabilise speed of lift units allows the speed of lift of all columns to be synchronized. This makes it
possible to maintain the bed in a horizontal position. Synchronisation must be performed after each change of
column, control unit, and accelerometer .
Parameters
Values
Nominal supply voltage: AC 230, 100, 110, 127V
(±10%) / 50-60 Hz
Fuse protection:
2 x tube fuse 5 x 20mm
T1,6A for 230V; T3,15A for 100-127V
Maximum performance: internally limited
Maximum tolerance of configuration
of current limitation:
±20%