Instruction Manual for Libra Care Bed
Page 93
II. Electrical Measurement (use only measuring instruments according to DIN EN 62353 (VDE 0751-1))
Note: To minimise measuring errors, route the test leads as far away as possible from and not parallel to the
power cables and handset cables of the bed. Also observe the operating instructions for the measuring
instruments used
Insulation resistance (to be carried out only if there are doubts about the electrical insulation, such as:
If the customer’s RCD (residual current circuit breaker) has tripped several times
If defective electrical housings are found and at the same time there are signs of spilled liquids/contamination
there that could affect the insulation
1. Plug the mains cable/switch mode power supply into the test socket of the measuring instrument.
2. Connect the probe at the common measuring point of all applied parts: = bare screw of the backrest swivel
joint underneath the backrest on the mattress base frame
3. Start the measuring procedure on the measuring instrument; measuring voltage = 500 V DC
Result: Bed prot. class II (type B)
Leakage current (direct or differential current measurement) (type BF)
Proceed as follows:
1. Plug the mains cable/switch mode power supply into the test socket of
the measuring instrument.
2. Connect the probe of the measuring instrument to the bed; measuring
point: Bare metal screw under backrest in frame of mattress base
3. Operate the motors using the handset for the duration of the
measurement
4. Start the measurement procedure on the measuring instrument
Current value
mA (normalised to rated
value of mains voltage)
Result: Bed prot. class II (type B)
- In case of measured voltage external conductor
- earth
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