trouble shooting
file: n:\article\cos14310m5-v1_06hpc-en\20120215_cos14310m5-v1.06hpc-en_manual_h-p-cosmos_running_machine.doc
© 2012 h/p/cosmos sports & medical gmbh [email protected] created 15.02.2012 printed 15.02.2012 page: 145 of 213
[10.E]
Voltage at the device housing / electric shock
[10.E1]
Open (interrupted) earth wire / ground
In case the earth wire (ground) is not connected (for example due to defect in the building installation), on the
metal frame of the device a voltage will be life via the „Y-noise-suppression-capacity“. This characteristic is very
common with almost all electrical equipment with metal housing and EMC-fault clearance filters. The earth wire
and/or contactor at the wall socket [1] in the building or at any other part of the AC-power line/feeder is open [2]. In
this case a voltage of approximately 110 volt runs via the capacitor, of the EMC-fault clearance filter (to be found in
the device) between housing and earth. Via the capacitors of the incorporated EMC-filters a voltage [5] of approx.
110 volts AC is live between frame [3] and grounding [4], e.g. via the floor or heating radiator system or other
grounded parts or machines.
a)
If the device is flawless (at device category sports = without Potential-Isolation-Transformer) the current flow
is significant noticeable in case of touching any bare metal parts (for example screws).
b)
If the device is flawless (at device category medical = with Potential-Isolation-Transformer) the current flow is
almost not noticeable in case of touching any bare metal parts (for example screws).
c)
If the device is defective (at device category sports and also medical), e.g. because of a defective isolation
inside the device, the current flow may be life-threatening high in case of touching any bare metal parts (for
example screws).
Take the device out of operation immediately, unplug it and secure it against new start-up.
Order an authorised electrician to repair the contactor circuit in the building or/and at the
device.
Read and follow the directives and information concerning check of ground-wire terminals and functions in the
chapters installation, maintenance and safety checks of this operation and service manual.
[10.F]
Malfunctions of the heart rate measurement system POLAR
Possible sources of interference:
N
Screens, computer, printer, mobile phones and any radio engineering system
N
Electric devices, electric motors, transformer
N
High-voltage transmission lines, also from trains
N
Strong fluorescent tubes near by
N
Central heating radiators
N
Other electric devices
