Voltage On The Device Housing / Electric Shock - h/p/cosmos 150/50 mercury Operating And Service Manual

9.6

Voltage on the device housing / electric shock

Open (interrupted) earth wire / ground
If the earth wire (ground) is not connected (for example due to defect in the building installation), a voltage will be on the
metal frame via the „Y-anti-interference capacitor". This is very common with almost all electrical equipment with metal
housing and EMC-fault clearance filters if 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 V runs via the capacitor
of the EMC-fault clearance filter (to be found in the device) between housing and earth. There is a voltage [5] of approx
110 V AC between frame [3] and grounding [4 via the capacitors of the incorporated EMC filters, e.g. via the floor or
heating radiator system or other grounded parts or machines.
a) If a sports device (without potential isolation transformer) is flawless, the current flow will be significantly noticeable
when bare metal parts (for example screws) are touched.
b) If a medical device (with potential isolation transformer) is flawless the current flow will remain nearly unnoticed
when bare metal parts (for example screws) are touched.
c) If either sports or medical devices are defective, e.g. because of a defective isolation inside the device, the current
flow may be fatal if bare metal parts (for example screws) are touched.
Disengage the device immediately, unplug it and secure it against new start-up.
Order an authorised electrician to repair the contactor circuit in the building or/and on the
device.
Read and follow the directives and information concerning the check of ground-wire terminals and functions in the
chapters on installation, maintenance and safety checks of this operating and service manual.
Always connect potential equalization cables as described in chapter 7.4.6.2 entitled "Potential equalization (only
for medical treadmills)".
9.7 POLAR heart rate measurement system
WARNING: Heart rate monitoring systems can be inaccurate.
Possible sources of interference:
Screens, computers, printers, mobile phones and any radio engineering systems
N
Electric devices, electric motors, transformers
N
High-voltage transmission lines, also from trains
N
Strong fluorescent tubes nearby
N
Central heating radiators
N
Other electric devices
N
In order to prevent interferences of the running machine, place the device at some distance away from such sources of
interference. Do not rely on the indicated values if you suspect interference.
Please consult the instructions provided by the manufacturer POLAR concerning interference at
http://www.polarservicecenter.com/Frame-Troubleshooting.htm
© 2012 h/p/cosmos sports & medical gmbh
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email@h-p-cosmos.com created 04.05.2012 printed 04.05.2012
trouble shooting
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