RUNRACE : Service & Maintenance Manual - rev. 2.0
Page 11.13
11.10. LEAKAGE CURRENT PROBLEMS WITH HITACHI E5
INVERTER
The introduction of Hitachi inverter version E5 on the machine has given rise to problems with
increased earth leakage currents, which result in non-conformance to the relevant regulations for
electromedical equipment.
In fact, in order to keep the emissions within the limits set down by the regulations for light
industry, this inverter version has a capacitive filter to ground on the supply conductors, which
increases the current in the earth conductor up to 1200 µA.
The leakage currents for the individual machine components are detailed in the table below:
COMPONENT Model
I
leakage
Inverter Hitachi J100 E5
1200 µA
Power supply Lambda ZT30-522
300 µA
Schaffner FN350-20-29
4900 µA
Filter
Schaffner FS5458-20-29
350 µA
Transformer - -
with FN350 filter
5400 µ
µµ
µA
TOTAL FOR MACHINE
with FS5458 filter
1850µ
µµ
µA
To ensure conformance to the values prescribed by the regulations in force, pending further
instructions proceed as follows:
• On the Lambda ZT30-522 power supply, eliminate the two capacitors C3 and C4 (2200 pF).
This reduces the leakage of the power supply to approximately 0 µA.
• On the Hitachi E5 inverter, eliminate the two capacitors CNX and CPX (10 nF). This reduces
the leakage of the power supply to approximately 0 µA.
• In place of the Schaffner 350/20/29 filter, use the Schaffner FS5458-20-29 filter specially
manufactured for Technogym, which has order code 0WB018. This filter is installed as standard
on machines with SN 6000120008, or raise the filter off the ground.
• Suspend the Schaffner 350-20-29 filter using insulating spacers and plastic screws. This reduces
the leakage of the filter to approximately 0 µA.
• Replace the Schaffner 660-3/06 filter with the Schaffner 610B-3/06 filter with order code
0WB016.
• Replace the Schaffner 660-10/06 filter with the Schaffner 610B-10/06 filter with order code
0WB015.
Always obtain authorization from the Technogym Service Center before carrying out
this operation.
With these modifications, the machine leakage current is reduced to approximately 400 µA,
bringing it within the 500 µA limit prescribed by the regulations.
