Pfaff EXPRESSION 2014, Service Manual, Page: 107 / 112

105
Safety test
46. Electrical safety test
According to the German law of safe machine operation of 24th June 1986, the VDE-regulations are
regarded as the official rules in electronics and are the basis for the regulations for testing electrical
safety of technical devices.
The required electrical tests are established in the regulations for repair, modification and testing of used
electrical appliances (VDE 0701 issue 10.86) par. 4.
We are obliged to perform a test in accordance with VDE 0701 on every electrical appliance after
repair.
In European foreign countries, there are similar regulations in force which are largely identical with the
requirements of the VDE 0701.
47. Electrical safety test with ABB Metrawatt M 5013
I Mains voltage test: Volt = V
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For all following tests insert plug of ABB Metrawatt M 5013 in the grounded mains socket (fig. 115).
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Set knob for measuring range at "250 V" (fig. 115). If there is mains voltage, the LCD shows the
respective value (230 V +/- 10%).
●
Touch contact field, which is located a bit to the right just below the knob for the measuring range, with
your finger, thus checking the ground lead of the mains. Signal lamp "PE" just above the contact field
will light up only in case the ground lead is out of order.
●
Insert plug of sewing machine into the mains socket of ABB Metrawatt M 5013.
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Run the machine.
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Meter reading: 230 V +/- 10%
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Measuring appliance M 5013 can only be used with mains voltages from 207 V to 253 V
(230 V +/- 10%).
II Appliance current test: Ampere = A
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Plug of sewing machine remains in mains socket.
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Set knob for the measuring range at 16 A (fig. 116).
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Run the machine.
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Meter reading: 0.5 A maximum.
III Insulation resistance: M Ohm = M
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Insert plug of sewing machine in tester socket.
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Use clamp to attach test lead of testing appliance M 5013 to presser bar.
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Set knob for measuring range at "20 M Ohm" (fig. 117).
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Meter reading: minimum 2 M Ohm
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With meter readings higher than 20 M Ohm, appliance M 5013 displays the figure 1! In these cases,
the remark "Insulation resistance higher than 20 M Ohm" must be recorded in the testing certificate.