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MR810 Technical Manual Revision C REF 185042601
31
7
7 ELECTRICAL SAFETY TESTS
After the MR810 has been serviced, perform the following electrical safety tests as listed below or in
accordance with relevant country regulations.
7.1 PROTECTIVE EARTH RESISTANCE
Use an ohmmeter and measure the resistance from the earth pin on the mains plug to the heater plate. To
ensure good contact with the anodised heater plate an alligator clip is recommended. Connect at the front of
the heater plate where the anodising has been removed (see Figure 7.1). The resistance should be ≤ 0.2 Ω.
7.2 EARTH LEAKAGE CURRENT
Measure earth leakage with the earth probe of the tester on the heater plate (see Figure 7.1). Eart h leaka g e
current is measured at normal mains operating voltage and frequency; it should not exceed 0.5mA
maximum.
7.3 INSULATION RESISTANCE
Use a 500 VDC insulation resistance tester to measure the resistance from the phase pin on the mains plug
to the heater plate (see Figure 7.1). Insulat io n resi st ance sh ould be ≥ 10 MΩ.
Figure 7.1: Location of test point on heater plate