4 test procedures, Insulation resistance, Protective grounding – Yokogawa Button Operated MV2000 User Manual
Page 19: 4 test procedures -4, Insulation resistance -4 protective grounding -4
3-4
SM MV1000-01E
3.4 Test Procedures
Insulation Resistance
● Test Procedures
Perform a measurement with an insulation resistance meter and check whether the
results satisfy the reference values. Perform the measurement with the power switch
turned ON.
Reference Value
Terminals Measured
Reference Value
Condition
Between the power and protective ground
terminal
100 MΩ or more
Short the L (+) and N (–)
terminals.
Between the input and protective ground
terminal
100 MΩ or more
Short all input terminals.
Between the Ethernet and protective
ground terminal
100 MΩ or more
Short all pins of the Ethernet
terminal.
Between RS-422-A/485 SG and
RS-422-A/485 FG terminals
100 MΩ or more
With the /C3 option.
Protective Grounding
● Test Procedures
Perform a resistance measurement with a DMM (digital multimeter), and check
whether the results satisfy the reference values.
Reference Value
Measured Location
Reference Value
Between the protective ground terminal
and functional ground terminal
0.2 Ω or less
MV1000
Functional ground
terminal
Power inlet
Protective ground
terminal
Power supply
screw terminals