Testing Of Insulation Monitoring Devices (Imd) - METREL EurotestIM Instruction Manual

MI 3110 EurotestIM

5.4 Testing of insulation monitoring devices (IMD)

This function is intended for checking the alarm threshold of insulation monitor devices
(IMD) by applying a changeable resistance between L1/PE and L2/PE terminals.
See chapter 4.2 Function selection for instructions on
key functionality.
Test parameters for IMD test
Type [MANUAL R, MANUAL I, AUTO R, AUTO I]
MANUAL R: Minimum insulation resistance [OFF, 5 k ÷ 640 k]
MANUAL I: Maximum current [OFF, 0.1 mA ÷ 19.9 mA]
Limit
AUTO R: Minimum insulation resistance [OFF, 5 k ÷ 640 k], Timer
[1 s ÷ 99 s]
AUTO I: Maximum current [OFF, 0.1 mA ÷ 19.9 mA], Timer [1 s ÷ 99 s]
Test circuit for IMD test
Figure 5.16: Connection with 3-wire test lead
Measurements – a.c. LV IT installations
Figure 5.15: IMD test
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