MI 3110 EurotestIM
Measurements
– a.c. LV IT installations
32
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
key functionality.
Figure 5.15: IMD test
Test parameters for IMD test
Limit
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]
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
