Instruction manual

SM425 INSTRUCTION MANUAL 3.0 INSTALLATION
Figure 3-18 Pipe Mounting
3.7 Insulation Resistance Test
High voltage testing may cause deterioration in insulation and a possible safety hazard. Therefore,
conduct this test only when it is necessary.
The applied voltage for this test shall be 500 V DC or less. The voltage shall be applied for as short a time
as practicable to confirm the insulation resistance is 20 MΩ or more.
Remove wiring from the converter and the detector.
1. Remove the jumper plate located between terminal G and the protective grounding terminal.
2. Connect crossover wiring between L and N.
3. Connect an insulation resistance tester (with its power OFF). Connect (+) terminal to the
crossover wiring, and (-) terminal to ground.
4. Turn the insulation resistance tester ON and measure the insulation resistance.
5. After testing, remove the tester and connect a 100 kV resistance between the crossover wiring
and ground, to discharge.
6. Testing between the heater terminal and ground, contact output terminal and ground, analog
output/input terminal and ground can be conducted in the same manner.
7. Although contact input terminals are isolated, insulation resistance test cannot be conducted
because the breakdown voltage of the surge-preventing arrester between the terminal and
ground is low.
8. After conducting all the tests, replace the jumper plate as it was.
58 42500001 REV A