MultiSmart Installation & Operation Manual
The following parameters can be set from the IRT Configuration screen:
Name Description Default
Test Voltage The insulation tester can operate at 250V, 500V or 1000V. 1000VDC
Test Duration
Sets how many seconds the insulation test will last. The recommended time
is 60 seconds.
60s
Test Interval
Time interval between tests in hours. Tests are only conducted when the
pump is stopped and the Cool Down Period has expired.
4h
The Cool Down Period gives the pump a set amount of time to cool down
before the insulation resistance test is run.
10s
Max Resistance Maximum resistance displayed by the test
999.99 MΩ
Table 26 – Basic IRT Parameters
17.2.2 Soft Starter and Pump Isolation for IRT
When a Soft Starter (or VFD) is used, it is essential (in most cases) to isolate it from the Insulation
Resistance Test voltage (1000V DC). This can be accomplished using isolation contactors positioned after
the Soft Starter. A digital output (one for each pump) is assigned to a pump isolation tag which becomes
active whenever the Insulation Resistance Test is in progress.
17.2.2.1 Assigning the Pump Isolation Tag to a Digital Output
To isolate the IRT voltage from a Soft Starter, a digital output is used to activate the Isolation contactor.
The procedure to configure a digital output for this purpose follows.
• Firstly identify a free digital output for each pump
• Navigate to:
• Highlight the selected Dout
• Press Config and then press the Advanced button
• Now find the source (pump isolation tag)
Navigate to:
• Once PumpIsolation is highlighted, press Ok
• Press Ok, Back, Save and Restart Later
• Repeat this procedure for each pump – allocating the selected Dout to the appropriate pump isolation
tag.
• When the last tag is assigned restart the unit.
Page 156 of 260 MultiSmart_IO_Manual_R20
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