The power cable shields are grounded (earthed) through the cable glands to the connection box
and further to the electric machine enclosure. After the cable gland assembly and power cable
installations, and any time when needed, make sure that the grounding (earthing) connections are
correct.
1. Connect one terminal of the measurement device to the cable shield of one power cable (in
the inverter end of the cable)
2. Connect the other terminal of the measurement device to the cable shield of an other power
cable. You can also use the machine enclosure grounding point for the measurement.
3. Measure the resistance between the two cable shields or between the cable shield and the
enclosure grounding point.
4. Change the measurement device terminal(s) to the shield of different power cable and repeat
the measurement until all cables have been measured.
Testing the low voltage (measurement signal) cable shield grounding (earthing)
The low voltage (measurement signal) cable shield is connected to the grounding (earthing) point.
After cable installation, and any time when needed, make sure that the grounding (earthing)
connection is valid.
1. Connect one terminal of the measurement device to the low voltage cable shield (in the non-
machine end of the cable).
2. Connect the other terminal of the measurement device to the machine enclosure grounding
point.
3. Measure the resistance between the cable shield and the enclosure grounding point.
Anti-condensation heater connections
Do not run the electric machine when the anti-condensation heater is in use.
Water condensing inside the electric machine enclosure can result in failure or corrosion of the
machine. This often happens in cooler temperatures or higher humidity areas typically in marine
environment, when the machine is not running.
The electric machine can be equipped with anti-condensation heater to avoid condensation
issues. The heater (+HEAT1) or heaters (+HEAT2) are factory assembled see Figure Heater
connector locations . The installed heater may not be used when the machine mains are switched
on, and the machine is running.
The installed anti-condensation heater must be supplied with 230 Vac power. The heater
connector used is HUMMEL Twilock connector, illustrated in Figure below.
The electric cables for the heater warming element are connected to the pins 1 and 2, see Figure
below. The heater connector ground pin (marked with the grounding symbol) is connected to the
electric machine enclosure.
After installation of the machine, and any time when needed, the resistance of the warming
element can be measured. Connect the measurement device between the heater terminals. The
resistance shall be around 1 kΩ. Measuring no value, or zero value indicates a possible failure in
the heater element.
EM-PMI375
6. Installation
50 |
©
Danfoss | Produced By: Danfoss Power Solutions | January 2019
| BC265856307805en-000105
Summary of Contents for EM-PMI375-T200
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