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6.3 INSTALLATION INSTRUCTION OF THE PEM4 + SPU3 SYSTEM
The propulsion efficiency monitoring system consists of a SPU3 and a PEM4 touch screen, T-Sense
®
or TT-Sense
®
sensors, flowmeters, speed log/GPS/NMEA input and draft/inclino meters will be
connected to the SPU3. The SPU3 will perform all calculations and data processing to the PEM4
touch screen.
1. Always install the SPU3 with cable glands facing downwards. Do not take electronics out of the
cabinet.
Figure 5 – SPU3 positioning
2. Install the SPU3 in the engine room (ER), engine control room (ECR) or near to the HFO booster
units, but as much as possible free from moisture, free from large fluctuations of temperature and
particularly free from vibration and shock. Also influences such as large magnetic fields must be
avoided. Ambient temperature should under all circumstances be lower than 55°C. External
dimensions drawings of the SPU3 can be found in section 17.
3. Connect the RS485 Modbus output from the stator control box of one T-/TT-Sense
®
sensor to the
SPU3 in accordance with drawing 0815-2019 in section 17.
When available, the second T-/TT-Sense
®
sensor cable needs to be connected as well.
4. Connect the signal outputs of the flow meters, speed log and/or shaft generator to the SPU3 in
accordance with drawing 0815-2019 in section 17.
Cable shields of the flowmeter cables should always be connected to the SPU3 side only.
5. Connect the RJ45 Ethernet output from the SPU3 to the PEM4 touch screen in accordance with
drawing 0815-2019 in section 17.
6. Ensure that all relevant signal cables are properly connected and grounded.
7. Connect the power supply to the SPU3 and PEM4 touch screen(s) in accordance with drawing 0815-
2019 in section 17.
8. Check if the output data is available on the touch screen(s) through menu <ALARMS> <Signals(raw)>.
If any applicable output data is not available on the touch screen a pop-up alarm screen describing
the failure(s) will show up.
Important notes
• Never connect cable shields at both ends to ground, but at one end only, to avoid
earth loops.
• Avoid interference on the signal cables by installing them as far as possible away
from electric power cables.
• Ensure that the ambient temperature at the SPU3 never exceeds 55⁰C.
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