Watson Marlow Pumps 501 Trio Manual page 3

500 and 600 series close coupled pumps
Details on the use, operation, maintenance and spare parts for the 500 and 600 series close coupled pumps can be found in the
accompanying manual PB 0279.
Trio cose coupled pump operating instructions
Trio close coupled pumps combine a pumphead, motor/ gearbox and integral inverter into a robust IP55 pump.
This equipment contains hazardous voltages (at mains potential) inside the pump. If access is required, turn
the power off and wait one minute so that the dc-link capacitors can discharge. Some parameter settings
can start the motor automatically after a mains failure. The Trio inverter is not to be used as an emergency
stop mechanism, a circuit breaker must be used.
Wiring connection details
Remove the four M4 cross head screws on the Trio's cover to access the electrical terminals (see Fig. 2).
Note: A 'drip loop' is recommended when connecting the mains and control cables (see Fig. 1).
Fig. 1 Connecting mains cables and control cable with a drip loop.
The printed circuit board is particularly sensitive to static electricity. For this reason, avoid touching the
boards or components with your hands or metal objects.
500 and 600 series Trio close coupled pumps
3