Edwards nEXT 55, Instruction Manual

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stop command has been received by the pump can any commands sent through the
parallel interface be acted on.
If you use the start switch on the parallel interface to start the pump, you cannot stop
the pump by sending a stop command over the serial interface. To stop the pump, use
the parallel stop switch. The serial interface accepts the start or stop commands only
when you use the parallel interface switch to stop the pump.
Figure 26 Logic interface connection - mixed parallel and serial operation
1. RS232 interface on control equipment 2. 24 V d.c. electrical supply
3. Fuse 4. Optional LED indicator - system OK
5. Optional LED indicator - normal speed 6. Current limit resistor for LED
7. Optional serial link selector 8. pump
9. Optional voltmeter 10. Optional serial enable switch
11. Optional standby switch 12. Start switch
1. RS232 interface on control equipment 2. 24 V d.c. electrical supply
3. Fuse 4. Optional LED indicator - system OK
5. Optional LED indicator - normal speed 6. Current limit resistor for LED
7. Optional serial link selector 8. pump
9. Optional voltmeter 10. Optional serial enable switch
11. Optional standby switch 12. Start switch
4.8 Cooling
4.8.1 Cooling requirements
CAUTION: PUMP COOLING
Risk of damage to equipment. Make sure that the pump is sufficiently cooled to
prevent damage to the rotor and bearing.
When you use an alternative configuration (other than the manufacturer's standard
cooling accessories) to cool the pump, make sure that the cooling is not directed or
ducted onto the pump controller.
CAUTION: VENTILATION FOR PUMP
Risk of damage to equipment. If the pump is in an enclosure, make sure that
sufficient ventilation is available. The ambient temperature around the pump must
not be more than 40 °C.
07/2021 - ©Edwards Limited Page 59 B8G000880_E
B8G000880_E - Installation