Edwards nEXT200200 - Connect the Parallel Control and Monitoring; Figure 10 Logic Interface Connections - Parallel Control

Figure 10 Logic interface c
onnecons - parallel control
1. 24 V d.c. electrical supply 2. Fuse
3. Oponal LED indic
ator ‑ system OK 4. Oponal LED indicator ‑ normal speed
5. Current limit resistor for LED 6. nEXT pump logic interface
7. Start switch 8. Oponal standby switch
9. Oponal voltmeter to monitor analogue
output
1. 24 V d.c. electrical supply 2. Fuse
3. Oponal LED indicator ‑ system OK 4. Oponal LED indicator ‑ normal speed
5. Current limit resistor for LED 6. nEXT pump logic interface
7. Start switch 8. Oponal standby switch
9. Oponal voltmeter to monitor analogue
output
Note:
The v
oltage supply to the pump controller can be more than 24 V. But the circuits
connected to the normal and fail line must have maximum external pull ‑ up voltage
rang as given in Table: Logic interface technical data on page 27.
4.6 Connect the parallel control and monitoring
To make the connecons for the parallel control and monitoring, use an applicable
mang half (not supplied).
CAUTION: BACK EMF SUPPRESSION DIODE
Risk of damag
e to equipment. If the normal and fail lines are used to drive the coils of
the d.c. relays, install a back EMF suppression diode in parallel with each relay coil to
protect the pump.
Connect the customer control equipment to the control input pins of the customer logic
interface mang half. Refer to Table: Logic interface connector pins on page 28 to
idenfy the connector pins of the logic interface.
The control inputs are:
▪ Start
▪ Standby speed
T
o acvate one of the control inputs, connect the control input pin to the 0 V control
reference. To start the pump, connect the pin 3 (Start / Stop) to the pin 2 (0 V reference).
To stop the pump, remove the connecon between the pin 3 and pin 2. To put the pump
in standby, connect the pin 4 (Standby) and pin 3 (Start / Stop) to pin 2 (0 V reference).
Page 40
B85200880_D - Ins
tallaon