Connection For Serial Control And Monitoring; Figure 21 Logic Interface Connections - Parallel Control; Figure 22 Simplified Logic Interface Connections - Parallel Control - Edwards nEXT730D Instruction Manual

The output can be used to control other devices in the pumping system. The
output can drive a low power relay of up to 24 V d.c. coil rating (up to 20 mA).
4. To monitor the fail status output, connect the customer control equipment to the
fail output (pin 7) and to pin 2 of the customer logic interface mating half.
The output can be used to control other devices in the pumping system. The
output can drive a low power relay of up to 24 V d.c. coil rating (up to 20 mA).
Electrical supply connection to pins 1, 6 and 11 is not required for the nEXT pump as it
has a dedicated pump power supply cable. The fuse is only required if a 48V d.c.
electrical supply is connected to the logic interface cable. Connections to the electrical
supply via pins 1, 6 and 11 is required if indicators for either the normal speed or the
system OK status are required.

Figure 21 Logic interface connections - parallel control

2
48 V d.c.
1
1. Optional 48 V d.c. electrical supply 1. Optional 48 V d.c. electrical supply
3. Optional indicator - normal speed 3. Optional indicator - normal speed
5. nEXT pump logic interface 5. nEXT pump logic interface
7. Optional standby switch 7. Optional standby switch

Figure 22 Simplified logic interface connections - parallel control

V
3
4
1. nEXT pump logic interface 1. nEXT pump logic interface
3. Optional standby switch 3. Optional standby switch

5.6 Connection for serial control and monitoring

The serial interface allows the nEXT pump to be controlled and to be interrogated as to
its operational status using a number of serial commands or the nST2 PC software. There
B8J200880_D
300812671_002_C3
B8J200880_D - Installation
V
3 7
4 6
8
1
2
3
4
5
2
6
7
8 1
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8 5
9
10
11
12
13
14
15
2. Optional fuse 2. Optional fuse
4. Optional indicator - system OK 4. Optional indicator - system OK
6. Start switch 6. Start switch
8. Optional voltmeter to monitor analogue 8. Optional voltmeter to monitor analogue
output output
2. Start switch 2. Start switch
4. Optional voltmeter to monitor analogue 4. Optional voltmeter to monitor analogue
output output
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