Flowserve MX-100 Field Unit - Manual (Page 37)

37
MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
flowserve.com
Figure 3.9 – Daisy chain topology
Legend
MOV
N/C
Data terminal is positive with respect to data* terminal
Data 1
RS-485
PORT 1
Network port A
A1*
MOV-1
See Note 5
N/C
A2*
N/C
MOV-249
See Note 5
N/C
MOV-3
See Note 5
N/C
5
4
13
14
14
13 Ground 3
Data* 2
4
5
A2
A1
A1*
A2* 14
13
4
5
A2
A1
A1*
A2* 14
13
4
5
A2
A1
- Motor-operated valve
- Data A1
- Data A1*
- Data A2
- Data A2*
- Shield
- No connection
N/C
Earth ground
(See Note 4)
N/C
MOV-2
See Note 5
A1*
A2* 14
13
4
5
A2
A1
MOV-248
See Note 5
A1*
A2* 14
13
4
3
5
A2
A1
MOV-250
See Note 5
A1*
A2* 14
13
4
5
A2
A1
Host
(Network controller)
Notes:
1. Belden 3074F, 3105A, or 9841 shielded cable is recommended.
2. Correct polarity for field unit and network controller connection is
necessary for proper operation.
3. Connections shown are typical. The number of MOVs shown may not
indicate true system size.
4. Earth ground: ground rod
5. Earth ground: ground rod or lug in actuator if actuator is grounded.
Diagnostic note:
Polarity and level of the network’s data connection can be checked by
measuring voltage between data and data* terminals. This voltage should
be greater than +200 mV DC with network controller (host) network ports
disconnected. Data terminal is positive with respect to data* terminal.
Earth ground note:
If low impedance earth ground is not available at each actuator, contact
engineering for alternative earth ground surge protection strategies.
3 3 3
3 3