Document No: LT0255
F3200/NDU AS4428.1 Installation Manual
Installation & Wiring
Issue 1.22
5 July 2016
Page 5-21
5.6
MODULE RELAY WIRING
The 8 Relay Module relays each have one set of voltage free change-over contacts (i.e. one
pole) accessible via screw terminals, to switch plant equipment. The second pole of each
relay can be accessed by fitting a 3-way de-mountable connector block pair CN0488 and
CN0260.
There are two sets of four inter-connected, voltage free, looping terminals per module that
can be used for looping supplies onto relays or loads.
If the load switched is inductive e.g. a solenoid coil, a suppression diode must be fitted as
shown in Fig 5.6.1.
Supervision
Supervision of the field wiring from the FIP to the load is shown in Fig 5.6.1. This only works
for a single load, or multiple co-located loads wired in parallel (though for multiple co-located
loads, the supervision will not detect a fault if one load becomes disconnected). It requires
the load or an EOLR to be connected between the relay COM terminal and the FIP 0V, and
the supervision link on the module to be fitted in the "S" position. If the COM output does not
‘see’ a supply voltage or open circuit when the relay is activated (requires V2.09 or greater
software, then the relay must be programmed to not supervise the load when activated.
An example of supervising a circuit of multiple, separately located loads using 2 poles of one
relay is shown in Fig 5.5.3.
+VBF o─────┐
│
│
┌─ │
| NO o─────┘
|
RLn | NC o INDUCTIVE LOAD
| (SEE NOTE)
| COM o──────────────────────────────────────────────┬───────────┐
└─ ┌─┴─┐ ╒╧╕
S │ │ │ │
───o o └─┬─┘ └┬┘
0V o───────────────────────────────────────────┴───────────┘
SUPPRESSION
a
.
DIODE
Note: For a load of less than 400 Ohms a diode of suitable current rating must be wired in
series with the load at the load as shown in b. below.
──────┬───┐ ──────┐
INDUCTIVE┌─┴─┐╒╧╕ ┌┴┐
LOAD│ ││ │DIODE │ │DIODE
└─┬─┘└┬┘ ╘╤╛
├───┘ OR ├───┐
┌┴┐ INDUCTIVE┌─┴─┐╒╧╕
│ │DIODE LOAD│ ││ │DIODE
╘╤╛ └─┬─┘└┬┘
0V ──────┘ 0V ─────┴───┘
b.
FIG 5.6.1
EXAMPLES OF MODULE RELAY WIRING WITH SUPERVISION
