MA-001 – TRANSFIX-family Installation Manual – Rev 3.0 18-Jan-16 Page 30 of 55
10 ELECTRONICS
10.1 System Board
The product provides connections for the alarms, PSTN, serial communications and
transformer load sensor. These screw terminal connections are located on the System
board at the back of the front panel (see Appendix I). Communications modules and
optional analogue inputs are also located here. All cabling, communications and sensor
wiring that lead into or out of the product are made through the two left-hand-side 20
mm cable glands on the bottom. There are also cable tie bases on the inner side of the
front panel for securing the cables.
Note: After the product has been in operation, components may get hot within the inner
compartments and inside the front panel. Care should be taken that all items have cooled
sufficiently before carrying out any work.
10.2 Alarm Connections
The product has eight relays — a service relay, a watchdog relay and six user-
configurable caution and alarm relays, and four front-panel LEDs. Relay outputs are
located along the terminal strip on the System board (see Appendix I). Three connections
are provided to each relay: NO (Normally Open), NC (Normally Closed), and COM
(Common). Each alarm relay can handle a maximum of 3 A at 250 V AC, 150 mA at
300 V DC, 200 mA at 125 V DC or 3 A at 30 V DC (see Appendix I).
Service relay — notifies the user of an error condition.
The blue LED illuminates if internal error checking detects an error condition. If
after the next measurement run, there are no error conditions present, the blue
LED switches off.
Watchdog relay — notifies the user of power to the product.
The green LED illuminates when the product is connected to the mains power and
is powered on.
Relays 2-7 — notify the user when a user-configurable caution and/or alarm
threshold is reached.
The yellow (caution) or red (alarm) LED illuminates when a caution or alarm state
arises respectively. If after the next measurement run, no caution or alarm states
exist, the respective LED(s) switch off. Use the TransConnect software to set alarm
and caution limits for many different combinations of results. (See the
TransConnect User Guide for more information).
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