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MA-005 - MINITRANS Installation Manual - Rev 3.1
29-Sep-15
Page 32 of 85
10
ELECTRONICS
10.1
Input Board
The product has an input board and a marshalling board for connections. The input
board is located on the internal bottom tier of the product and has screw terminals to
provide connections to the alarms, PSTN, serial communications and transformer load
sensor (see Appendix I).
Communications modules are found on the marshalling board located on the second tier
of the product (behind the plastic cover). All cabling, communications and sensor wiring
that lead into or out of the product are made through the two 16 mm cable glands on the
bottom of the product. 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 two relays — a service relay and a caution and alarm relay — and two
corresponding external sunlight-visible red and green LEDs on the front door. When the
product is connected to the mains power and is powered on, the green LED illuminates
continuously. Relay outputs are located along the terminal strip on the Input board (see
Appendix I). Three connections are provided for each relay: NO (Normally Open), NC
(Normally Closed), and COM (Common). The relays can handle a maximum of 1 A 250 V
AC, 300 mA 110 V DC or 1 A 30 V DC (see Appendix I).
Relay 1 is the service relay.
The green LED flashes if internal error checking detects an error condition. If after
the next measurement run, there are no error conditions present, the green LED
resumes continuous illumination.
Relay 2 is the caution and alarm relay.
The red LED indicates when a user-configurable caution and/or alarm threshold is
reached. Flashing denotes a caution state whereas continuous illumination
denotes an alarm state. If after the next measurement run, no caution or alarm
states exist, the red LED switches 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).