3.11
Relay o/p No. 1 N.C. Link 3 – A N.O. Link 3 – B
Relay o/p No. 2 N.C. Link 4 – A N.O. Link 4 – B
Relay o/p No. 3 N.C. Link 5 – A N.O. Link 5 – B
3.3 Control Connections
As standard the following connections are provided on the 2500, and these are made
to the 2500 Analyser PCB's utilising a suitable gland in an adjacent hole. Refer to
Figure 3.2 and Table 3.3.
WARNING
Setting the relays to Normally Open (N.O.) operation will mean that there is no
fail-safe action since any loss of cable continuity will prevent an alarm being
signalled.
NOTE
Regardless of N.O./ N.C. setting, the relays will always be in "alarm" state wherever
there is no power applied to the 2500, or when they are unassigned.
NOTE
All control cables must have a braided overall screen or armour. The screen must be
terminated at the point of entry to the case. This will be by using a gland, which
makes a connection between the cable screen and the case. Beware of ground/earth
loops if the screens are also connected at the user end.
Where two cables are passed through a single entry, a metal gland specifically
intended for two separate cables shall be used.
Table 3.3 – External Control Connections
PCB Function Connections
Transmitter PCB
02500904A
Range Change TB26 – 1
TB25 – 3
Transmitter PCB
02500904A
Autocalibration Initialise TB26 – 2
TB25 – 3
Transmitter PCB
02500904A
Password Keyswitch TB26 – 3
TB25 – 3
Power Control PCB
02500911A
Flow Failure TB36 – 1
TB36 – 2
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