TEMA TELECOMUNICAZIONI SRL
Doorphone AA-514
MAS-AA514-REV03EN
Page 29 of 56
8.4.
Description of the terminal blocks of relays
The circuits related to the relay 1 and relay 2 are equivalent but electrically separate and distinct. The blocks of
their terminal connections in the system AA-54 are arranged in the same way. As described for the terminal block
called TB1 (terminal block of relay 1) therefore applies also to the block called TB3 (terminal block of the relay 2).
Below is drawn the existing electrical connection on the AA-514 system board for each block.
Each relay provides one normally open contact "NO" that can be activated in closing. It is also possible to operate
the contact in negative logic as if it were a normally closed "NC" contact (see the parameter 147 for this feature for
relay 1 and the parameter 148 for relay 2). For the versions of AA-514 equipped with solid-state relays this function
is not available.
The terminals are removable for convenience and ease of wiring. The two relays are both programmable and
usable to perform the opening of two different gates, while their additional functions in addition to the door opening
function, are different. The load characteristics of the contact are also described in section 4.
The mode of operation of the two relays is set using certain system parameters, and is explained in the list of
parameters respectively to the parameter 138 for the relay 1 and the parameter 144 for the relay 2, in the column
"description".
8.4.1. Solid State relays and Electromechanical relays
AA-514 systems can be, depending on the model, equipped with electromechanical relays or solid-state relays.
While the electromechanical relay uses moving mechanical parts each time it is turned on and off, the characteristic
of the solid state relay is not to have mechanical components, therefore has no wear and an almost unlimited
lifetime or certainly independent of the number of drives compared to electromechanical component. The two types
of relays, when used in the circuits of AA-514, allow to get the use of the system in different conditions, as
described below.
The systems equipped with electromechanical relays have the following characteristics:
•
to operate the relays is necessary that the system is powered with external power adapter (AA-39AL)
•
the possibility to keep each relay activated for long periods of time, see the parameters 137 and 142
•
the possibility to set the use of contact "NO" (normally open) of one of the 2 relays or even both in negative
logic so that it behaves like a contact "NC" (normally closed ), which opens itself during its activation, see
the parameters 147 and 148
The systems equipped with solid-state relays have the following characteristics:
•
to operate the relays is not necessary that the system is powered with external power adapter (AA-39AL)
•
door opening operation is obtainable with the only power from the telephone line
•
the relay activation is limited to short periods of time (see the parameters 137 and 142 )
•
it is not possible to use the “NO” contact as a “NC” contact, the parameters 147 and 148 have no effect
•
the working voltage of the electric lock (the load of the relay) must be between minimum 12V and
maximum 30Vac, voltages lower than the minimum do not allow the use of this type of relay
The first pair of terminals is the output to redistribute the power source to other parts of
the system without having to connect two wires in the same terminal.
Terminals of the points TB1.1 and TB1.2 for relay1 / TB3.1 and TB3.2 for relay2.
The second pair of terminals is the input to connect the power source for the load to
activate with the internal system relay.
Terminals of the points TB1.3 and TB1.4 for relay1 / TB3.3 and TB3.4 for relay2.
The third pair of terminals is the one where is connected the load driven by the
internal relay of the AA-514 system.
Terminals of the points TB1.5 and TB1.6 for relay1 / TB3.5 and TB3.6 for relay2.
The maximum load capacity of the relay contact is 30V 2A.
