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PRESYS
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Instruments
DCY - 2057 Pressure Controller
• Low currents circulating through the relay contacts (less than 20mA). The relays
could not function properly when the jumpers are placed. In this case, the snubbers
mantain a 4.5mAac/9.0mAac current when connected to a 120VAC/220VAC circuit.
This current is enough, in certain casses, to power a horn or alarm lamps, preventing
their deactivation. In this situation, there is no need to use the snubbers and the
jumpers must be removed.
4.4 - Optional Module Connections
The DCY-2057 Controller may be provided with up to four output signals plus
communication. For that purpose, the corresponding optional modules should be
installed inside the instrument. By opening the Controllers as explained in section
4.1, access is gained to 4 plug-in connections on the Power Supply Board, plus one
plug-in connection on the CPU Board (see figure 34).
Plug-in for output 2
Plug-in for output 1
Plug-in for output 4
Plug-in for output 3
Plug-in for communication
Power Supply Board
CPU Board
Fig. 34 - Optional Module Connections
Maintenance
Page 53
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