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PRESYS
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Instruments
(*) In the case of input under a voltage from 0 to 10V the second factory supplied
jumper should be stored by the user away from the instrument or simply engaged to
one of the connector pins, in a dummy position as illustrated on figure 32.
Location for jumpers 1 to 4
Fig. 32 - Jumpers on dummy positions for a 0 to 10V input
4.3 - Snubber Use for Relay
Relay modules are provided with circuits for eliminating electrical arch (RC
snubber). The snubbers are put in parallel with the relay contacts, by placing the
jumpers J1 and J2 localized on the back of the relay board. When the jumpers are
not placed, the relay contacts are kept without snubbers. The relay module is sent
from factory with the jumpers placed.
Note the position of the jumpers in the following figure.
Fig. 33 - Jumpers for selection of snubbers on the relay board
Alarm and control relays are extremely critical in control and safety of industrial
processes. In order to ensure the expected relay behaviour, consider the following
two loading conditions.
• High currents circulating through the relay contacts (from 20mA to 3A). When the
relay switches high currents there is the occurence of elecrical arch which damage
quickly the relay contacts. Besides, electrical noise is generated. In these conditions,
it is recommended to use the RC snubbers which come with the relay module (placed
jumpers).
DCY - 2057 Pressure Controller
C29
Jumpers on dummy positions
Location for jumpers 5 to 8
Maintenance
Page 52
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