Dräger Regard 3900, Instructions For Use Manual, Page: 53 / 292

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_ REGARD
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3900
Components _
The input module terminals are:
– Ch1 to Ch4 are channels for 4–20 mA remote sensor transmitters in 2- or 3-wire
technology.
– A1, A2 and Fault (F1) are terminals for the input module relays.
– RR are the terminals for remote acknowledgement, via which a switch that is
normally open is connected outside the control unit, which has the same
purpose as the button
Acknowledge / OK .
During installation, each input module is configured with another module number
(1–4) to define the channel numbers (1–16) within the evaluation system. For
further information see: "Numbering the control modules", page 62.
Each input module requires a 24 V DC supply via cable, which is provided together
with the module. For further information see: "Connecting control modules and
display PCB", page 63.
4.3.1 Input module relay settings
The settings for the input module relays are preset or can be defined during the
configuration as follows:
– All input module relays are non-acknowledgeable.
– The A1 and A2 relays are activated in the event of an alarm.
– The F1 relay normally has current flowing through it and is tightened (normally
energized). In the fault-free operating state (power supply present), NC and
COM are connected. Drop-out in case of fault, e.g.: Supply voltage is less than
6 V.
– Each relay can be set as latching or non-latching during the configuration.
4.4 Relay module
A relay module is used for the activation of external warning devices (alarms, fans
or other safety equipment), if the REGARD
®
3900 control unit records alarm or fault
conditions. The module has eight zero potential, single pole changeover relays, one
of which is a non-configurable system fault relay (RL1) and seven of which are
configurable relays (RL2 to RL8).
RL1 to RL8 are the terminals for the relay module relays.
During installation, each relay module is configured with another module number (1
or 2) to define the relay numbers (1–16) within the evaluation system. For further
information see: "Numbering the control modules", page 62.
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