Dräger REGARD 3900 Series Instructions For Use Manual page 20

Installation & commissioning
5.6 Installation of the control modules
Output modules are not part of the ATEX EC type examination of the REGARD
3900. If an output module is installed, the control unit must not be used to monitor
measures against explosion hazards.
The control unit can contain up to six control modules.
When installing control modules, observe the following:
– Use the short foot screws for the lower level, the long foot screws for the middle
level and the long foot screws and plastic spacers for the upper level. (All screws
have a M3 thread.)
– Do not connect any control modules outside the operating console of the control
unit of the REGARD
– See also the separate assembly instructions supplied for installing the control
modules for a REGARD
5.6.1 Combining the control modules
Combining the control modules must meet the following requirements:
– Max. 6 control modules (input, relay and output modules together)
– Max. 4 input modules
– Max. 2 relay modules
– Max. 4 input modules and relay modules together
– Max. 4 output modules
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3900 and 3920 series.
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3910 control unit.
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REGARD 3900