MEDC DB4B Technische Bedienungsanleitung Seite 4

Access to Terminals
On Ex d versions, the cover is secured with 6 off M5 cover screws (4.0mm A/F hexagon key). Once the cover
fixings are unscrewed, the cover can be lifted away from the enclosure to gain access to the interior. The cover
fixings are captive and will remain in the cover.
On Ex de versions the removable cover is secured using 3 off M5 cover screws (4.0mm A/F hexagon key). Once
the cover fixings are unscrewed, the cover can be lifted away from the enclosure to gain access to the interior. The
cover fixings are captive and will remain in the cover. All terminal screws, used and unused, shall be tightened
down.
Once termination is complete, carefully replace the cover assembly back onto the body, avoiding damage to the
mating surfaces. Tighten the cover screws evenly. On Ex de certified versions, ensure the maximum torque value for
the cover screws is observed, as marked on the Ex e cover. Ensure the O-ring is seated correctly on the cover
during re-assembly. On Ex d certified versions, ensure the required maximum gap of 0.04mm is maintained
between the cover and the base once assembled.
Wiring details
DB4B STANDARD Ex d WIRING DB4B STANDARD Ex de WIRING
For standard units, connect power connections to numbered terminals to obtain power tapping required (see section
4 for tapping table). For loop-out connections, use second set of numbered terminals.
DB4B 8Ohm Ex d WIRING DB4B 8Ohm Ex de WIRING
For direct connection 8 Ohm units, connect power from amplifier to terminals as detailed, taking note of maximum
Loudspeaker rating. Use second pair of terminals for loop-out connections as required.
© MEDC 2014
04/14