ADB EURODIM TWIN TECH, Installation Manual

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EURODIM TWIN TECH
www.adblighting.com Installation manual - Page 32
Version 1.2
Switch Off before unplugging
Since a dimmer module is rated above 32 A, hot patching of modules
is forbidden by IEC EN 60439 and local regulations such as
NF C 15-100.
It is highly advised that one must switch off the dimmer protection
(MCB, RCD, RCBO) before withdrawing or positioning a module.
Additionally, the breaking of the contacts is sequential: first control,
then power, and Earth last.
ADB has taken precautions that there is a minimal impact in case this rule is forgotten. When
a module is plugged into the cabinet
– first the protection earth is connected, then the supply
and load supplies are connected and finally the control wiring connection is performed. This
is to avoid that any sparks are pulled because the dimmer has been accidently fired.
8.7 Dimmer module protection by HRC fuse
Each power module is protected by a High Rupturing Capacity supply fuse (HRC, 63 A,
50 kA). This HRC fuse is located in the supply cabling compartment, on the left hand side of
the cabinet.
Each individual circuit is supplied through an MCB or RCBO (MCB+RCD), in the module.
See next paragraph.
The protection in the main switchboard must be selected to ensure a proper fault current
protection in relation with the line distribution short circuit current.
8.8 Dimmer protection by MCB
All ADB EURODIM Twin Tech power modules are standard equipped with MCBs per dimmer
channel. The MCBs comply with EU rules and protect the wiring against overload and short-
circuit.
Please note that in unfavourable fault conditions, both the dimmer MCB and the HRC supply
fuse may trip. In the event of severe damage to the thyristor modules, additional protection
circuitry may intervene and will limit the fault to the dimmer cabinet.
The dimmer module should be removed or repaired first. Other elements should only be
checked after the faulty dimmer is removed or repaired.
8.9 Residual Current Devices (RCD Ground Fault Protection)
EURODIM Twin Tech DimSwitch Thyristor modules are optionally available with an RCD per
module, or an RCBO (MCB+RCD) per dimmer.
Warning: RCDs and common Neutral wires.
To solve a particular problem, or with some multicore lay-outs, you
may consider using a single (large size) Neutral wire for a group of
dimmers.
If the RCD protection is provided, then the following rule applies: the
“common neutral” should be common only to dimmers supplied by the
same RCD. Failing to do so will invariably result in nuisance tripping of
an RCD.