20
Fault Diagnostics
Operating Manual
HUB24 Series Dimmer
5
Fault Diagnosis
NOTE
Contact your authorised JANDS Distributor for repairs or servicing.
In Australia refer all repairs to an authorised JANDS service agent or return the faulty
unit in suitable packaging to:
JANDS Electronics Pty Ltd
Service Department
40 Kent Rd
MASCOT NSW 2020
Phone +61-2-9582-0909
Fax +61-2-9582-0999
5.1
Protection
The HUB24 series dimmers feature several types of protection. These can be generally
classified as:
•
RCD protection
•
Output protection
•
Thermal protection
•
Neutral to Earth Overvoltage protection
5.1.1
RCD protection
The HUB24 protects against earth current faults with two Residual Current Detectors
(RCDs).
These disconnect all three phases when a very small fault current is
detected. Both RCDs should be tested regularly by pressing the test buttons.
The left hand RCD protects the dimmer outputs and right hand RCD protects the
power distribution outputs.
Note: The test button will not trip the RCD if the HUB is powered from a single
phase supply.
5.1.2
Output protection
Each of the dimmer circuits are protected by a fast-acting thermal magnetic circuit
breaker. These breakers are designed to pass the rated current, but will disconnect the
output circuit for any overload condition (the larger the overload, the quicker the
disconnection).
There are 3 power distribution circuits, with 3 sockets on each circuit. Each circuit is
protected by a fast-acting thermal magnetic circuit breaker.
The breakers protect the dimmer’s output devices from short-circuit loads and faulty
wiring looms, and save on expensive dimmer repairs. A tripped circuit breaker
indicates a load fault that requires immediate attention.
