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1. LEGAL WARNINGS
- Read the complete manual before attempting installation and activating the system.
- The installation has to be carried out by a registered installer and in compliance with the statutory regulations.
- This user manual has to be handed over to the user. It has to be included in the electrical installation file and
has to be passed on to any new owners. Additional copies are available on the Niko website or via the support
service.
- During installation, the following has to be taken into account (not limited to list below):
- The statutory laws, standards and regulations;
- The state of the art technique at the moment of installation;
- This user manual, which must be read within the scope of each specific installation, only states general
regulations;
- The rules of proper workmanship
- In case of questions, you can consult Niko's support service or contact a registered control organisation.
Support Belgium:
Support Slovakia:
+32 3 760 14 82
+421 263 825 155
website : http://www.niko.be
e-mail: niko@niko.sk
e-mail: support@niko.be
In case of a defect, you can return your product to a registered Niko wholesaler, together with a clear description
of your complaint (Conditions of use, stated defect...).
2. DESCRIPTION
Regulating the intensity of lamps ('dimming'). These appliances are designed solely for professional use. This
dimmer operates with power transistors according to the reverse phase control principle. Because the interfer-
ence suppression is fully electronic and no chokes are used, these dimmers are completely silent and up to
30% lighter than coventional dimmers. The technology used enables the dimmer to be electronically protected
against short circuits, overcurrent and overvoltage. These dimmers are remotely controlled by an analog signal
(e.g. by a Nikobus 05-007). This dimmer can be remotely controlled by any appliance that complies with the
international 0/10V (voltage control) and the 1/10V (current control) standard. Operation is analog (0V = off,
10V = 100 % on).
3. SETTINGS
3.1. Trimmer 1: maximum or 'top set'
This potentiometer can limit the maximum voltage to the lamps, e.g.: 230V x 50% = 115V. Reducing the voltage,
e.g. by the maintenance factor, saves energy.
Adjustment: Set all control signals to max. (10V). Turn from min. (counterclockwise) to max. (clockwise). In the min.
position, the intensity of the lamp is clearly lower than in the maximum position. You can measure the voltage if
necessary. The trim potentiometer is then returned to max. Repeat this operation for every channel.
3.2. Trimmer 2: minimum or 'preheat'
The preheating is adjustable to ±115V. The preheating is of prime importance for the reaction speed of the
dimmer: the more preheating, the warmer the lamps and the quicker the dimmer reacts (see '4.3.4. LED 3 lights
(red)'). If you want the dimmer to not reach an imperceptible light level without the supply voltage being switched
off, this can be set using this trimmer.
Adjustment: Set all control signals to min. (0V). Turn from min. (counterclockwise) to max. (clockwise) using a
miniature screwdriver. In the max. position, the lamp must be clearly lit. Measure the voltage if necessary. The
control is then set so the green LED is no longer lit. This point must correspond roughly with the central position
of the trim potentiometer. This operation is repeated for each channel.
3.3. Preheat and top set values with control signal at max. (10V)
top set min.
top set max.
preheat at min.
0V
230V
preheat at max. 180V
230V
3.4. Preheat values with control signal at min. (0V)
top set min.
top set max.
preheat at min.
0V
0V
preheat at max. 80V
80V
4. OPERATION AND USE
4.1. On/off switch (ON)
The on/off switch controls an internal contactor. This means that the appliance is switched off electrically, with the
exception of the electronics which monitor the power supply input (see '4.9. Protecting the 400V power supply').
The contactor only interrupts the three supply phases. The neutral wire is not interrupted. If the appliance's power
supply is switched on, the green LED above the switch lights.
4.2. Reset button
The reset button is used to reset the dimmer again after each protection is activated, such as: reset after
shortcircuit or overcurrent protections... (see '4.3.Operational and fault monitoring by LEDs'). The reset button
is used to reset each circuit which is in protection mode.
4.3. Operational and fault monitoring by LEDs
The dimmer is provided with a visual monitoring function for each circuit consisting of 3 LEDs per circuit on
the front of the dimmer.
Note: all protection systems are activated when the mains supply is switched on (yellow LEDs light). During a
procedure which lasts several seconds they are deactivated one after the other. The dimmer does not react to
the signal from the remote control as long as all controls have not been successfully completed.
4.3.1. Green LED top left: electronic monitoring of the supply (see '4.9. Protecting the 400V power
supply').
If 'on', this indicates a correct supply. If 'off', the supply has been disconnected and the dimmer is unable to
operate.
From top to bottom:
green
yellow
overvoltage protection mode
red
overcurrent protection mode
4.3.2. LED 1 lights (green): indication of the control signal.
If there is a control signal, this LED will follow the intensity of the control signal.
4.3.3. LED 2 lights (yellow): overvoltage protection
The protection is active from 450V. If the yellow LED lights, this indicates that the protection is operational. This
protection does not switch off the dimmer, but limits the voltage passing through it. In practice the intensity of
the lighting is limited (= dimmed). If the protection is activated briefly, this can indicate a transitional or temporary
phenomenon. If the dimmer remains in protection mode, the fault must be investigated and rectified. If abnormal
induction peaks occur the voltage will automatically be limited. This can be attributed, for example, to sudden
defect in a magnetic transformer, or to an open secondary winding of a transformer (idle transformer due to end
of lamp life...). If the protection operates constantly, this can indicate an excessively high inductance of the load.
In this case it is sufficient to connect one or more capacitors in parallel across the load. Use e.g. a capacitor of
1 microfarad, 250VAC, X-2 class, to compensate a transformer of 12V 50VA.
4.3.4. LED 3 lights (red): active overcurrent protection.
If the red LED lights, this indicates that the protection is operational. As long as there is no short-circuit, this
protection will not switch off the dimmer. The protection limits the current passing through the dimmer to 55A.
nv Niko sa
control signal
Industriepark West 40, BE-9100 Sint-Niklaas, Belgium — tel. +32 3 760 14 70 — fax +32 3 777 71 20 — e-mail: support@Niko.be — www.niko.be
In practice the intensity of the lighting is limited (= dimmed). This protection can be activated in the following
situations:
Switch on surges:
If the lamps are switched on cold, this protection ensures that the lamp is switched on slowly. The lamps are
therefore preheated before being switched on fully. Because this is an active protection (the current is constantly
measured) the switch on speed will depend on three factors:
- the resistance of the load (dependent on the type of lamp)
- the temperature of the lamp (the more preheating, the quicker the dimmer reacts, see '3.2. Trimmer 2:
minimum or preheat')
- the total load (the smaller the load in relation to the maximum permissible power of the circuit, the faster the
switch on time)
Short-circuit:
If there is a short-circuit, the relevant circuit will automatically be switched off. The dimmer switches on automati-
cally if the short-circuit has disappeared within two seconds. If the short-circuit lasts any longer, the reset button
must be used (see '4.2. Reset button').
Note: this protection is not intended for people. An external automatic protective device must always be provided.
Only the breaking power of the automatic breaker is of importance for the operational safety of the dimmer, not
any of the other characteristics.
4.4. Thermal protection (overtemperature)
The dimmer is provided with two joint indications by means of LEDs on the front. If the right (red) LED blinks, this
refers to the thermal protection. The temperatures of the left (circuits 1 to 3) and right (circuits 4 to 6) cooling
surface are measured separately and secured. If the temperature of the cooling surface in question rises above
75°C, this group is switched off. The red LED denotes this protection and the 3 green LEDs denote the group
(LEDs 1 to 3 and/or 4 to 6 switched off).
4.5. Thermal protective device for transistors
To guarantee total protection, each power transistor is individually protected by a thermal switch. If the transistor
is too warm due to a defect, this thermal protective device will switch off the contactor. The entire appliance is
then switched off. Set the control signals to 0 and restart the dimmer using the ON/OFF button (see '4.1. On/off
switch'). After switch on there are two possibilities:
- the faulty circuit remains on constantly: transistor must be replaced
- the circuit no longer works: thermal protective device and transistor must be replaced.
Disconnect the load immediately from that particular circuit until the repair has been carried out.
4.6. Control signals
4.6.1. Control signal 0/10V
Standard (default) setting of the control signal. In this setting the dimmer will accept a voltage control signal from 0
to 10V in accordance with IEC standard 1131-2. From 0 to 10V it is possible to dim the light from 0 to 100%.
4.6.2. Control signal 1/10V
Each control circuit can be separately switched to the 1/10V control signal by means of an internal contact (see
fig. 1). In this position the dimmer operates via a current control signal from 1 to 10V in accordance with the
EN60929 standard. From 0 to 1V it is not possible to dim the light. From 1 to 10V it is possible to dim the light
from 0 to 100%. Below 1V the dimmer is switched off (functions as a solid-state relay).
4.6.3. Test function
First possibility: use the minimum setting as a control potentiometer (see '3.2. Trimmer 2: minimum or preheat').
Second possibility: use the internal contacts (this test function may only be implemented by technical personnel
in the specified order):
1 interrupt supply voltage
2 disconnect control signal (loosen connector: see '4.6.4. Connecting control signals')
3 set control signal in 1/10V mode (see '4.6.2. Control signal 1/10V' )
After switching, on the dimmer will slowly fade in to 100% and thereafter remain on constantly. This function
can also serve to switch on the lighting during the progress of the installation.
4.6.4. Connecting control signals
The connection is made via a standardised female sub-d connector of 15 contacts. This connector is supplied.
Contact no.
Function
1
control signal circuit 1
2
control signal circuit 2
3
control signal circuit 3
4
control signal circuit 4
5
control signal circuit 5
6
control signal circuit 6
12
supply output 24V max. 20mA for external control
15
0V (common)
Note: do not connect the unused contacts. The same contacts are also used for 1/10V current control (see
'4.6.2. Control signal 1/10V'). The polarity must be observed. Never swap the '-' and '+' if several dimmers are
connected to the same control output. The control input is separated galvanically. Current control signals can
ONLY be paralleled on the dimmer side. It is not possible to connect a dimmer simultaneously to several 1-10V
control outputs (e.g. several electronic potentiometers). It is however possible to connect several dimmers to 1
control. Voltage control signals can ALWAYS be paralleled. Dimmers may be connected in parallel to several 0-10V
control systems. Only in this situation are all combinations possible (highest signal has priority).
Warning: the dimmers are never electrically separated from the mains supply by operating the control. All
components, including the lamps, therefore remain live even when the light is 'off'. Signals that are sent via the
mains grid (power modem') can interfere with the operation of the dimmer. This interference only occurs when
this signal is sent via the mains grid.
4.7. +24V low-voltage supply output
Pin no. 12 of the sub-d connector is provided with a low-voltage supply output: this supply can be used to supply
an external control unit: max. load 20mA, rated voltage 24V DC.
4.8. Mains connections
The dimmer comes with a power supply cable 4 x 4mm
internally to the contactor.
3 x black:
400V phase (supply)
blue:
400V neutral wire (supply)
directly via supply terminal
yellow/green:
earth
directly via supply terminal
Attention: if the cable is replaced it must be ensured that the additional wiring for the supply monitoring elec-
tronics (see '4.9. Protecting the 400V power supply') is properly connected in the same terminals as the power
supply wires. Before switching on check that all connections are secure. When carrying out maintenance on the
installation the pressure force on the terminals must be checked. A strain relief for all incoming and outgoing
cables must be provided in the electrical distributing board.
4.9. Protecting the 400V power supply
The dimmer is equipped for a supply voltage of 3 x 400V and a rated voltage of 230V between phase and neutral
wire. An electronic circuit monitors the input voltage and controls the contactor which connects the supply to all
other components. The contactor is engaged automatically after the control routine and the green LED at the top
right lights. The contactor is switched off automatically and the green LED goes out if a fault occurs such as:
- wrong connection of the phase or neutral wire;
- wrong voltage between phase and neutral wire (i.e. voltage other than 230V present);
+ 4mm
and 1.5m in length. This is connected
2
2
via contactor
PM127-099R07103
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