LTDVE8CH-20 – INSTRUCTION MANUAL
8
SupplyVoltage
is the actual supply voltage (from 24 V to 48 V)
DutyCycle
is the actual duty cycle
The duty cycle is given by:
DutyCycle [·] = PulseWidth [s] * TriggerFrequency [Hz]
If the output is driven in continuous mode, the previous equations are still valid but the parameter
DutyCycle
becomes one because the output is always active.
The parameters
LightCurrent
and
LightVoltage
are light specific and should be either given in the
light documentation or measured experimentally.
7.2. Reducing generated heat
The total heat generated by the controller is simply given by adding the generated heat for each of the
eight channels, as calculated in the previous section.
There are several ways to reduce the heat generated by the controller. The simplest way would be to
turn the light off when not needed. If the light is on only when necessary the generated heat can be
drastically diminished. Another opportunity would be to reduce pulse width or output current, if
permitted by the application.
Another strategy to reduce the generated heat would be to connect lights in series instead of parallel,
if possible. If you have several lights connected in parallel then changing the arrangement to series
will increase the voltage across them but also reduce the overall current.
The last option, feasible with this eight channels controller, would be to use two or more controllers
and use just a few channels from each. For high power applications this may be the only solution.
8. Connections
See the next sections for information about connections. All connections are made via screw terminals
on the front panel of the controller. Check all connections carefully before switching on the
equipment.
The controller has two 24 V to 48 V supplies for the power and logic sections. This is to increase
versatility. Supply to the logic section should always be present, while supply to the power stages can
be cut off at any time. Supply to the power stages can be removed to protect the end user from photo-
biological hazard and other dangerous situations that may happen during fault conditions.
These two supplies can be connected together if convenient. For convenience, they share a common
negative terminal.
8.1. Layout of connectors
The drawing in
Figure 1: connectors on the controller front panel
connections, which are easily accessible on the front panel. As indicated in the drawing, connectors
are identified by their unique designators (P1, P2, P3, P4, P5, P6, P7 and P8).
