LENZE E82ZAFSC100 E82ZAFSC100 E82ZAFSC100 E82ZAFSC100 E82ZAFSC100 E82ZAFSC100

ontrol of the traffic lights and the barriers as a function of the air pollution level in the tunnel
The tunnel entries are controlled via two traffic lights. The traffic light control also requires
higher availability for safety reasons.

If the pollutant concentration exceeds a maximum limit for more than 2 minutes in a tunnel
section, then the tunnel is blocked.
Control of the lighting in the tunnel as a function of the illuminance of the outdoor light
The abrupt transition between light and dark at the entry to the tunnel is compensated for by
tunnel lighting in the various tunnel sections. Two light sensors measure the light intensity
outside the tunnel. The light intensity of the entry lights in the tunnel is controlled accordingly.
The interior lights in the tunnel are controlled by the prevailing daytime / nighttime.When a CPU fails in redundant operation, the other CPU maintains control over the
tunnel operation.
3 ET 200SP as IO devices in the PROFINET ring
An ET 200SP (IO device) distributed I/O system is found in every tunnel section (1 to 3).
Sensors and actuators are connected to each IO device for the following tasks:
● Measurement of the pollutant concentration and as a function thereof:
– Control of the fan speed and air flow
– Control of the traffic lights and barriers
● Measurement of the light outside the tunnel:
– Control of the entry lights
● Control of the interior lights in the tunnel, depending on the day / night time.
2 Comfort Panels
The Comfort Panels are used by operators as a control center for monitoring tunnel
operation.Every fan:
● has two speeds (stages), which are switched on or off depending on the measured
pollutant concentration.
● has 2 directions of rotation. Depending on whether pollution is measured, the fan must
blow or suck.
The H-CPU measures the pollutant concentrations in the tunnel via analog input modules
and air-quality sensors.
If the pollutant concentration exceeds the maximum limit, the H-CPU responds in ET 200SP
via digital output modules as follows:
● It increases the speed of the fan motors
● It switches the traffic light system to red after two minutes
● It closes the barriers after two minutes
If the pollutant concentration falls below an average limit, the H-CPU responds in ET 200SP
via digital output modules as follows:
● It switches the ventilation motors to stop
● It switches the traffic lights to green
● It opens the barriers

Controlling the lighting in the tunnel
The H-CPU measures the light intensity outside and inside the tunnel using analog input
modules. Depending on the outdoor light, digital output modules adjust the brightness of the
entry lights in the tunnel to the optimum vision conditions. The digital output modules also
control the interior lights in the tunnel, depending on the day / night time.
The user program in the CPU specifies limits and controls the input and output modules of
the ET 200SP.
The Comfort Panels visualize the H redundant system in an HMI screen. If required,
the operator can switch to manual operation via the HMI screen and change limit values.As an alternative to H, you can use an R redundant system for the solution
to the automation task. In this example, the H redundant system is used as it offers
the following advantages for tunnel automation:
● much higher performance than R with:
– separate redundancy connections over fiber-optic cable
– high computing power
– a higher number of PROFINET devices can be used
● distance between the two H CPUs up to 10 km
Advantages and benefits of the solution
● High availability of the system: If an