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Guidelines for station planning
Hans Turck GmbH & Co. KG | T +49 208 4952-0 | F +49 208 4952-264 | [email protected] | www.turck.com
34
7.2
Power supply
7.2.1
Power supply to the gateway
The gateway is supplied via the push-in cage clamp terminals on the gateway (
).
7.2.2
Module bus refreshing
The number of BL20 modules, which can be supplied via the internal module bus by the gateway or
a Bus Refreshing module depends on the modules’ nominal current consumptions at the module
bus.
With the system supply, it must be ensured that the same ground potential and ground connections
are used. Compensating currents flow via the module bus if different ground potentials or ground
connections are used, which can lead to the destruction of the Bus Refreshing module.
All Bus Refreshing modules are connected to one another via the same ground potential.
The power to the module bus is supplied via the connections 11 and 21 on the base module.
If the power supply from the module bus is not guaranteed, the software I/O-ASSISTANT 3 (FDT/
DTM) generates an error message if the user activates the DTM "Additional functions
Verify sta
-
tion".
7.2.3
Creating potential groups
Bus Refreshing and Power Feeding modules can be used to create potential groups. The potential
isolation of potential groups to the left of the respective power distribution modules is provided by
the base modules. Ensure that the correct base modules are planned for when using Bus Refreshing
modules.
NOTE
The sum of the nominal current consumptions of the modules following directly the gate
-
way BL20-E-GW-CO must not exceed 700 mA. If a Bus Refreshing module is mounted, the
sum of the current consumptions which follow the Bus Refreshing module must not
exceed 1,5 A.
NOTE
The Bus Refreshing modules which are used in a station with BL20-E-GW-CO have to be
combined with the base modules BL20-P3T-SBB-B or BL20-P4T-SBBC-B (tension clamp) or
with the base modules BL20-P3S-SBB-B or BL20-P4S-SBBC-B (screw terminals).
NOTE
The system can be supplied with power independent of the potential group formation.
Summary of Contents for BL20-E-GW-CO
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