Lenze ETCxxxxx - Manual (Page 17)

Device description
System overview
Layout example for an ETC island
3
3.1
3.1.2
l
17 EDSTCXX EN 2.0
CAN bus terminated
1. isolated system
max. CAN bus length
Control
CAN Master
2. isolated system 3. isolated system
ETC024
Several ETCHx islands can be connected to form a complete system. Please
note the maximum permissible cable length per CAN level dependent on the
Baud rate (
¶ 56). The maximum number of modules in one ETCHx island is
limited by the following constraints.
CAN Bus max. 127 modules
Module address max. 16 modules of the same type
Power supply
unit In practice the capacity of the power supply unit is the decisive factor for
the maximum number of modules in an island. The current consumption of
the individual modules both via the 24 V and the 5 V supply is relevant and
must be taken into account.
Typically 15 modules can be supplied with one power supply unit
ETCHN003.
The power consumption of the individual modules fromthe 5 V voltage
produced in the power supply unit is shown in the following table.
The figure for "typ." refers to the 24 V supply voltage and with a high signal
being present at half the digital inputs and outputs.
The figure for "max." refers to the 32 V supply voltage and an operating state
with maximum power consumption.
Module 5 V internal bus 24 V internal bus 24 V external (no load)
typ. max. typ. max. typ. max.
ETCHU00895 mA 180 mA 15 mA 30 mA 30 mA 80 mA
ETCHU016 130 mA 240 mA 25 mA 55 mA 60 mA 160 mA
ETCHI008 70 mA 90 mA 90 mA 105 mA − −
ETCHI016 90 mA 120 mA 145 mA 175 mA − −
ETCHA022 150 mA 160 mA 60 mA 80 mA − −
ETCHU008/016: Outputs fed externally.
ETCHI008/016: Eingänge intern gespeist.
The ampacity of the cables and plug−in connectors of the internal system bus
is at least 8 A (per cable). The direct plug−in connections between housing
and PCB can accept a load of 3 A.