wtw IQ SENSOR NET System 2020 XT, Руководство по эксплуатации, Страница: 31 / 216

System 2020 XT C
ONNECT
Installation
3 - 3
ba75970e01 10/2012
3.4 Basic requirements for optimum installation
3.4.1 General information
The IQ S
ENSOR
N
ET
supplies all components with low voltage as well
as digital communication via a shielded 2-wire line.
Due to this characteristic, the following factors must be taken into
account in the planning of an IQ S
ENSOR
N
ET
system:

Power consumption of all components (power rating). Primarily, this
determines the number of power supply modules required
(section 3.4.2).

Distance of the components from one another. Large distances may
require a further MIQ/PS power supply module and/or an MIQ/JBR
signal amplifier module (section 3.4.3).

Placement of the MIQ/PS power supply modules in the
IQ S
ENSOR
N
ET
(effect on the power supply - section 3.4.3).
Note
Only IQ S
ENSOR
N
ET
products may be used in the IQ S
ENSOR
N
ET
.
3.4.2 Drawing up the power rating
Power rating - why? All components in the system require a specific level of electrical power
for operation. Thus, it is necessary to draw up a power rating after
selecting the desired components. At the same time, this can deter
-
mine whether the entire power requirement of all components (con
-
sumers) is covered by the existing MIQ power supply modules. If this is
not the case, the power available in the system must be increased by
further MIQ power supply modules.
The total power requirement P of all consumers can be determined
from the following table:
The power rating provides an initial guide value. In specific
limiting cases, the power supply may be insufficient despite
the positive power rating. Long cable lines, for example,
result in additional power losses that may have to be com
-
pensated by further MIQ power supply modules. This can
be checked for the planned installation by following
section 3.4.3.