Wiring Notes; Permissible Line Lengths And Cross Sectional Area - Siemens OpenAir GBB Series Technical Basics

Introduction
Note
Permissible voltage drop
Notes on the G0 line
(GEB16..1)
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Siemens
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6

Wiring notes

Prior to wiring, study all information in the following sections:
·
"Safety notes" in section 4.1
·
"Device-specific regulations" in section 4.2
·
"Notes on EMC optimization" in section 4.3
·
"Connection Diagrams" in chapter 9, and the
·
HVAC plant diagram.
6.1 Permissible line lengths and cross
sectional area
The permissible line lengths and cross-sectional areas depend on the actuators' power
consumption and the voltage drop of the connection lines to the controller. Determine
the necessary line length from the following diagram and the formulas.
To determine the line length and cross-sectional area, adhere to the permissible
operating voltage tolerance at the actuator (see chapter 8 Technical data) in addition to
the permissible voltage drop between the signal and supply lines (see table below).
The line sizing between the controller and the actuators depends on the actuator type
used and is determined on the following basis.
Type Operating voltage
GBB/GIB13..1 AC 24 V
GBB/GIB16..1
AC 24 V
GIB161.1E/MO
GBB/GIB33..1 AC 230 V
Consider the following criteria:
·
For modulating control:
The permissible positioning signal error caused by a voltage drop in the line current
on the G0 line must not exceed 1%.
·
The G0 line's voltage drop caused by surges in the DC circuit in the actuator may
not exceed 2 Vpp.
·
In the case of improper sizing of the G0 line, actuator load changes may cause
natural oscillation due to a change in the DC voltage drop.
·
The supply voltage loss at AC 24 V may not exceed 8 % (4 % across G0 line).
·
DC voltage drop across the G0 line is caused as follows:
Asymmetrically in the internal actuator supply (approx. DC 8 mA)
-
Positioning signal current DC 0.1 mA (from Y = DC 0...10 V)
-
Positioning signal current DC 1 mA (from U = DC 0...10 V).
-
·
It can be ignored for the following aspects.
Rotary actuators without spring return GBB/GIB..1
Wiring notes
Line Max. permissible voltage drop
G, Y1, Y2 4 % each (tot. 8 %) of AC 24 V
G0, G 4 % each (tot. 8 %) of AC 24 V
G0, Y, U 1 % of DC 10 V
L, N 2 % each (tot. 4 %) of AC 230 V
CE1Z4626en
2019-11-28