Pp 45 Lt Power Unit; Modbus Interface (Building Control System Connection); Operation With An Odd Number Of Units - Maico PP 45 O Installations- Und Inbetriebnahmeanleitung

9 System expansions – Connection of further components
The PP 45 EO EnOcean module can only be
taught-in with the commissioning software
(RLS 45 K). This activates the teaching mode
and sends a radio telegram. All radio sensors/
radio switches are taught-in directly on the
PP 45 EO. Only the EnOcean module is taught-
in on the master.
→ Commissioning [} 47] or Commissioning soft-
ware [} 50].

9.5 PP 45 LT power unit

The RLS 45 O / RLS 45 K power unit is connec-
ted to the RS 485 interface.
Up to 3 additional PP 45 LT power units (power
modules) can be added to a PP 45 / PPB 30 sys-
tem. 3 unit pairs (6 units) can be connected to
each power unit.
The first RLS is operated as the master and is-
sues the commands. The slave controls can per-
manently change the commands.
This allows systems to be produced with up to
24 wired PP 45 ventilation units (6 + 3*6 = 24
ventilation units). For PPB 30 systems, the num-
ber of units is reduced accordingly (max. 3 PPB
30, 1 PPB 30 = 2 units (since there are 2 fans per
PPB 30).
For permissible cable lengths → Technical data
[} 37], for permissible cable types for connecting
cables → Installation instructions for final installa-
tion kit.
The power units are connected to the plug-in con-
nection terminal of the room air control → Installa-
tion instructions for final installation kit, connec-
tion diagrams.
Recommendation: When connecting more than
2 PP 45/PPB 30 units, carry out the unit connec-
tions in a separate flush-mounted box. Generally
speaking, install the RLS control in a deep flush-
mounted box.
All ventilation units of a group (Fan1 or Fan2) for
the entire ventilation system run together in ventil-
ation and air extraction mode.
The addressing of power units takes place each
time with a push of the power unit's [} 42] button
[T].
9.6 ModBus interface (building con-
trol system connection)
For a building control system connection, the
RS 485 interface of the RLS 45 O / RLS 45 K
control must be reconfigured as a Modbus inter-
face. The RS 485 bus is therefore no longer avail-
able.
The Modbus interface is activated in service
mode or using the Commissioning software
[} 50]. The interface is set up with baud rates of
9600 or 19200 and addresses 10 to 50.
If the RS 485 interface is configured as a
Modbus interface, no further components
(ventilation units, sensors, power units, room
air controls etc.) can be connected at this in-
terface.
9.7 Operation with an odd number of
units
Carry out electrical connection on the Fan1 and
Fan2 connections.
When connecting 3 or 5 ventilation units:
• connect the larger number of ventilation units (2
or 3) to the "Fan2" group and
• connect the smaller number of ventilation units
(1 or 2) to the "Fan1" group.
When operating with an odd number of units, the
volumetric flow required of the "Fan2" group is
automatically compensated for by the "Fan1"
group.
In cross-ventilation operating mode, ventilation
units of the Fan1 group (exhaust air) are operated
with a higher volumetric flow. Volumetric flow
compensation is automatic in demand-driven
automatic operation
→ Commissioning [} 47] or Commissioning soft-
ware [} 50].
45