MSA SUPREMATouch MCP 20, Руководство по эксплуатации

Страница: 145 / 241

145
Installation
GB
SUPREMATouch
Standard System with 64 Inputs/8 Common Alarm Relays
Fig. 84 Configuration example 3
Standard System with 32 Measurement Sites, Redundant Design
Fig. 85 Configuration example 4
12.8 Systems Consisting of Several Racks
Systems with Central Recording of Measuring Values
In systems with several racks, which are not isolated from each other, the following points should
be kept in mind:
• Each rack must have a guaranteed voltage supply. The GND-connectors of all racks must be
interconnected.
• When the central unit or the satellites consist of several racks, in each rack-group the GND-
connectors must be interconnected.
• The racks must be connected to each other by a CAN bus and the system fail relay must be
connected and monitored on each rack.
• The racks are connected via the MST modules on the rear with ready-made CAN bus cables.
• For a “multi-rack” system, contacts 1 and 2 (CAN-A, CAN-B) of the DIL switch on the MIB
module in the last rack–i.e., the one where the CAN bus ends–should be closed. All DIL switch
contacts 1 and 2 (CAN-A, CAN-B) on the racks in between must be open (Chapter 12.6
"Module Configuration").
• The setting of the CAN bus bit rate must be the same for all racks and should correspond to
the standard settings defined for the total number of inputs in question (Chapter 12.6 "Module
Configuration").
• Each rack must have it own CAN node number. The standard setting for the first rack is 111
(Chapter 12.6 "Module Configuration").
• In case of non-redundant systems, the standard practice is to use the CAN-A bus connection;
when a redundant system is built, the CAN-B is also connected (Chapter 15 "Redundant
Systems").
• A cooling fan must be installed and operated to cool the installation framework if more than 32
measuring points are used with passive detectors.
The following description only covers MST versions with 2 connectors (male + female)
for each CAN bus.
Only one CAN bus is described, the optional second CAN bus is connected the same
way.