MSA SUPREMA Touch, Инструкция по установке и обслуживанию, Страница: 90 / 309

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MSA
Maintenance and Service
SUPREMATouch 89
US
6.4 Replacement of Modules
When a module is found to be defective, it must be replaced.
NOTE: An MSA service technician must be called in to help with the diagnosis and to help decide
whether the module has to be replaced.
NOTE: Generally, all plug-in modules must only be replaced after the voltage to the
SUPREMATouch system has been shut off. Also pull out and plug in the plug-in modules only af-
ter having disconnected the supply voltage connections.
In the following, the procedure for replacing individual modules is described.
Plug-In Modules
Replacement of the MCP and MDO Modules
The MCP module and the MDO module are responsible for signal processing, signal manage-
ment, and the storage of configuration data, among other things, in the system. The voltage to the
system must therefore be shut off before these modules can be replaced.
The modules must be replaced as follows:
-
Safeguard the system configuration [setup/measure points, relay outputs, system].
-
Cut off the power to the system [e.g., by disconnecting the supply voltage connections at the
MIB module].
NOTE: When rail-mounted relay modules are being used, the triggering of an alarm associated
with the shut-off of the voltage can be prevented by locking the relays on the MRC TS module,
provided that the MRC TS module is supplied with a voltage separate from that of the system
[Chapter 10.7]
-
Replace the MCP20, or MDC20 and MDO20 modules [be careful with the ribbon cable con-
nection between the MDC20 and the MDO20 modules].
-
Turn the voltage supply back on.
-
Reconfigure the system.
-
Unlock the relays again if necessary.
Replacement of the MDA Module
It is necessary to turn off the system to replace the MDA module. To prevent alarms and failure
messages, the measure points assigned to the MDA module or the relays assigned to the meas-
ure points must be inhibited.
Replacement of MAI, MCI, and MPI Modules
It is necessary to turn off the system to replace the MAI module. To avoid alarms and failure mes-
sages, the measure points assigned to the MAI module or the relays assigned to the measure
points [Chapter 10.7] must be inhibited.
If the MPI or MCI module is also to be replaced along with the MAI module, be careful to ensure
that the correct assignment to the connected sensors is preserved [Chapter 10.7].
When MPI modules are being replaced, the following points must be kept in mind: