MSC-10
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5.
Electrical Grounding.
The shields of all cables should be connected
the MSC-10 power ground only, except for the cable connected to a PC
interface (PCI-20 or RCM-40) where the shield should be connected as
instructed in the PCI-20 or RCM-40 document.
6.
Safety Control Backup.
The use of a safety control backup is
strongly recommended to ensure a safe environment. The use of an alarm,
warning device or other backup devices which can detect equipment failure,
blown fuses and/or tripped breakers would help prevent harm or damage to
the content of the building. The safety control backup wiring (see Figure 2-1)
and the following guidelines are given for a safety control backup:
a)
Backup Power Source.
A backup relay (DPDT) connects to the
power source 1 in normal operation but will switch to the power
source 2 if the source 1 is disabled. The backup relay should be
selected to ensure it is capable of supporting the power load
required.
b)
Backup Thermostat.
It is also strongly recommended
to put a thermostat to at least one fan in parallel to the MSC
module output. If the Multistage Computer fails,
the backup thermostat will activate the dedicated fan at
full speed when the temperature will reach the set point
of the thermostat. The thermostat should be accessible
for its adjustment and should be set at 3 to 5 degrees
above the fan relative set point.
7.
Terminal Block Connections.
The MSC-10 terminal block is
equipped with numbered connections for ten control modules. Each module
must be connected (wired) to its proper terminals. Refer to the configuration
documents and wiring diagrams supplied for your equipment.
NOTE
Each multistage computer is shipped with a configuration
document and its wiring diagrams to show the connection
points of each control module and sensor. The correct
sequence of the various stages require the modules to be
connected in their proper order.
Chapter 2 - Installation
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