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3.3.3
Monitoring the device functions
The control circuits are constructed in such a way that even if a particular fault will almost
certainly occur, it cannot cause the power supply at the output of the automatic changeover
and monitoring module to fail. Examples: Failure of the control voltage, operation of a pro-
tective device, a short-circuit to exposed-conductive part or an earth fault, and an open cir-
cuit.
In addition to this, the module continuously monitors:
The control circuit that is required for the next changeover process (coil, control contacts, con-
nections)
Important connecting wires, such as
– the insulation monitoring mains/PE
– measuring current transformer
– temperature sensor
For alarm indicator and test combinations, and alarm indicator and operator panels, device fail-
ure monitoring can also be programmed via the BMS bus.
Thanks to the redundant hardware design of the changeover module, it is guaranteed to
function safely even if the microcontroller should fail.
3.3.4
Power supply
SUE487 provides the power supply for the PRC487 control device and the AN450 power sup-
ply unit, as well as the control voltage for the contactors from line 2, (or from line 1 if line
2 fails). The 107TD47 insulation monitoring device is supplied by the IT system.
The AN450 power supply unit supplies power to a maximum of 3 MK2418 or 2 MK2430
alarm indicator and test combinations.
3.4 System components
In chapter "9. Manufacturer's certificate, checklist, circuit documentation" of this operating
manual, you will find instruction leaflets containing detailed information about the following
system components:
PRC487
SUE487, SUD487
A-ISOMETER®107TD47
BMS bus
AN450
STW2
12
All manuals and user guides at all-guides.com
Control device for changeover modules
Voltage relay
Insulation monitoring device with transformer
monitoring
Bender Measuring Device Interface
Power supply unit
Measuring current transformer
System description
TGH1322en/06.2009
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