Saving Data In Case Of Power Outage; Stabilized Device Supply And Ups (Power Handle); Isolation And Grounding Concept; Isolation - IMC CRONOSflex Getting Started

1.2.4 Saving data in case of power outage

In case of an outage or interruption of the system's DC power supply, an
internal buffer battery in the base unit ensures that any running
measurement is ended in a controlled manner, that all measured data are
safely transferred to the internal data storage and that the associated files
are correctly closed. This procedure can take up to several seconds.
Subsequently, the system shuts down automatically.
The standard-equipped system's internal supply buffering extends to the
base unit, not the imc CRONOSflex Modules which are either directly
stacked or connected by cable, and is provided for the purpose of
preserving the data integrity under any conceivable operating
circumstances.
Additional buffering for the entire system, including the imc CRONOSflex Modules, so as to ensure
uninterrupted measurement operation even during phases of power failure, is also possible in
conjunction with the optional UPS supply module which comes with the carrying handle. This makes
mobile battery operation possible, or even bridge over power during vehicle starting processes. With
UPS operation of this type, it is possible to set a so-called "buffer time": this time period specifies after
how long a continuing power outage is no longer to be backed up, and thus when closure of the
measurement and automatic deactivation are to be initiated.

1.2.5 Stabilized device supply and UPS (Power Handle)

Comprehensive systems with correspondingly high performance
requirements can, in conjunction with low supply voltage and thus a high
resulting current (e.g. 12 V in a vehicle), exceed the amperage capacity of
the module terminal connections (max. 3.1 A). For this reason the
possibility is provided to equip the left carrying handle with an optional
supply unit, which generates a constant high system supply voltage of
50 V at max. 100 W from the 10 V to 50 V wide range supply voltage.
This not only makes it possible to reliably supply very large systems, but also to use the measurement
modules' PoE capabilities across the entire wide voltage supply range: according to PoE specs, for PoE
functionality a minimum supply voltage of 42 V on the network line is required. This is provided by the
supply unit in the handle for the entire 10 V to 50 V range.
The optional handle
operation even during a power outage. UPS units are available with a choice of either lead or Li-ion
batteries.

1.3 Isolation and grounding concept

1.3.1 Isolation

The imc CRONOSflex Modules' supply inputs are each isolated from the frame (CHASSIS) and
measurement electronics. This ensures in particular that in spatially distributed systems, where no
common CHASSIS or ground voltage for all subsystems can be assumed, neither uncontrolled ground
loops nor compensation currents occur. Neither the base unit's supply input, nor the voltage it supplies
to the measurement modules, is isolated. In a distributed system, therefore, the base-system's housing
(CHASSIS), and the directly connected amplifiers, as well as their supply voltage level are to be seen as
the central reference voltage (neutral point), to which the distributed satellites and their respective
can additionally be equipped with a UPS function to ensure the device's
20
imc CRONOSflex Getting Started Version 1.8 - 08.01.2014
Reference
Device supply
CRFX-400 with
CAN-Bus Interface
Power Handle
13