HV DTemp Measurement System – Mounting and Installation
User Guide
21
Version 01.00 // 2021
NOTE!
i
Depending on the number of modules and the cable lengths it may be
necessary to apply an intermediate power supply.
→ See paragraph "Cable lengths" for further information.
4 3 2 5 Connecting the power supply
Connecting an HV DTemp-P central unit and any further measurement modules linked to it
to the power supply is made via the interface cable, which also connects the measurement
module to the PC/data acquisition system. These cables are available in different lengths.
The modules are designed for low power consumption. In combination with CSM connection
cables and due to their compact design, these modules can in most cases be easily installed.
To ensure error-free functioning, the following aspects should be taken into account when
choosing the appropriate power supply.
Minimum supply voltage
The minimum power supply voltage is the minimum voltage delivered by a power supply. In
an automotive application, this is usually the vehicle's on-board supply system (e.g. "12 V"
for passenger cars). Note that this minimum value is required for proper operation of the
module. For example, with a 12 V on-board power supply system this value may drop below
the minimum value specified for a module for a short time (a few milliseconds) when star-
ting the engine.
When operating these modules, always ensure that the voltage applied to the last measure-
ment module in a power supply chain does not drop below the minimum value of 6 V.
Cable lengths
The resistance of a connection cable causes a voltage drop in the cable. The extent of the vol-
tage drop depends on the length of the cable and the current flowing through it. The voltage at
the last module in a supply chain must not drop below the specified voltage range (min. 6 V).
i
For typical applications CSM recommends the following installation:
Power supply ≥ 12 V, total cable length ≤ 10 m:
→ up to 8 measurement modules per power supply
Power supply ≥ 8 V, total cable length ≤ 10 m:
→ up to 5 measurement modules per power supply
NOTE!
i
If more modules are wired in series (given the same cable length and supply
voltage) than stated in, an additional power supply is needed.
An intermediate power supply is also required if, due to correspondingly
higher power consumption, of series modules require more current than
the existing power supply can provide.
i
For further technical information on the subject of daisy-chaining measu-
rement modules, please contact our sales department.
→
Further information on the cables available can be found in the "CAN Accessories" datasheet
