Measurement Computing ZonicBook 618E rev.3.4 - Manual (Page 89)

Connecting the System to Power
CAUTION
An incorrect use of power can damage equipment or degrade performance. Prior to
connecting your devices to power, calculate your system’s power requirements.
If you assign one TR-40U per device your system’s power needs will be met and you
will not need to make power requirement calculations. However, such calculations are
required if you intend to “power daisy-chain” units, or have a critical battery runtime.
Each ZonicBook/618E and WBK18 Expansion Module is shipped with a TR-40U power adapter, which
converts AC power to +10 to +30 VDC power. The adapter’s DIN5 connector connects to the device’s
mating POWER IN DIN5. The other end of the adapter connects to a standard AC power outlet.
It is possible to create a power daisy-chain. In the daisy-chain scenario a WBK18 module’s POWER IN
connects to the previous WBK module’s POWER OUT; with exception of the first WBK18, which must
be connected to a 10 to 30 VDC power source. A WBK18’s POWER OUT connector can be connected to
the next module’s POWER IN, providing that a 5 amp current limit will not be exceeded. Note that TR-
40U’s have a 3.33 amp limit.
It may be necessary to use a supplemental power supply. For this reason, you need to know your system’s
power requirement. Computing power use is also important when using batteries to power modules, as you
will need to know a safe runtime before recharging is required.
The following statements relate to system power. They should be reviewed before
proceeding.
• Higher voltages draw fewer Amps for the same power.
Remember: Watts = voltage x current (W = V*I).
• The TR-40U power adapter provides power that is sufficient for the
ZonicBook/618E and the optional WBK18 modules, i.e, one TR-40U per unit.
You do not need to make power requirement calculations unless you intend
to “power daisy-chain” units, or you have a critical battery runtime. In other
words, if you assign one TR-40U per device your systems power needs will be
met.
• Do not overload your power supplies. TR-40U power adapters are limited to
3.33 amps. However, you can use a TR-40U for each unit in the system.
• Current drawn from other sources, such as car batteries, can be estimated from
the following Current Requirements table.
Use the following current requirements and worksheet tables to calculate your system’s total power
requirement. Take the appropriate amperage values from the first table to fill in the second table; then
perform the indicated multiplication and addition operations to calculate the amperage for all units in
your system.
ZonicBook/618E User’s Manual 929795 System Expansion 11-5