Installation
Operations Manual Thyro Power Manager
Page 20 of 52
Version 2008-03-11
An external electrical current converter (input 1) and an external voltage converter (input 2)
are needed for (single-phase) power and energy measurement. Input 3 may further be
deployed, additionally. Again, both converters must be configured in a manner so that a 1V~
measurement voltage is generated at a nominal electrical current and at a nominal voltage.
For this reason, the electrical current converter must be equipped with an adequate load
resistance, and possibly, an adequate series resistance must deployed together with the
voltage converter. The internal resistance of the measurement device is 7540 Ohms.
An AEG voltage converter (order no. 2 000 000 399) can be deployed as voltage
transformer. This device possesses a transformer ratio of 16:1, and can primarily be used up
to 690V. If this converter is deployed, the following series resistance values result:
Series Resistance
[Ohm]:
Mains
voltage [V]:
Secondary
voltage [V]:
Computed: Selected:
Note:
110
6,875
44298
44000 22k + 22k
230
14,375
100848
101000 100k + 1k
400
25
180961
181000 180k + 1k
500
31,25
228087
228200 220k + 8k2
690
43,125
317625
320000 220k + 100k
Table 3: Series Resistance Values for AEG Voltage Converter