SOLAR controls WATTrouter Mx series User Manual page 34

WATTrouter Mx - user manual
even in the case of standard wiring without external measuring transformers). External current
transformers can extend the measuring range of the controller up to any value, depending on the
conversion rate of the external current transformer.
Example: Let us say you want to use WATTrouter Mx in a facility where the main circuit breaker is
rated up to 3x400A. In this case you have to buy external current transformers with ratio 400A:5A.
Connect/short-cut their secondary terminals using a wire, and at the same time, pass it through
measuring coils of the current sensing module (see Figure 7). Now set the conversion rate to 400:5.
However, in order to use the full range of the built-in A/D converter, it is recommended to make 4
turns around the measuring coils to get optimum conversion rate of 400A:20A. Then, set the
conversion rate to 400:20.
Caution: Use only external CTs for large facilities and large PV-plant power outputs. If you are using a
high conversion rate of external CTs, you have to take into account that (relatively) small power
outputs (in the example describing the optimized conversion rate 400A:20A, the limit represents
approximately 100 W per phase) are below the resolution capacity of the measuring inputs and
therefore, these power values will not be measured and equal to zero.
ANDI input settings:

Measurement source – use this to setup the energy measurement source for the ANDI input.
Following options are available:
a. Unknown – input counts e.g. energy flowing to a load or another appliance.
b. Prod. L1 – input counts energy measured on L1, value will be added to daily production stats
on L1.
c. Prod. L2 – input counts energy measured on L2, value will be added to daily production stats
on L2.
d. Prod. L3 – input counts energy measured on L3, value will be added to daily production stats
on L3.
e. Prod. L1+L2 – input counts energy measured on L1+L2, value will be equally divided to daily
production stats on L1 and L2.
f. Prod. L2+L3 – input counts energy measured on L2+L3, value will be equally divided to daily
production stats on L2 and L3.
g. Prod. L1+L3 – input counts energy measured on L1+L3, value will be equally divided to daily
production stats on L1 and L3.
h. Prod. L1+L2+L3 – input counts energy measured on all phases , value will be equally divided
to daily production stats on L1, L2 and L3 (i.e. counted value will be divided by 3).
i. SSR1 to Relay1 – input measures the power of the appliance connected to respective output.
j. WLS1 to WLS6 – input measures the power of the appliance connected to respective wireless
station. The option is displayed only if the SC-Gateway module is inserted into the regulator.
The measuring element (external current transformer or external impulse output meter)
must be physically connected to the ANDI input and therefore this measurement cannot be
easily done wirelessly.
Note: If you measure PV production on several phases with an external three-phase electricity meter, whose S0
output is connected to one ANDI input, and the inverter does not always distribute the production evenly to all
phases, you must neglect the differences. If you want to be precise, you have to use 3 ANDI inputs and 3
How to fit and setup the device Page 34 from 82