Load Monitor
Load monitor is used for protecting main fuses of the property. The primary side current transformers must
be located near main fuses of the property. Optimum place would be immediately after power meter. Note
that primary side current transformers should have suitable conversion ratio. The load monitor uses
measured values of Jäspi current transformers (secondary side current transformers) and limits the power
of the boiler while one of the phases has overcurrent. Connect the Jäspi secondary side current
transformers to X:18 (common), X:19, X:20 and X:21.
Note! The minimum area of Jäspi current transformer cables must be 1.5 mm² up to 500 m.
Recommendation is to use shielded cable.
Note! With main fuses (of the property) smaller than 3 x 70 A, the Jäspi current transformers may be used
directly for load monitor.
On the left side of the figure above is connection of relatively small main fuses (< 70 A), when Jäspi current
transformers (TF1-3) can be used directly (depends on the size of the supply cable). On the right side of the
figure is shown the connection when primary side current transformers (TF4-6) are needed and Jäspi
current transformers (TF1-3) are used as secondary side current transformers.
The load monitor property must be enabled and configured accordingly in the software. More information
can be found from Menu 2.2 Current.
Summary of Contents for FIL-SPL
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