Program features 41
activated after a delay defined in parameter 174.15 Current deviation delay. The
configuration limits contain additional parameters. See the following description.
The inverter can be configured to use either a relative or absolute comparison between DC
input currents by setting parameter 174.16 Comparison mode to the desired manner. The
value that the individual currents are compared against is the reference value depending
on which type is selected by parameter 174.17 Reference type. The reference value can
be selected to be either the maximum or the mean value of the connected DC inputs.
Global reference – selects the method for calculating reference current: from the input
section specific currents or from all inputs currents (global).
• If all inputs have equal number of panels and are installed in a similar way, global
reference can be used.
• If there are installation differences between the inputs, local reference should be used
because the input currents are comparable only inside the input section.
Relative comparison mode – individual DC input currents are compared against the
reference value in percent. The limit is defined by parameter 174.19 Relative current limit.
If a DC input current is more or less than the reference value an action is triggered after
the delay. Additionally, the reference value must be more than what is defined in
parameter 174.21 Relative threshold to avoid nuisance trips at low currents.
Absolute mode – individual DC input currents are compared against the reference value
in amperes. If the difference is greater than the value found in parameter 174.20 Absolute
current limit in amperes an action is triggered after the delay.
Settings
174.15 Current deviation action
174.16 Comparison mode
174.17 Reference type
174.18 Global reference
174.19 Relative current limit
174.20 Absolute current limit
174.21 Relative threshold
Blown fuse detection
The Fuse monitor action can be enabled through parameter 174.22 Fuse monitor action.
The default action is Warning.
A blown fuse can be detected if the DC input current is less than the value found in
parameter 174.23 Blown fuse detection limit and the mean DC input current is over 174.24
Blown fuse active boundary.
Note: It is also possible to check the DC fuse status with option G420: DC input
fuse blown indicator (one common output signal per power section, not with
0F291).
Settings
174.22 Fuse monitor action
174.23 Blown fuse detection limit
174.24 Blown fuse active boundary
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