40 Program features
DC input specific current monitoring (available with G417
option)
With the G417 option each DC input current is measured. This information is used for
detecting DC input overcurrent, reverse DC input current, current deviations between DC
inputs, and for detecting blown DC input fuses. DC inputs used in monitoring are
configured using parameters 174.01 and 174.02 for M1 and M2 connected DC inputs. DC
input currents can be monitored from 174.31...174.62 for M1 and M2 DC input 1…12
current.
Note: Currently, only power modules M1 and M2 are used.
Settings
174.01 M1 connected DC inputs
174.02 M2 connected DC inputs
174.31 M1 DC input 1 current...174.62 M2 DC input 12 current
Overcurrent detection
The Overcurrent detection function can be enabled through parameter 174.05 Overcurrent
detection. Detection can trigger either a delayed fault or an instantaneous fault depending
on the current level and delay. The instant overcurrent trip limit is set to 174.06
Overcurrent instant limit. A smaller current limit with a delay can be inserted to 174.07
Overcurrent delayed limit and time limit to 174.08 Overcurrent time delay.
Settings
174.05 Overcurrent detection
174.06 Overcurrent instant limit
174.07 Overcurrent delayed limit
174.08 Overcurrent time delay
Reverse current detection
The Reverse input current detection function can be enabled with parameter 174.09
Reverse current detection. If reverse current is detected, a fault is activated after the delay.
The limit value is set to 174.10 Delayed Reverse current limit and the delay to 174.11
Reverse current time delay.
Settings
174.09 Reverse current detection
174.10 Delayed Reverse current limit
174.11 Reverse current time delay
Current deviation detection
A faulty DC input, e.g., due to a high amount of shadowing or obstacles can be detected if
the current in one DC input deviates significantly from other DC inputs. The current
deviation function is enabled by default and the action is Warning. The action can be
changed with parameter 174.14 Current deviation action. If the DC input currents deviate
more than the current configuration limits, then the 174.14 Current deviation action is
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