User manual

62 of 148
3.7.3 AC Current
The GSC400 controller is designed to measure AC current from the generator
with the use of current transformers (CTs). The maximum current on the AC
current terminals of the GSC400 is limited to 5A.
The “Turns Ratio” sub menu is used to setup the CT ratio. All numbers in this
menu are in terms of 5A. For example selecting 1000 is the same as 1000:5A
(the GSC400 displays 1000A on the screen when the current measured on the
GSC400 AC Current terminals is 5A).
The AC Current menu is also used to set the over current warnings and
shutdowns. These are grouped in terms of the voltage group 1 to 4. The AC
current warning and failure depends on the voltage group selected in the Voltage
Group submenu of the AC Voltage menu.
The Hi Wye Current parameter (second to last entry in the AC Current menu) is
used to double the current reading (50% selection) if voltage group 3 is selected.
It has no effect on other voltage groups. If this is not desired then the 100%
selection should be selected. Some generators have two wires for each phase,
and as such, the current transformer (which is placed on only one wire) will see
only 50% of the current from each phase.
The Cur Warn Latch option (last entry in the AC Current menu) is used to latch
on a special configurable output (see Current Latch in Table 18 on page 69) that
turns on when the current exceeds the Current Warning Threshold and can only
be turned off by the user at the front panel. On a current latch condition the LCD
displays “Over Current Latched.” and “<Up Arrow> + <Down Arrow> for Unlatch”.
3.7.3.1 EPS Supplying Load Front Panel Lamp
If the GSC400 AC current rises above 5% of the AC over-current warning
setpoint, the EPS Supplying Load front panel LED is lit. Otherwise it remains
unlit.