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Automatic mode: Upon first power-on, the equipment will be in negative pole grounding
mode. After transfer from operating mode to standby mode, in the morning of the second
day, when DC voltage exceeds insulation monitoring starting voltage, the equipment will
exit negative pole grounding mode and enter insulation monitoring mode. If abnormal
resistance is monitored, the equipment will report “insulation resistance” fault, and
monitoring of resistance will continue till it becomes normal. If monitored resistance is
normal, the equipment will exit insulation monitoring mode and negative pole grounding
mode will be restored.
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Manual mode: Without shutdown conditions of the equipment, on the touch screen
parameters setup interface, enable “manual insulation monitoring”. If current DC voltage
exceeds insulation monitoring starting voltage, the equipment will exit negative pole
grounding mode and enter insulation monitoring mode. If abnormal resistance is
monitored, the equipment will report “insulation resistance” fault. If monitored resistance
is normal, the equipment will exit insulation monitoring mode and enter negative pole
grounding mode again. Upon pressing of shutdown key during manual monitoring, if
current resistance is normal, the equipment will exit insulation monitoring mode and
enter negative pole grounding mode again.
10.11.2 Simple Troubleshooting
Regardless of the MV Station setting, when the insulation resistance is below the threshold
(settable from the LCD display), MV Station will send alarm signal and the Operation LED
will turn to yellow. After receiving the “low insulation resistance” alarm signal, user should
stop the device and check the specific insulation resistance from the LCD screen
“Function”–>”Run-information”->”Real time data”.
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If the insulation resistance recovers to normal, the fault loop is in the AC side.
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If the insulation resistance is still low, the fault loop is in the DC side.
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Whether the fault is on the DC side or AC side, switch off the system and perform a
thorough checking and troubleshooting.
10.12 Emergency Stop Button functions
The emergency stop button is located inside the monitoring window.
In emergency situation, open the monitoring window, press down the emergency stop
button to stop all the inverters inside the MV Station immediately.
10.13 Tripping Functions of the DC Main Switches
There are two selections (Enable/Disable) for the parameter “Trip” in the running parameter
of the LCD touch screen. If the “Enable” options is chosen, all DC main switches of MV
Station will trip immediately. If required, observed the following steps.
step 1 Tap “Function” from the default menu.
step 2 Tap “Set-parameter”.
System Manual
