2. If you have replaced any electrical components or wiring, verify that:
• All components that are secured to a DIN rail are firmly in place.
• There are no disconnected cables or loose wires.
• All grounding wires are attached.
• Wiring is done according to the wiring instructions in the OPT100 Installation Guide
(M211857EN), unless intentionally altered by the repair procedure.
3. If you have replaced any of the oil handling components (pipes, valves, pump, oil block,
etc.) or opened any of the oil connections, verify that:
• There are no open oil connections.
• All oil handling components are securely attached.
• All oil leaks have been cleaned and wiped clean. No oil is visible on the parts or oil
connections.
4.6.4 Turning on DGA monitor after maintenance
If the circuit breakers will not stay in the ON position, turn o Mains
power to the DGA monitor immediately and inspect the Mains and OPTPSU
power wiring. The circuit breakers may be tripping because of a loose wire or
incorrect connection.
CAUTION!
1. Verify that the circuit breakers Main and Heat inside the DGA monitor are turned on.
2. Turn on power inside the power supply unit:
a. Open the power supply unit cabinet.
b. Turn on circuit breaker F1.
c. Turn on switch S1.
3. Turn on OPTPSU power to the DGA monitor:
a. Check if there are any warning labels attached to the disconnection device. If there
are, make sure it is safe to turn on the OPTPSU power. Remove any labels that are
now unnecessary.
b. If the external disconnection device is locked in the o position, unlock it.
c. Turn on OPTPSU power from the external disconnection device.
4.6.5 Starting measurement
In normal operation DGA monitor repeats the measurement cycle continuously. You can only
start the measurement if DGA monitor is currently in standby.
1. Connect to the DGA monitor user interface and log in as an Admin user.
2. Start measurement from Control > Start Measuring.
Chapter 4 – Maintenance
75
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