Vaisala Optimus OPT100 - Grounding DGA Monitor; Figure 15 Inside Power Supply Unit Cabinet (OPTPSU1 and OPTPSU2)

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Figure 15 Inside Power Supply Unit cabinet
(OPTPSU1 and OPTPSU2)
1 Circuit breaker for AC or DC power
(F1)
2 Surge arresters
3 Power switch (S1)
4 Power supply
5 Relays (3 pcs). Each relay has a LED
that is lit when the relay is active.
6 DC OK LED. If flashing, check DC
output wiring.
7 DC out terminal block (X5)
8 Relay control terminal block (X4)
9 Relay output terminal block (X3)
10 Mains power in terminal block (X1)
4.4 Grounding DGA monitor
• Grounding cable with 4 … 16‑mm
2
(12 … 5 AWG) conductor. Enough to reach
from the DGA monitor and the power supply unit to the grounding point(s).
• Cable stripping tool
• Crosshead screwdriver
• Metal file
• Multimeter
1. Locate the ground terminals on the underside of the DGA monitor and the power supply
unit, and find a good grounding point on the transformer or the surrounding structures.
2. Clean the grounding point of rust for a good connection.
OPT100 Installation Guide M211857EN-R
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