Connecting mains power - OPT100

OPT100 Installation Guide
Document code
M211857EN
Revision
V
Language
English
Product
OPT100
Document type
User guide
  • Mains power cable with 2.5‑mm2 (14 AWG) conductor and 9–16‑mm (0.35–0.63 in) external diameter. Must be compliant with local regulations for mains power cables.
  • Cable stripping tool
  • Screwdriver with 3-mm-wide (0.12‑in) slotted head
  • Adjustable wrench
WARNING Only licensed experts may install electrical components. They must adhere to local and state legislation and regulations.
WARNING Make sure that you prepare and connect only de-energized wires.
WARNING Keep away from live circuits. Operating personnel must observe safety regulations at all times.
WARNING

If the diameter of your mains power cable is not compatible with the cable gland marked AC in or DC in, you can use either of the two cable glands marked Spare (diameter 5–10 mm (0.2–0.39 in)). If you are not wiring any relay outputs, you can also use cable gland marked Relay out (diameter 7–12 mm (0.28–0.47 in)). If the AC in or DC in cable gland is left unused, remember to plug it so that the cabinet remains tight.

If the power supply unit has no suitable cable gland free, you can replace the cable gland marked AC in or DC in with a certified cable gland that is suitable for protecting the cable and providing strain relief.

  1. Install needed external disconnection and overcurrent protection devices (for example, circuit breakers) for the mains power connection. Note the following:
    • The external disconnection and overcurrent protection device for AC mains power (OPTPSU1) must be rated 16 A or 20 A at 250 V AC, and must conform to any additional local regulations.
    • The external disconnection and overcurrent protection device for DC mains power (OPTPSU2) must be rated 16 A at 250 V DC and conform to any additional local regulations.
      CAUTION External overcurrent protection device, such as a circuit breaker, must be installed to the supply side and it must be suitable for the applicable operating temperature range in order to comply with the EN 61010-1 electrical safety standard.
    • The disconnection device must be visible from the DGA monitor, or lockable with a key to prevent accidental switching on during installation and maintenance.
    • The DGA monitor should not block access to the disconnection device after it has been installed. The disconnection device should remain easy to operate.
  2. Clearly mark the disconnection device as the disconnection device for the OPT100 Optimus DGA Monitor.
  3. Make sure the external disconnection device is turned off. If possible, lock it in the off position.
  4. Run the AC or DC cable between the external disconnection device and the power supply unit of the DGA monitor.
  5. Connect the AC or DC cable to the external disconnection device.
  6. Open the cable gland marked AC in or DC in on the power supply unit. Remove the plug and store it for later use.
  7. Prepare the cable for connection to the power supply unit:
    1. Strip 14 cm (5.51 in) of the cable to expose the wires.
    2. Cut off 2 cm (0.79 in) of the line and neutral wires (brown and blue). Leave the green and yellow grounding wire 14 cm (5.51 in) long.
      CAUTION Make sure that the grounding wire is longer than the line and neutral wires. Under mechanical stress, the grounding wire must be the last to disconnect from the protective ground terminal.
    3. Strip the ends of the individual wires to expose the conductors for 1 cm (0.4 in).
  8. Insert the cable through the outer nut and the inner seal.
  9. Start inserting the cable through the cable gland, and stop when the unstripped cable is visible through the gland.
  10. Inside the power supply unit, connect the wires to terminal block X1:
    1. Connecting OPTPSU1 (AC):
      CAUTION Line and neutral must be connected to the correct terminals or surge protection of the DGA monitor will not function appropriately. If you are uncertain which wire is line and which is neutral, make sure by measuring their potential with respect to ground.
      Table 1. Terminal block X1 wiring
      Signal Wire color Terminal
      Line Brown L
      Neutral Blue N
      Ground Green/yellow
      Figure 1. Terminal block X1 wiring for OPTPSU1 (AC)
    2. Connecting OPTPSU2 (DC):
      CAUTION Positive and negative must be connected to the correct terminals or surge protection of the DGA monitor will not function appropriately. If you are uncertain which wire is positive and which is negative, make sure by measuring their potential with respect to ground.
      Table 2. Terminal block X1 wiring
      Signal Wire color Terminal
      Positive Brown +
      Negative Blue -
      Ground Green/yellow
      Figure 2. Terminal block X1 wiring for OPTPSU2 (DC)
  11. Tighten the AC in or DC in cable gland. The cable gland is also the strain relief for the cable, so make sure the gland holds the cable tight. See Figure 1 for recommended tightening torques.