Signal and Power Supply Wiring. Vaisala MMT330

User's Guide _______________________________________________________________________

Signal and Power Supply Wiring

When connecting transmitter with 8-pin connector, see section 8-Pin

Connector on page 65. When wiring the power supply module, see

section Power Supply Module on page 48.

0506-028

Figure 18 Screw Terminal Block on Motherboard

The following numbers refer to Figure 18 above:

1 = Power supply terminals 10 ... 35 VDC, 24 VAC

2 = User port (RS-232 terminals)

3 = Analog signal terminals

WARNING Make sure that you connect only de-energized wires.

36 ___________________________________________________________________ M210733EN-H

Chapter 3 ________________________________________________________________ Installation

1. Open the transmitter cover by taking out the four cover screws.

2. Insert the power supply wires and signal wires through the cable bushing in the bottom of the transmitter; see the grounding instructions in the previous sections.

3. Connect the analog output cables to terminals: Ch1 +, Ch1-, Ch2+,

Ch2-. Connect the RS-232 user port cables to terminals RxD, GND and TxD. For more information about the RS-232 connection refer

to section Serial Line Communication on page 78.

4. When wiring the optional modules, see the corresponding section for instructions:

- RS-422/485 Interface on page 56

- Relays on page 55

- Third Analog Output on page 53

- LAN Interface on page 61

- WLAN Interface on page 62

5. Connect the power supply wires to the connectors: POWER

10...35V+ 24V~ (+) and (-) terminals. If you are using 24 VAC power supply, see the note below before connecting the supply wires.

6. Turn on the power. The indicator LED on the cover is lit continuously during normal operation.

7. Close the cover and replace the cover screws. The transmitter is ready for use.

VAISALA ________________________________________________________________________ 37