4.4.1
Connection of frequency converter/MPR relay
This example shows which inputs/outputs on the EBC20 need to be connected to the frequency converter/MPR relay.
• Connect the supply voltage to terminals 1–3
• Loop terminals 12 & 20
• Connection to the boiler:
Connect the burner start signal to terminals 13 & 14
Connect the potential free contact to terminals 11 & 19
• Frequency converter:
Connect terminals 7 & 8 to the start/stop input on the frequency converter
Connect terminals 21 & 22 to the frequency converter input for external speed regulation
Terminals 26 & 28 can be connected to the frequency converter alarm output
• Connect the pressure transducer (XTP) to terminals 23–25 using a a shielded
cable 3x0,75 mm
2
and connect the cable shielding to the cable bracket
3002878-EBC20-UK
32
• Pressure-controlled regulation