Concept
MP-C Built-in Power Supply
The MP-C has a built-in power supply designed to accommodate 24 VAC at 50/60 Hz or 24 to 30 VDC input power.
The built-in power supply is based on a half-wave rectified, non-isolated design, which is complemented with electronic protection components for transient protection, overload protection, and EMC compliance.
To power the controller, you can use a transformer or a DC power supply:
Class 2 (EN 60742) transformer supplying a nominal 24 VAC at 50/60 Hz
DC power supply supplying a nominal 24 to 30 VDC with the required output power
For more information, see MP-C Controllers .
A separate, local 24 VAC step-down transformer is recommended to power each BACnet/IP device. The transformer with appropriate VA rating may also be used to power the locally connected I/O devices. The separate transformer helps to avoid problems with ground loops, 24 VAC induced EMI on LAN, low or distorted AC voltage level at the controller, and excess transformer load due to the half-wave power supply, which can result in intermittent equipment detected faults, loss of communications, or equipment damage.
Hardware Overview
MP-C Controllers