oH1 on DELTA inverters: IGBT overheat

DELTA inverters: MS300

Disconnect the supply and wait for the capacitors to discharge before opening the inverter or touching its terminals.

Common causes

1. 1High panel temperature
2. 2Fan stopped or heatsink clogged
3. 3High carrier frequency with a heavy load
4. 4Not enough clearance

Try first

1. 1Clean the heatsink and fan and check the fan turns
2. 2Ventilate the panel and leave clearance
3. 3Lower the carrier frequency (Pr.00-17)
4. 4If the load stays high, choose a larger drive