TDK-Lambda QM Series, Application Notes, Page: 5 / 48

QM range App Note, document number 260283, rev 15 Page 5 of 48
1. INPUT
AC Input Line Requirements
Please see the datasheet for the specification of input line requirements (including Input voltage range, input
frequency, input harmonics, input current and leakage current).
The power supply will automatically recover from AC power loss and start-up with maximum loading at 90VAC.
Repetitive ON/OFF cycling of the AC input voltage will not damage the power supply or cause the input fuse to
blow.

Input Fuses
One ('E' input fuse option) or two ('D' input fuse option) internal fuses are fitted. The fuses are not user
serviceable and are fast acting rated 25A / 250Vac HBC types.

Input Undervoltage
The power supply is protected against the application of an input voltage below the minimum specified so that it
shall not cause damage to the power supply.
AC Input Connections

QM with factory fitted fan
– F or R type cooling
To access the AC terminal block remove terminal block
cover by pressing both tabs and pulling forward.
Perform the reverse operation to re-fit.

QM with customer supplied airflow
– C type cooling
No fan or terminal block cover is fitted with the customer
supplied air option