Datasheet

Product Data Sheet 4118 N/2H7P
02/01/2019 page 8 of 16
Locked rotor protection Auto restart
Locked rotor current at U
N
I
block
approx. 1.800 mA
Clock signal at locked rotor t
3
/ t
4
typical: 1,8 s / 5,2 s
After 5 failed start-ups there is an extended timeout of 30 seconds.
When several fans are operated together (in a fan tray) and one fan starts after the other and the starting current is
eventually limited, it can happen that the not yet operated fan is driven in reverse by the counter pressure. This
backspinning can lead to a failure of the first start-up. The fan detects this and tries another start with increased
torque.
Shutdown: Undervoltage: Uoff: < 28 V; Uon: > 30 V
Overvoltage: Uoff: >76 V; Uon: < 74 V
Startup current @ 48V; 0 - 9500 rpm