499247 AJR OIPM

499247
12 | AJR Jet Fan
8.5 Frequency converter (if used)
• Only operate the fan outside these speed ranges.
• Pass through these speed ranges so quickly that any vibration cannot exceed the admissible resonant frequency values.
• For variable-speed fans, use a permanent vibration monitor for long-term safe operation.
• Observe the operating instructions of the frequency converter.
Commissioning of the frequency converter:
• Install the fan and frequency converter as near as possible to one another.
• Use shielded cables.
• All components (fan, frequency converter and motor) must be grounded.
• We recommend using all-pole sinus filters.
• Provide thermal protection in the form of a PTC resistor or thermal contacts (TC) in the motor.
• Never exceed the maximum impeller rotation speed indicated on the name plate of the fan.
Operation of the frequency converter:
• Avoid running the fan via the frequency converter below 10 Hz.
• If controlling the fans via a frequency converter, provide thermal protection in the form of a PTC resistor or thermal contacts (TC) in
the motor.
• Starting time: min. 60 sec.
8.6 Residual current circuit breaker
• All-current-sensitive residual current circuit breakers are required for use in alternating-current systems with 50/60 Hz, in
combination with electronic devices such as EC motors, frequency converters or uninterruptible power supplies (UPS).
Warning
Risk from resonant frequencies when using frequency converters