Power Automation Sweden AB

Cylindervägen 8
13152 Nacka Strand
Sweden
BA 9065

Underload monitor (Cos-phi monitor)

BA 9065

Contacts

Nominal voltage

Current range

Response delay

Variant

  • 0039727
  • BA9065.20 3AC380-440V 0,5-10A
The underload monitor BA 9065 measures the phase shift between voltage and current. The phase... more

Product description

The underload monitor BA 9065 measures the phase shift between voltage and current. The phase angle changes with changing load. This measuring method is suitable to monitor asynchronous motors on underload and no load independent of motor size. The change of cos ϕ has to be bigger then the hysteresis of the monitor. In some cases the cos ϕ does not change much with load change on the motor.

Monitors underload and no load on squirrel cage motors e.g.

- fan monitoring (broken belt)
- filter monitoring (blocked filter)
- pump monitoring (blocked valve, dry running)

Technical specifications

Enclosure design: Switch cabinet
Width: 45 mm
Operate delay: +
1- / 3-phase: 1, 3
Output contacts: 1 Schließer, 1 Wechsler
Measuring range max.: 10 A
Auxiliary voltage required: +
Type: BA 9065

Features

  • According to IEC/EN 60 255, VDE 0435
  • Detection of underload (cos ϕ)
  • Current ranges up to 10 A, for higher values a CT must be used
  • Adjustable response value
  • Programmable functions:
    - alarm when I = 0
    - automatic or manual reset
    - closed or open circuit operation
  • Manual remote reset
  • Adjustable operate delay
  • Independent of phase sequence
  • Also for 400 Hz systems
  • Optionally for motors with frequency converters (10 ... 100 Hz)
  • Width 45 mm