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KLIBO-Power-Brake
The new powerful controller-operated brake for three-phase motors
Special features:
- Standstill detection
- Restarting during braking
- Relay outputs control release and braking contactor
- Braking current control
- Controller-operated with watch-dog
- Separately adjustable braking currents for star and delta
- Automatic detection of star and delta braking
- Temperature of power semiconductors is monitored
- Safety monitoring for use with rotary switch
Technical data:
- Designation
- 870 900 11 = 230 V~
870 900 21 = 400 V~ - Nominal voltage ranges
- 110 V~, 230 V~, 400 V~
- Nominal frequency
- 50-60 Hz
- Voltage range
- 85-110%
- Braking voltage
- 0-400 V
- Max. braking current
- 20 Aeff
- Semiconductor protection
- Electronic current limitation, temperature monitoring
- Max. braking time
- 10 sec.
- Max. braking energy
- 32kJ (on 4 Ohm coil, star connection)
- Control electronics power input
- 2 W
- Ambient temperature
- -10° C ... +50° C
- Storage temperature
- -40° C ... +80° C
- Braking frequency
- 10% of running time at 10 sec. braking time (36/h)
- Reclosing delay
- Approx. 400ms
- Mode of operation
- Controller operated with watch-dog
- Dimensions
- 144 x 74 x 33 mm (WxHxD)
- Max.
conductor size - 2.5 mm²
Relay outputs:
- Nominal voltage:
- 400 V AC
- Continuous current:
- Relay 1: 3 A
Relay 2: 12 A
Circuit diagram 3 phase 400 V - control voltage 230 V with isolating transformer [pdf-File]
Circuit diagram 3 phase 400 V - control voltage 400 V [pdf-File]
Terminal designation: [pdf-File]
Functional description:
The KLIBO-Power-Brake has been designed for powerful and low-noise braking of cage motors. The integrated power electronics (controlled bridge rectifier) generates a direct current which induces a standing magnetic field in the motor coil and brakes the rotor. A powerful state-of-the-art industrial micro-controller monitors and to a large extent compensates for factors that impact the braking performance over time (e.g. heat induced increase of the supply line and motor coil resistance, fluctuations of supply line voltage). Fluctuations of the braking time are minimized.
The bridge connection allows for an even loading of the supply line and prevents high pulse currents. That means that a braking current peak of 28 A (= 20 Aeff) generates the same load in the supply line. The motor efficiency when braking differs for star and delta connections. For that reason both braking applications can be adjusted independently. The braking currents for star and delta connections can be adjusted continuously and independently by means of two potentiometers. This improves safety, in particular in emergency stop situations.
This connection allows for significantly higher voltages than other commercially available brakes, making it possible to brake high-resistance motors with heavy rotating mass (e. g. band-saws) quickly, silently, and safely. The integrated standstill detection notices when the motor stops and then inactivates the brake. Machines can be safely restarted during braking. Additionally, the “safety input” feature provides a low-cost solution for mannual star-delta connections. The switch is monitored continuously. When it is actuated, the braking current is switched off immediately. This prevents contact welding due to the high DC current.
The electronics is self-monitoring and has sufficient safety reserves to brake the motor safely to standstill, even when the temperature of the power circuit exceeds its limit. After the power circuit has cooled down, the motor may be started again. For applications that require more braking energy, see KLIBO-Power-Brake-Plus.
Motor heating during braking:
When braking a motor by feeding a direct current, the same amount of heat is generated as during start-up. For motors that are frequently started and braked by high currents, the additional use of a thermistor (thermal sensor) to monitor the motor temperature is recommended.