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KLIBO-Power-Brake-Plus
The controller-operated high performance brake for three-phase motors
Special features:
- Phase sequence and no-voltage monitoring
- 2 LEDs for status indication
- Restarting during braking
- Relay outputs control release and braking contactor
- Controller-operated and self-monitoring
- Separately adjustable braking currents for star and delta
- Automatic detection of star and delta braking
- Temperature of power semiconductors is monitored
- Braking current control for consistent braking torque
- Safety monitoring for use with rotary switch
Technical data:
- Designation
- 870 900 41 = 230 V~
870 900 51 = 400 V~ - Nominal voltage ranges
- 110 V~, 230 V~, 400 V~
- Nominal frequency
- 50-60 Hz
- Voltage range
- 85-110%
- Braking voltage
- 5-540 V (limited to approx. 430 V)
- Max. braking current
- 40 Aeff
- Semiconductor protection
- Electronic current limitation, temperature monitoring
- Max. braking time
- 10 sec.
- Max. braking energy
- 128 kJ (on 4 Ohm coil, star connection)
- Power input of control electronics
- 4 W
- Ambient temperature
- -5° 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. 400 ms
- Mode of operation
- Controller operated with watch-dog
- Dimensions
- 170 x 98 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 400V - control voltage 230 V with isolating transformer [pdf-File]
Circuit diagram 3 phase 400V - control voltage 400 V [pdf-File]
Terminal designation [pdf-File]
Functional description:
The KLIBO-Power-Brake-Plus has been designed to generate extremely high braking torques for cage motors, while keeping the noise level as low as possible. Immediately after the machine is switched on and every time before the start of the motor , the system checks the direction of the rotational field. This includes a no voltage check and a temperature check of the power semiconductors. Two LEDs provide operational status information on the brake.
If all prerequisites are met, a voltageless relay releases and enables the machine to start. This protects the entire appliance, in particular in construction site environments where phase reversals in the supply line frequently occur. The integrated power electronics (three-phase bridge connection - six-pulse) 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 three-phase bridge connection allows for a symmetrical utilization of the supply. It is important to note that the line current of L1, L2 and L3 amounts to only 58%of the motor braking current, e.g. 23 A supply current generate 40 A braking current.
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 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 a heavy rotating mass (e. g. band-saws) quickly, silently, and safely. 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 stand-still, even if the temperature of the power circuit exceeds its limit.
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.