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Add-on brake ASB20
with standstill detection and controlled braking current
Description
Features
- For braking three-phase and single-phase motors
- DC brake with regulated braking current up to 20A (ASB20), optionally up to 30A (ASB20/30)
- Automatic braking current limitation
- Delayed engagement of the braking current
- Disconnection of the motor after standstill detection
- Self-regulating adjustment of braking duration through standstill detection
- Reproducible setting of braking current
- Automatic adaptation to motor resistance
- Minimal thermal load on the motor
- Thermal overload protection for ASB20/30
- Error detection with automatic shutdown
- Connection via spring-loaded terminals
- LED display for operating status
- For DIN rail mounting
Clearance sale - Model will be replaced by ASB20/S
Series Specifications
Voltage
Depending on the version 110V, 230V, 400V (+10...-15%)
Frequency
50/60Hz, limited generator operation
braking current
Adjustable, controlled, depending on the version 1...30A
Motor power
Depending on the model 0.18...11 kW
Performance Level
PL = b according to DIN EN ISO 13849-1
PFH
4.23x10^-6h^-1
MTTFd
259 years
Test No.
IFA1203002
standstill detection
Measurement via the third motor connection
Error detection downtime
3 times braking time longer than 10s ... 13.9s 1 time braking time longer than 14s special versions with fixed braking time special versions up to 20s
Operational display
Two LEDs
braking time
Automatic adjustment with standstill detection 0.8 ... 10s
Delay before restart
Approximately 300ms
Max. switching frequency
10% ED at 10 seconds braking time (60/h)
power loss
Pv=400mW (in idle state) Pv<=17W (during braking, depending on the braking current and internal resistance of the motor)
Power semiconductor monitoring
Overtemperature shutdown (optional)
Pre-insurance - Final page
16A gL ASB20/30: 25A gL
Pre-insurance - Tax side
F10A
Connections - Load
Wago spring clamp terminals
stripping length
8-9mm
Cross section
0.08 - 4.0 mm² solid 28-12 AWG 0.25 - 2.5 mm² fine-stranded with AHS
Connections - Control circuit
Wago spring terminals
Cross-section
0.08 - 2.5mm² solid wire 28-12 AWG 0.25 - 1.5mm² fine wire with AEH
Housing material
PA6.6-GF10-V0
Ambient temperature
-10°C ... +45°C
Storage temperature
-25°C ... +75°C
Weight
345g
Dimensions
43x106x103mm (W x L x H)
Function description, commissioning, installation, notes
Function Description
With the standstill detection, only the braking current needs to be set on the release brake. The brake's current regulator compensates for any thermal changes in the motor resistance, ensuring that the same braking duration is consistently achieved. Production variations in the motor winding are also balanced out.
The standstill detection dynamically adjusts to various motor sizes in star or delta connection. No further tuning is required. Once standstill is detected, a braking current continues to flow through the motor for an optimized after-braking time of only 0.5 seconds.
The device monitors the requirements of the professional association according to GS-HO-01 regarding braking times and fault detection. If, due to incorrect setting of the braking current, overload, or aging, the permissible braking time of 10 seconds is exceeded three times, the brake brings the system to a standstill.
If the necessary braking duration exceeds 14 seconds, the brake shuts down immediately. In this case, the motor may continue to run. A subsequent start is prevented. Both locks are released by a power interruption.
Furthermore, the brake monitors the internal power semiconductors and the external circuitry. The current regulator prevents current run-up during overload. The sensor detects any interruption in the braking circuit and prevents any further starts.
When the control is connected to the mains, the brake performs a brief self-test, during which the braking current is activated for about 200 milliseconds. After approximately 0.5 seconds, the control is ready for a motor start.
Commissioning
The required braking current depends on the motor used and the flywheel mass. For this reason, it may be necessary to change the factory preset. The braking current must be adjusted at the potentiometer so that the motor comes to a stop within 10 seconds. Braking times under 3 seconds result in unnecessary heating of the brake and the motor and should be avoided. The braking current should be monitored during adjustment with a clamp-on ammeter or a DC current clamp (with True RMS) and must be below 20A.
Ensure that the maximum braking time is maintained with all tools and saw blades. Once the one-time setting is completed, the control is ready for operation.
In standby and when the motor is running, the green LED lights up. During the braking process, the green LED blinks. If the red LED lights up, the braking time has been exceeded or another fault has occurred. The brake now blocks a further start of the motor. The block is released when you briefly disconnect the device from the mains.
Installation Note
The motor connection cable should be kept as short as possible. Cable lengths over 10 meters can become critical for the standstill detection. To prevent interference radiation, the motor cable must not be installed alongside other high-frequency control lines.
Note
On machines with belt drive, gear reduction, and unfavorable settings, resonance may occur during braking depending on the motor, which can interfere with standstill detection. This can often be resolved by changing the setting of the braking current. If you need assistance with this, please contact us.
Generator operation is possible if it is sufficiently dimensioned.
Not suitable for transformers and inverters.
