PKB-M, PKB-MS Operating Manual 3
ENGLISH
Unit description
In addition to the standard PKB-M, a version is available with automatic
standstill detection, the PKB-MS. The unit comprises control logic with a
micro controller and a braking current power-semiconductor mounted on a
heatsink. Versions for 5 supply voltage ranges and 2 braking currents are
available.
Units up to 15 A/415 VAC have an integrated brake contactor.
Units 15 A/440 VAC and higher and all 30 A units require an external
brake contactor.
To operate the unit there is a membrane keypad with 4 keys and on the
front panel, a 2-line, alphanumeric liquid cristal display (LCD), each line
with 8 characters. The 90 mm width housing can be installed on a DIN-
Rail. The type description and serial number can be found on the
identification label on the side of the unit.
Features:
• Brake for preset time (PKB-M)
• Brake for preset time or brake until standstill (PKB-MS)
• Braking time can be set
• Safety times can be set
• Remote control options for braking time, braking current and manually
controlled braking
• Automatic braking current regulator
• Retentive parameter memory in the EEPROM
• Monitoring the heatsink temperature
• Load-free switching of the brake contactor
• Motor PTC-thermistor monitoring
Function sequence
The mini braking unit creates the braking moment by energising the stator
with a DC current. The braking current is regulated according to the
effective value and for setting purposes it doesn’t need to be measured
externally. Fig. 1 and Fig. 2 show the function diagrams. After applying
the supply voltage at terminals L1/A1 and L2 (linked with A2) the unit is
initialised and ready for operation. The internal motor enable relay is
energised, the contacts 8-9 close and the motor control is enabled.
By switching off the motor, the contacts 6-7 close and trigger the braking
process. The contacts 8-9 open and as such close the motor control.
Description
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