Dold BA9034N Ministop DC Motor Brake Relay For Woodworking Machinery
Dold Ministop Motor Brake Relay Type BA 9034N
A compact general purpose DIN rail mounted motor brake relay with a self supplied auxiliary erived from the motor Voltage, suitable for asynchronous motors rated from 500 W to 7.5 kW, or greater if optimum stopping time is not required.
Size 45mm x 73mm x 122mm (WHD)
Dold BA9034N Specifications:
Braking current (IB) is adjustable via a potentiometer scaled 10-100% (2.5A to 25A), with a built in current limit which is scaled to the actual current % setting. Indication is via two yellow LEDS which indicate power connected,
fault indication and DC current injection.
The DOLD BA9034 incorporates standstill monitoring with null adjustment via potentiometer (n0) and an internal contactor which connects the DC output of the relay to the motor. The inter-lock contact X5 X6 is utilised to avoid motor restart while injecting braking current and a built in safety brake override timer will stop the braking cycle if standstill is not detected within the safety time. A 12 sec safety time is standard with 32 sec available on request.
Braking is normally initiated by a close - open - close Volt free contact sequence at terminals X3 £ X4 , usually the opposite to the main motor contactor sequence. However if this contact fails to function, BA 9034 has a built in back EMF detection circuit which will automatically detect motor turn off and a braking cycle will be initiated.
When monitoring the injected DC current we recommend the use of a true RMS or moving iron instrument to limit the injected current to no more than 2.8 x the motor rated current for delta connected motors or 2 x the motor current for star connected motors or 25A which ever is achieved first, low reading errors will often occur with other types of instrument.
Nominal Voltage UN: AC 230 V ± 10 %, AC 400 V ± 10 %
Nominal frequency: 50/60 Hz ± 3 Hz
Permissing braking current: 2 ... 10 Aeff , 5 ... 25 Aeff , 5 ... 32 Aeff
Duty-cycle at max. braking current: 8 %
Braking voltage: DC 10 ... 190 V
Max. braking time: 11 s
Braking delay for fade out of back EMF: auto optimising (0.2 ... 2 s)
Nominal consumption for control circuit: 5 VA
Short circuit strength max. fuse rating
Line protection: 20 A gG / gL IEC/EN 60 947-5-1
Assignment type: 1 IEC/EN 60 947-4-1
Semiconductor fuse: max. 1200 A2 s Typ gR
Assignment type: 2 IEC/EN 60 947-4-1