ZIEHL-ABEGG FXDM Operating Instructions Manual

Contents

ZIEHL-ABEGG FXDM Operating Instructions Manual Manual pdf 78 page image

9.12.6 Setting Current limitCurrent limitAs an additional safety function the device has a current limit, this can be adapted ifnecessary.The setting refers to the motor rated current of the device (100 % = setting: MotorRa-tedCurr.).On exceeding the percentage value set here, the modulation is reduced until the setcurrent is set again. This prevents overloading of the motor.Setting range: 100...130 %Factory setting: 120 %E1 ActualActive current limit is signaled by a bright triangle in the display9.12.7 Setting brake functionDC brake modeDC brake modeSetting function of DC-brake for frequency inverters.For units that come with a factory engaged DC brake mode (if extant, DC brakemode setting), simultaneously activating the “DC brake mode ” only makes sense inexceptional cases.0 = no brake function (factory setting).1 = brakes before start (before modulation is returnd)If, under certain circumstances, the modulation switches back on while the motor is stillrotating fast, this can result in a re-supply of the inverter’s “overcurrent disconnection”.The brake function can be activated to prevent this. This is then always active for anadjustable period before triggering starts. I.e., the brake function is always initiatedbefore modulation after has it returned to “0”. The suitable adjustments depend on thecentrifugal force of the motor and the conditions in the installation.2 = Special function, brakes before stop (as soon as modulation “0”).The motor does not run out up to stop. The motor is braked actively, as soon as nomodulation is present (Setpoint = “0” or Enable = “OFF”) .Test required. The “min. speed” adjustment must be set to “0”.Attention! With the frequently one behind the other following DC bracings it can cometo strong heating up of the motor.To prevent any overheating, motor protection in the form of a temperature limiterinstalled in the motor is required ( motor protection).DC brake timeDC brake timeMaximal length of DC-brake for frequency inverters.If the braking is activated, the d.c. brake torque is active for this time.Setting range: 0...250 sec.factory setting: 5 / 10 sec. (depending on device type)DC brake levelDC brake levelDirect-current level, generated for braking. The higher this value, the greater thebraking effect.The setting “DC brake level” refers in % to the value set in “MotorRated Curr.”.Setting range: 0...50 % / 25, 50, 75, 100 % (depending on device type)factory setting: 5 / 25 % (depending on device type)The setting is dependent on the size of the fan/motor. Attention! Too high values canlead to a considerable braking effect.Same setting affects also the function “Motorheating”( IO Setup).Operating Instructions Fcontrol – model series FXDM ProgrammingL-BAL-E072-GB 1642 Index 008 Part.-No.78/105