Velocity Edge GX440 Instructions d'exploitation télécharger pdf (Page 354)

Functions, monitoring, and protective functions

9.4 Extended functions

Drive converter cabinet units

354 Operating Instructions, 10/2008, A5E00288214A

Example 2: Emergency brake

If emergency braking is required, electrical and mechanical braking is to take place

simultaneously. This can be achieved if OFF3 is used as a tripping signal for emergency

braking:

p1219[0] = r0898.2 (OFF3 to "apply brake immediately").

To prevent the converter working in opposition to the brake, the OFF3 ramp (p1135) should

be set to 0 seconds. Regenerative energy may accumulate, and this must be either fed back

into the supply system or converted into heat using a braking resistor.

This is often used, for example, in calendar stacks, cutting tools, running gears, and presses.

Example 3: Service brake on crane drives

For cranes with manual control, it is important that the drive responds immediately when the

control lever is moved (master switch). To this end, the drive is powered up using the on

command (p0840) (the pulses are enabled). Speed setpoint (p1142) and speed controller

(p0856) are inhibited. The motor is magnetized. The magnetization time generally applicable

for three-phase motors (1-2 seconds) is, therefore, eliminated.

Now, only the brake opening time will delay the motor starting to rotate following activation of

the master switch. Movement of the master switch generates a "setpoint enable from the

control" (bit interconnected with p1142, p1229.2, p1224.0). The speed controller is enabled

immediately and the speed setpoint is enabled once the brake opening time (p1216) has

elapsed. When the master switch is in the zero position, the speed setpoint is inhibited and

the drive ramps down along the ramp-function generator's ramp-down ramp. The brake

closes once the standstill limit (p1226) is undershot. Once the brake closing time (p1217)

has elapsed, the speed controller is inhibited (the motor is no longer generating any force).

Extended braking control is used with the modifications described below.

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Figure 9-13 Example: Service brake on a crane drive

1 2 ... 349 350 351 352 353 354 355 356 357 358 359 ... 529 530

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Velocity Edge GX440 Instructions d'exploitation Page 354

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