Efficient Networks S120 manual 193

Basic functions 6.8 Armature short-circuit brake, internal voltage protection, DC brake

This eliminates the necessity for using a VPM (Voltage Protection Module), for 1FE motors e.g. VPM 120 or VPM 200.

When the Motor Module supports the internal voltage protection (r0192.10=1), the Motor Module automatically decides on the basis of the DC link voltage whether the internal armature short-circuit is applied. In this case, the voltage protection is also valid if the DriveCliQ connection between the Control Unit and the Motor Module is interrupted.

A CSM (Control Supply Module) generates a 24 V supply from the DC link for the Motor Module and other components of the drive group. To ensure a stable power supply, the DC link voltage must be maintained within safe limits.

The DC link voltage is monitored in the Motor Module.

If the DC link voltage exceeds 800 V, the internal armature short-circuit is activated. This prevents switch-off of the Motor Module due to internal hardware error detection.

If the DC link voltage drops below 450 V, the internal armature short-circuit is deactivated again. This ensures that the necessary input voltage for the Control Supply Module is maintained.

Note

With the internal voltage protection active, the motor must not be powered by an external source for an extended period of time (e.g. by pulling loads or another coupled motor).

Prerequisites for the use of the internal voltage protection are:

●A Motor Module booksize is being used.

●The power unit current (r0289) must be at least 1.8 times the motor current (p0331).

●One of the following motor types was parameterized:

–Rotating permanent-magnet synchronous motor (p0300 = 2xx)

–Linear permanent-magnet synchronous motor (p0300 = 4xx)

Note

An activated internal voltage protection extends the speed range by raising the speed limits (p1082, ..) also for EMF values > 800 V. The original settings are not buffered.

CAUTION

With the internal voltage protection is active (p1231 = 3), after the pulses have been canceled, all of the motor terminals are at half of the DC link potential (without internal voltage protection the motor terminals have a no voltage condition)!

DANGER

The voltage protection is not switched-out. Kinetic energy is converted into heat (power loss) in the drive converter and motor. If the power loss is too high or if this operation takes too long, then this can result in thermal overload of the drive.

Note

Deactivation of the voltage protection can always be initiated but will only become effective after POWER ON.

Drive Functions	193
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4