Lenze 931K - Manual (Page 76)

Parameter setting
Power stage parameters
Overview
7
l
76 KHB 13.0002−EN 4.1
7.3 Power stage parameters
7.3.1 Overview
The power stage of the drive controller comprises several safety functions, some of which
can be parameterised:
ƒ Controller enable logic (software and hardware enable)
ƒ Overcurrent monitoring
ƒ Overvoltage / undervoltage monitoring of the DC bus
ƒ Power stage monitoring
7.3.2 Description of the objects
Object 6510_10
h
: enable_logic
{
Danger!
Dangerous voltage
Even if the digital input DIN9 (controller enable) is not set, a dangerous voltage
may be applied to the motor.
Possible consequences:
ƒ This means a danger to life when working on the motor.
Protective measures:
ƒ Disconnect the motor from the mains before starting to work on it.
With a rising edge and a HIGH level at the digital input DIN9 controller enable is detected.
To enable the activation of the controller’s power stage, the drive controller must be in the
"ready for operation" state.
If this is the case, the drive controller changes to the "switch on power stage" state and the
microprocessor activates the power transistors.
This in turn means that a previously switched−on power stage cannot be switched off if the
microprocessor is defective. The only possibility to switch off the power stage in this case
is to switch off the DC bus and the logic supply.
The drive controller’s response to the cancellation of the signal depends on the operating
mode:
ƒ Positioning operation and speed−controlled operation
When the signal is cancelled, the motor is braked along a defined deceleration ramp.
The power stage is switched off when the motor speed falls below 10 rpm and the
eventually existing holding brake has been applied.
ƒ Torque−controlled operation
When the signal is cancelled, the power stage is immediately switched off.
Simultaneously an eventually existing holding brake is applied. This means that the
motor coasts without braking or is only stopped by the eventually existing holding
brake.