Brake; Jog Operation - Danfoss mcd-500 Operating Instruction

MCD 500 Operating Instruction

5.4.4 Brake

NB!
If the brake torque is set too high, the motor will stop before the end of the brake time and the motor will suffer unnecessary heating
which could result in damage.
MCD 500 braking:
• Does not require the use of a DC brake contactor
• Controls all three phases so that the braking currents and associated heating is evenly distributed through the motor.
100%
70%
30%
0%
1
Braking has two stages:
1. Pre-brake: Provides an intermediate level of braking to slow motor speed to a point where full brake can be operated successfully (approximately
70% speed).
2. Full brake: Brake provides maximum braking torque, but is ineffective at speeds greater than approximately 70%.
To configure the MCD 500 for brake operation:
1. Set Par. 1-11 for the desired stopping time duration (1). This is the total braking time and must be set sufficiently longer than the brake time
(Par 1-16) to allow the pre-braking stage to reduce motor speed to approximately 70. If the stop time is too short, braking will not be successful
and the motor will coast to stop.
2. Set Brake Time (Par. 1-16) to approximately one quarter of the programmed Stop Time. This sets the time for the Full Brake stage (2).
3. Adjust the Brake Torque (Par. 1-15) so that the desired stopping performance is achieved. If set too low, the motor will not stop completely and
will coast to stop by the end of the braking period.
Contact your local supplier for further information for installations using an external zero-speed sensor (e.g. applications with variable load during the
braking cycle).

5.5 Jog Operation

Jog runs the motor at reduced speed, to allow alignment of the load or to assist servicing. The motor can be jogged in either forward or reverse direction.
The maximum available torque for jog is approximately 50% - 75% of motor full load torque (FLT) depending on the motor. Available jog torque in
reverse is approximately 50% - 75% of the jog torque in forward direction. To set the jog torque level, use Par. 15-8.
NB!
Setting Par. 15-8 above 50% may cause increased shaft vibration.
3
177HA511.10
2
Time
MG.17.K2.02 - VLT ® is a registered Danfoss trademark
5 Application Examples
1: Stop time (Par. 1-11)
2: Brake time (Par. 1-16)
3: Coast to stop time
5
37