Holding Brake Release Delay; Holding Time After Ramp Down - Siemens MICROMASTER 440 Parameter Manual

Parameter Description
Caution:
1. To activate the motor holding brake, in addition to parameter P1215 = 1, the status signal r0052 bit 12
"motor holding brake active" must be output via a digital output. The user must also select the signal -
e.g. in parameter P0731.
2. If the motor holding brake is controlled by the drive inverter, then for potentially hazardous loads (e.g.
suspended/hanging loads for crane applications) the drive inverter may not be conditioned unless the
load has been secured. Before commissioning, potentially hazardous loads can be secured as follows:
- lower the load to the floor, or
- during commissioning or after replacing the drive inverter, prevent the drive inverter from controlling
the motor holding brake. Only then should STARTER be used to carry-out a quick commissioning or
a parameter download, etc. The motor holding brake terminals can then be re-used (for the motor
holding brake, in this case, it is not permissible to parameterize the system so that the digital output
P0748 is inverted).
3. In order to hold the motor against the mechanical brake at a certain frequency, it is important that the
min. frequency P1080 approximately corresponds to the slip frequency.
- If the value is selected to be too high, then the current drawn can be too high so that the drive
inverter trips (shuts down) due to an overcurrent condition.
- For a low value, it is possible that the torque cannot be established to hold the load.
4. It is not permissible to use the motor holding brake as operating brake as generally it is only designed
and dimensioned for a limited number of emergency braking operations.
Note:
Parameter settings:
- To open/close, a digital output controls the motor holding brake at point 1/2 (refer to the diagram). In this
case, as prerequisite, the motor holding brake P1215 must be activated as well as the motor holding
brake selected at the digital output.
- Brake opening time P1216 greater than/equal to the time for the holding brake to open.
- Brake delay time P1217 greater than/equal to the time to close the holding brake.
- Select the minimum frequency P1080 so that it acts like weight equalization.
- A typical value of the minimum frequency P1080 for the motor holding brake is the slip frequency of the
motor r0330. The rated slip frequency can be calculated using the following formula:
=
f [Hz]
Slip
The following closed-loop control parameters should be observed in conjunction with the motor holding
brake:
- P1310, P1311, P1333, P1335 for U/f
- P1610, P1611, P1750, P1755 for SLVC
P1216

Holding brake release delay

CStat: T
P-Group: FUNC
Defines the brake opening time of the motor holding brake (MHB).
When the motor holding brake (P1215) is activated, then the setpoint enable is delayed by the selected
time. The time that it takes to open the mechanical brake is subject to certain fluctuations. This is the reason
that the drive inverter applies the min. frequency P1080 to the motor during this time. This means that the
brake can reliably open before the motor starts.
P1216 ≥
Release time of the brake + relay opening time(s)
Details:
See parameter P1215.
P1217

Holding time after ramp down

CStat: T
P-Group: FUNC
Defines the brake delay time of the motor holding brake (MHB).
When the motor holding brake (P1215) is activated, after an off command, the pulse inhibit is delayed by
this selected time. The time that it takes to open the mechanical brake is subject to certain fluctuations. This
means that after braking to the min. frequency P1080, the motor is held at the minimum frequency for this
time. This means that the brake can reliably close before the motor is switched into a no-current condition.
P1217 ≥
Application time of the brake + relay closing time
Details:
See parameter P1215.
142
−
r0330 n n
sy n n
⋅ = ⋅
P0310 f
n
100 n
sy n
Datatype: Float
Active: first confirm
Datatype: Float
Active: first confirm
Min: 0.0
Unit: s Def: 1.0
QuickComm.: No Max: 20.0
Min: 0.0
Unit: s Def: 1.0
QuickComm.: No Max: 20.0
MICROMASTER 440
6SE6400-5BB00-0BP0
Issue 01/06
Level
2
Level
2
Parameter List