Function description - EF safety function
KW compact inverter modules with integrated EF safety function to protect against restart.
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Inspected by TÜV SÜD in acc. with: |
EN ISO 13849-1 (Cat.4, PL e) |
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The EF safety function is redundantly executed. The norm specifications are fulfilled through the use of a two-channel hardware logic (EF/EF2) in combination with two-channel software monitoring found on the controller card.
Interrupting the control inputs EF/EF2 will cause the trigger signals for control of the power output stages to be safely blocked in two channels. The motor is in a secure state without having the drive system completely separated from power.
The power output stage enable EF/EF2 may only be removed with the controller enable RF switched off and the motor in stand-still. Shut-down of EF/EF2 during the run will create an error message in the drive and the motor runs down.
The evaluation of the outputs QEF/QES is not safety-relevant and therefore not part of the certification.
Function:
The power output stages are unblocked by setting the signal EF AND EF2. EF and EF2 must be controlled with one switching path each. The single-channel control of the signals EF and EF2, for example by bridging the two signals, is not certified.
After these have been enabled, the drive can be powered by setting RF controller enable.
The output QES=1 signals that the output stages is safely blocked in two channels.
The output QEF=1 signals that at least one EF and/or EF2 signal has been set. The output stage is not blocked or only one channel is. (QES = 0). The single-channel control of the signals EF and EF2, e.g. by a bridge, is not part of the certification and does not correspond to the safety category PL e according to EN ISO 13849-1.
Individual fuse protection:
Each module is controlled separately. Acknowledgement signals are available for every module. The power output stage can in this way be blocked and unblocked independent of other drives.
Individual device fuse protection KWD/KWZ
Control and acknowledgement signals are transmitted. The power output stages A and B can be blocked and unblocked as a group.
Group fuse protection:
Control and acknowledgement signals are forwarded by each module. The power output stages for all modules can be blocked and unblocked as a group.
Signal description for power output stage enable
The compact double inverters KWD and KWZ consist of two power output stages A and B in one casing. The signals are complemented by supplement A or B.
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Signal |
Direction |
Meaning |
|---|---|---|
|
EF |
E |
Control signal, power output stage enable EF |
|
EF2 |
E |
Control signal, power output stage enable EF2 |
|
QEF |
A |
Acknowledgement of control signal, power output stage enable min. 1 control signal for EF/EF2 power output stage enable is set |
|
QES |
A |
Output stage safely blocked |
|
WEF |
E |
Reference potential 0 VDC ext. for control signals EF/EF2 |
|
WQF |
E |
Supply 24 VDC ext. Power supply for relay contact QEF |
|
WQS |
E |
Supply 24 VDC ext. Power supply for relay contact QES |
Acknowledgement signals QEF / QES
|
Input EF |
Input EF2 |
Output QEF |
Output QES |
Meaning |
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|---|---|---|---|---|---|---|
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0 |
0 |
0 |
1 |
Power output stages safety blocked, two-channel Motor is not supplied with power, setting of controller enable RF=1 triggers an error message.
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0 |
1 |
1 |
0 |
Power output stages blocked one-channel Motor is not supplied with power, setting of controller enable RF=1 triggers an error message.
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1 |
0 |
1 |
0 |
Power output stages blocked one-channel Motor is not supplied with power, setting of controller enable RF=1 triggers an error message.
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|
1 |
1 |
1 |
0 |
Power output stages unblocked Motor can be supplied with power by setting controller enable RF=1.
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Drive behaviour
Responses of module to various switch statuses
(>> represents the signal change)
|
Input EF |
Input EF2 |
nact [rpm] |
RF |
Drive response |
Response to errors |
|---|---|---|---|---|---|
|
0 |
0 |
0 |
0 >> 1 |
Error message 2320 |
Set RF 1 >> 0 Run command FL Clear error Wait for SBM |
|
0 |
1 |
0 |
0 >> 1 |
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|
1 |
0 |
0 |
0 >> 1 |
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|
1
|
1 |
0 |
0 >> 1
|
The drive is supplied with power |
|
|
1 |
1 >>0 |
≠ 0 |
1 |
Power supply to motor is immediately cut. The motor runs down. Error message 2320 |
Set RF 1 >> 0 Run command FL Clear error Wait for SBM |
|
1 >> 0 |
1 |
≠ 0 |
1 |
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1 >> 0 |
1 >> 0 |
≠ 0 |
1 |
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