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2S Drive Systems / 0185-1174_E_1V1_SM_C1251-2S / NTI AG
7.2.7 Regarded Safety Related Errors taken Measures
The following table lists safety related errors, possible error causes and the measures or advice for the handling.
Fault
Safe position encoder
general fault
Safe encoder stuck at
Safe encoder missing
Motor Temperature from safe stator
No Communication
Communication frozen
Safe Digital Inputs
Inconsistent values
Stuck At
Safe Digital Outputs
Inconsistency
Stuck at
Safe Field Bus
Disconnected
Bus Timing
Inconsistent data
Safety Parameter Configuration
Parameter out of range
Inconsistency
Wrong encoder type
configured
Brake Driver
Hardware fault (cannot turn off
brake current)
STO
Hardware fault, cannot turn off
the power state
The table is continued on the next page.
0185-1174_E_1V1_SM_C1251-2S / 2021-11-26 16:43 (Rev. 12500)
Measures, Discussion
The safe position encoder is permanently checked by orbit and cross monitoring.
Motor temperature is cyclically read.
Checksum and life signal are checked.
The two input channels are checked for consistency.
Not detected: Stuck at must be detected on the output module, e.g. with test pulse
The output is permanently feedbacked to detect inconsistencies.
Stuck at high is detected.
Bus cycle time is watched.
Bus cycle time is watched.
Bus is realized as black channel until the safety module. Data are CRC protected.
All parameters are range checked.
Inconsistent parameter combinations are reported as failure. E.g. non-safe encoder
selected in combination with SLS selection over safe digital inputs.
At startup the electronic data sheet from the stator is read and checked with the configured
type.
Dual channel architecture. There are two switches in series to switch off the brake current.
The drive checks periodically if the brake driver can switch off the current.
Dual channel architecture. The PWM pulse transmission for the power state can be
switched off on high and low side separately.
Page 53 of 150
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