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Installation
For the safety function to be valid the instructions detailed in this installation guide must be
followed. The information relating to all scale types and mounting options is listed. The builder/
installer/maintainer/ repairer must apply the instructions for the product being installed as defined
by this installation guide.
The following general conditions must be observed during installation:
•
Observe ESD handling precautions when handling the cable connectors.
•
Cleaning mating surfaces before mounting the scale.
Commissioning test
The following checks MUST be performed following installation and commissioning of the TONiC FS
encoder system for the first time, and also following repair of the system (replacement systems parts):
Axis movement check
Move the axis over its full travel to verify the following:
•
Position output is correct within a tolerance of ±10%.
•
Direction of movement is correct.
•
The signal amplitude for both sine and cosine signals falls within the limits defined in
'Evaluation unit monitoring'.
NOTE: Should the working temperature of the readhead need to be measured attach a suitable
sensor directly to the aluminium readhead housing. Do not attach to the label that shows the
product details. Do not drill into the housing as this may compromise the sealing or technical
function. Route the sensor cable away from moving parts and along the same path as the
readhead cable.
14
TONiC™ FS RELM20/ RSLM20 Functional Safety installation guide and safety manual
Evaluation unit monitoring
To achieve full system integrity the evaluation unit must continuously monitor the analogue
outputs and, in the case of fault detection, place the system into a safe state within the process
safety time.
Signal amplitude check
Nominal signal amplitude value is 1 V, indicating full signal
strength where √ (sine
A fault condition must be asserted if the analogue output is
≤ 0.7 V and ≥ 1.35 V.
Sine/cosine cross check
Sine and cosine signals must be evaluated separately and
the results compared. A fault condition must be asserted if the
phase shift is incorrect with reference to the safe position limit
for the system, see
49
or
'DOP interface output specifications'
Following error check
Following error is defined as the difference between the
expected position and position feedback. A fault condition must
be asserted if the following error exceeds the safe position limit
for the system.
NOTES:
•
The evaluation unit must achieve medium diagnostic coverage (≥ 90%) according
to ISO 13849.
•
Improper setting of the switching thresholds and hysteresis in signal evaluation can result in
incorrect determination of direction of movement, position or speed.
•
A persistent fault condition may indicate a hardware failure of the TONiC FS system or an
installation problem.
+ cosine
) = 1 V.
2
2
'Ti interface output specifications'
on page
on page 51.
Original instructions
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