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Readhead mounting/installation
Mounting brackets
The bracket must have a flat mounting surface, enable conformance to the installation tolerances, allow
adjustment of the rideheight of the readhead, and be sufficiently stiff to prevent deflection of the readhead
during operation.
Readhead set-up
Ensure that the scale, readhead optical window and mounting face are clean and free from obstructions.
To set nominal rideheight for RTLA50-S installations, use the blue 0.8 mm readhead spacer to set
rideheight. Adjust the readhead to maximize the signal strength along the full axis of travel to achieve a
Green LED.
Readhead set-up LED status
Green Orange Red
NOTE: A position error will trigger the
set-up LED to flash continuously until
the error is no longer present AND:
1. Power has been cycled OR
2. A position request has been
received from the controller.
Roll
0° ±0.5°
IMPORTANT: Only use
0.8 mm blue spacer.
Rideheight
0.8 ±0.25 mm
EVOLUTE RTLA50-S installation guide
Yaw
0° ±0.75°
Pitch
0° ±0.5°
Electrical connections
EVOLUTE grounding and shielding
Readhead
Connector
Shield
IMPORTANT: The shield should be connected to the machine earth (Field ground).
IMPORTANT: If the connector is modified or replaced, the customer must ensure both 0 V cores
(White and Green) are connected to 0 V.
*For maximum extension cable length please consult your local Renishaw representative.
Scale technical specifications
RTLA50-S
Material
Form
Datum fixing
Accuracy (at 20 °C)
Coefficient of thermal expansion (at 20 °C)
Maximum length*
Mass
*For lengths >2 m FASTRACK with RTLA50 is recommended.
Customer
electronics
Extension
5 V
cable*
0 V
Hardened and tempered martensitic stainless steel fitted
with a self-adhesive backing tape
0.4 mm x 8 mm (H x W) (includes adhesive)
Datum clamp (A-9585-0028) secured with Loctite 435
±10 µm/m, calibration traceable to International Standards
10.1 ±0.2 µm/m/°C
10.02 m
12.2 g/m
Serial
communication
signals
7
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