Backup Power Replacement; Features; Preset Pin - Encoder A36R Technical Reference Manual

Model A36R

5.2 Backup Power Replacement

If backup power does need to be replaced, please follow the steps below to avoid multi-turn position data loss:
• Leave main voltage at +VDC connected and powered on.
• Swap backup power source and ensure the new source is adequate. Details on suitable backup power sources can be found in
Section 4.2 and Section 4.3.1.
• The temporary backup power loss will induce a latching battery backup error. Clear this error by issuing the clear command
(SCLR). See Section 8.6.
• If unable to issue the SCLR command, perform a physical error clear by applying 0V (COM) to the Position Preset pin (PRE) for
> 30 sec. See Section 6.1.
If the low power option (XXL) is selected with the embedded batter option (EB), the entire cable assembly will need to be replaced
if using the radial mounted header (RMH) connector option. If a cabled version needs backup power replacement, contact EPC.

6. Features

Model A36R encoders provide user features to assist in configuration and troubleshooting. This section will detail features that are
common to encoders configured with both SSI and BiSS C communication protocols. Features unique to a single communication
protocol type can be found in their respective sections later in this manual.

6.1 Preset Pin

The Model A36R offers a multi-function Position Preset pin (PRE). See wiring table in the product datasheet for details.
The Position Preset pin offers two functions:
1. Defines the current shaft position as 0 ST and 0 MT
2. Issues the SCLR command to clear all errors.
To set current shaft position to 0 ST and 0 MT (preset function), the Position Preset pin should be pulled to 0V for 2-4 sec. This can
be done manually or via controller I/O pin.
To issue the SCLR command, the Position Preset pin should be pulled to 0V for > 30 sec.
Warning: If manually issuing the SCLR command, ensure you have a firm connection while
applying 0V to the Position Preset pin. If the connection is accidentally removed and
the 0V connection duration lands in the 2-4 sec window, you will inadvertently issue the
preset command and change the current encoder position.
When not being used, the Position Preset pin can be tied to 5V or left floating.
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EPC Technical Reference Manual – Model A36R
© 2023 Encoder Products Company, REV 11/08/2023