YASKAWA Sigma II Technical Note

TECHNICAL NOTE
MOTION PRODUCT ENGINEERING GROUP
Absolute Encoder Battery Options
Subject:
Product: Sigma II
Summary:
The Sigma II absolute encoder requires a battery to backup the multi-turn data. There
are various ways of connecting the battery to the circuit that should be considered.

Battery Connection Options

In all, there are three options for connecting a backup battery for an absolute encoder. Only one
of these options needs to be used to back-up the absolute encoder. Yaskawa does not
recommend connection of multiple batteries to the absolute encoder circuit.
•
Apply a battery (YEA part JZSP-BA01)
through connector CN8. A compartment to
hold this battery is built-in to the SGDH
amplifier (see figure below). This is the
most common option and allows for the
easiest replacement of a depleted battery.
•
Apply a battery (see specifications below)
through the CN1 connector (pins 21 & 22).
•
The final method is the battery backup
cable as described in this document. The
battery backup cable is the best option in
situations where the encoder cable is
disconnected often during machine
maintenance. The backup cable will
eliminate the need to re-initialize the
encoder after encoder cable
disconnection.

Battery Specifications

The backup battery specified for Sigma II motors with absolute encoders is Toshiba ER3V* or
equivalent. This battery is a
The Yaskawa part number for the battery (with Yaskawa-added leads and connector) is
JZSP-BA01. This is the battery that is designed to be installed in the battery compartment of
SGDH amplifier.
If it is preferred to connect the absolute encoder battery through the CN1 connector, the
recommended battery is Toshiba ER6VC3*, rated at 3.6V and 2000mAh. The Yaskawa
equivalent battery is BA000518. It is not necessary to install batteries at both the host controller
and the SGDH amplifier.
*Specifications for Toshiba ER3V and ER6V batteries are available at http://www.tbcl.co.jp/tb_e/ult_a_el.htm.
Yaskawa Electric America - 2121 Norman Drive South – Waukegan IL 60085
3/6/2002
thionyl chloride lithium
(800) YASKAWA - Fax (847) 887-7280
1 of 3
battery rated at 3.6V with a life of 1000mAh.
Battery
Compartment
Battery Connector
(CN8)
SGDH
30W to 5kW
Battery Connector
(CN8)
Battery
Compartment
SGDH
6kW and up
eng/02.005/MCD