
9.SPINDLE FUNCTION B-63783EN-1/01
- 798 -
- Electrical specification of analog spindle interface
The signals related to analog spindle interface are described below.
The ENB1/2 signal is set to 1 if the command output to the spindle is a
non-zero value. If the command output to the spindle is 0, the ENB1/2
signal is set to 0.
For an analog spindle, this signal can be used as a control signal to
forcibly stop spindle motor rotation when an offset voltage exists in the
spindle motor speed amplifier, which turns the spindle motor at low
speed even if the command output (analog voltage in this case) to the
spindle is 0.
CAUTION
Since the analog voltage is a very low-level signal, it
must not be connected via a contact.
- Position coder feed back signal
To perform feed per revolution and threading, a position coder must be
connected. The position coder is used to detect the actual spindle speed
and the one-rotation signal (used for detecting a fixed point on the
spindle during threading). FANUC recommends the connecting of
position coders to spindles on a one-to-one basis. When a gear ratio is
used, set a gear ratio in parameter Nos. 5847 and 5848 to cause position
coder deceleration.
The position coder must always issue a one-rotation signal at a fixed
position on the spindle.
For the connection of a position coder used for operations such as rigid
tapping and spindle positioning, see the descriptions of the relevant
functions.
ENB2
ENB enable
signal output
nalog voltage
output of spindle
speed
SVC
ES
ES
SVC
ENB1
Control unit
Max. +10V
2mA
Output
impedance
100Ω
Name Connector/pin
SVC JA8A/7
ES JA8A/5
ENB1 JA8A/8
ENB2 JA8A/9