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Mitsubishi Electric QD77MS User Manual Page 64

Simple motion module.
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When "1 _ _ _ h" is set in the servo parameter "Scale measurement mode selection
(PA22)", the synchronous encoder axis current value and the synchronous encoder axis
current value per cycle are restored after the servo amplifier axis is connected. Therefore,
connection becomes valid, and will be on the counter enabling status. (The current value
setting by current value change is required beforehand.)
When "2 _ _ _ h" is set in the servo parameter "Scale measurement mode selection
(PA22)", "0" is set to the initial value of the synchronous encoder axis current value and the
synchronous encoder axis current value per cycle after the servo amplifier axis is
connected. Therefore, connection becomes valid, and will be on the counter enabling
status.
If the corresponding servo amplifier axis is not connected, the connection of the
synchronous encoder axis will be invalid.
POINT
When "1_ _ _h" is set in the servo parameter "Scale measurement mode selection
(PA22)" and the synchronous encoder movement amount (encoder pulse units) on
disconnection or during the power supply OFF exceeds "2147483647" or
"-2147483648", the synchronous encoder axis current value is restored with its
opposite sign.
Points of the setting method
• "Scale measurement mode selection (PA22)" is set to the servo amplifier set by "ABS" or
"INC" from the "External synchronous encoder input" list of the amplifier setting dialog
using the Simple Motion Module Setting Tool.
• When the servo parameter "Scale measurement mode selection (PA22)" is changed, it is
required to switch the power of servo amplifier off once after the parameter is transferred
to the servo amplifier, and then switch it on again.
• If the servo amplifier set by the servo parameter "Scale measurement mode selection
(PA22)" does not support the "Scale measurement mode", "AL.37" (parameter error) will
occur in the servo amplifier. Refer to the servo amplifier instruction manual for details of
the servo parameter "Scale measurement mode selection (PA22)".
• The synchronous encoder via servo amplifier can be controlled up to 4. However, there is
no restriction for the number of connections. Therefore, the error check is not executed
even when the external synchronous encoders are set more than 4 on the system setting
screen using the Simple Motion Module Setting Tool.
• The following information of the synchronous encoder via servo amplifier can be output
with the optional data monitor. The setting details of the optional data monitor for the
synchronous encoder information are shown below.
Information of synchronous encoder
Scale position within one-revolution
Scale absolute counter
• A serial absolute synchronous encoder Q171ENC-W8 can be used in an incremental
system by setting "2 _ _ _ h" in the servo parameter "Scale measurement mode selection
(PA22)" even if the battery of the servo amplifier is dismounted.
QD77MS
Setting detail for optional data monitor
24: Load side encoder information 1
(Used point: 2words)
25: Load side encoder information 2
(Used point: 2words)
2 - 16
Chapter 2 Input Axis Module
LD77MS
QD77MS
LD77MS
QD77MS
LD77MS

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