Current Value Changing - Mitsubishi Electric RD77MS2 User Manual

Current value changing

When the current value is changed to a new value, control is carried out in which the "[Md.20] Current feed value" of the
stopped axis is changed to a random address set by the user. (The "[Md.21] Machine feed value" is not changed when the
current value is changed.)
The two methods for changing the current value are shown below.
• Changing to a new current value using the positioning data
• Changing to a new current value using the start No. (No. 9003) for a current value changing
The current value changing using method [1] is used during continuous positioning of multiple blocks, etc.
Changing to a new current value using the positioning data
In "current value changing" ("[Da.2] Control method" = current value changing), "[Md.20] Current feed value" is changed to the
address set in "[Da.6] Positioning address/movement amount".
■Operation chart
The following chart shows the operation timing for a current value changing. The "[Md.20] Current feed value" is changed to
the value set in "[Da.6] Positioning address/movement amount" when the positioning start signal turns ON.
■RD77MS4 operation example
Positioning start signal
OFF
[Y10, Y11, Y12, Y13]
[Md.20] Current feed value 50000
■Restrictions
• The error "New current value not possible" (error code: 1A1CH, 1A1DH) will occur and the operation cannot start if
"continuous path control" is set in "[Da.1] Operation pattern". ("Continuous path control" cannot be set in current value
changing.)
• "Current value changing" cannot be set in "[Da.2] Control method" of the positioning data when "continuous path control"
has been set in "[Da.1] Operation pattern" of the immediately prior positioning data. (For example, if the operation pattern of
positioning data No. 1 is "continuous path control", "current value changing" cannot be set in positioning data No. 2.) The
error "New current value not possible" (error code: 1A1CH, 1A1DH) will occur and the machine will carry out a deceleration
stop if this type of setting is carried out.
• The error "Outside new current value range" (error code: 1997H) will occur and the operation cannot start if "degree" is set
in "[Pr.1] Unit setting" and the value set in "[Da.6] Positioning address/movement amount (0 to 359.99999 [degree])" is
outside the setting range.
• If the value set in "[Da.6] Positioning address/movement amount" is outside the software stroke limit ([Pr.12], [Pr.13]) setting
range, the error "Software stroke limit +" (error code: 1A18H) or "Software stroke limit -" (error code: 1A1AH) will occur at
the positioning start, and the operation will not start.
• The error "Software stroke limit +" (error code: 1993H) or "Software stroke limit -" (error code: 1995H) will occur if the new
current value is outside the software stroke limit range.
• The new current value using the positioning data (No.1 to 600) cannot be changed, if "0: Positioning control is not
executed" is set in "[Pr.55] Operation setting for incompletion of home position return" and "home position return request
flag" ON. The error "Start at home position return incomplete" (error code: 19A6H) will occur.
ON
0
Current feed value changes to the positioning address designated
by the positioning data of the current value changing.
The above chart shows an example
when the positioning address is "0".
3 MAJOR POSITIONING CONTROL
3.2 Setting the Positioning Data
3
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