Service manual

SERVICE MANUAL TNC 415B/425
Page 127
Issue: 20.08.95
b) Cyclic Offset Adjustment via Machine Parameters
In the machine parameter MP1220 the cycle time is defined [1s] after which an offset is compensated
by one converter step.
To switch off the automatic offset adjustment, enter the value 0 in the machine parameter MP1220.
*
NOTE:
If an offset voltage of 100 mV is reached with automatic offset adjustment, the control switches off,
generating the error message
GROSS POSITIONING ERROR <axis><CPU number> E
c) Offset Adjustment at the Servo Amplifier
• Check and adjust the following machine parameters. (Note down the original values before changing.)
MP Entry Value Function Original Entry
Value
1080.0
1080.1
1080.2
1080.3
1080.4
0
0
0
0
0
integral factor
1220 0 cycle time for
automatic offset adjustment
1390 0 feed forward control ON
1510.0
1510.1
1510.2
1510.3
1510.4
≥ 1
≥ 1
≥ 1
≥ 1
≥ 1
KV factor for feed forward control
7290.X 6 display step = 0.1 µm
• Switch position display to LAG (display of servo lag); see section 18.3.
• Cancel the offset compensation with code number (see item a)
• Adjust the offset at the servo amplifier until the values of the individual axes are zero or oscillate
symmetrically about zero.
• Reset the machine parameter values and the position display to their original values.
18.5.2 Axes with Integral Digital Speed Controller
With axes with integral digital speed controller (TNC 425, corresponding bit of MP1900 = 1)
the offset adjustment as described in section 18.5.1 is not required.
.