DR. JOHANNES HEIDENHAIN GmbH
D 8225 Traunreut .Tel.(O8669)31-0
SERVICE MANUAL TNC 151/155
Paqe 9
Kundendienst
Se&ion 2.2.2
VDU Display (flashing)
EMERGENCY-STOP $I;tii
GROSS POSITIONING ERROR A
Fault cause
With standard PLC program, faulty reply
from output A6 ("Lock for spindle on") to
input E20 ("reply: Lock for spindle on")
Fault message EMERGENCY-STOP PLC
appears only when no additional PLC marker
is set for
the
fault message
.Trailing error greater than value
entered in MP 174.
(see Mounting Instructions and Interface
Circuit Control-Machine manual
.Deviation from the intended position at
standstill greater than the value entered
in MP 169
(see Mounting Instructions and Interface
Circuit Control-Machine manual
.Exceeding the range for the continuous po-
sition supervision determined by MP 57.
(see Mounting Instructions and Interface
Circuit Control-Machine manual
.Relationship between output voltage and
traversed distance outside of the defined
tolerance.
-Defect in the pulse counting section (Con-
trol circuitry) after the transducer signal
supervision
Possible fault location
Terminal hoard (TNC 151/155 B)
In the Case of Gross Positioning Errors
A/B/C/D the fault could lie with any
element in the closed loop servo system.
ie Control hardware (CLP Processor/
Graphics Bra.),
Control hardware (Analog Brd.),
servo amplifier (offset voltages),
n
II
(gain too low),
motor,
tacho,
measuring system,
external forces acting on drives,
inappropriate MP values prograuaned.
Aid:
1. Program
MP
54 (acceleration) as
small as possible.
2. Adjust rapid traverse (as small a
trailing error as possible).
3. Gradually increase MP 54.
If this does not help:
fault in the Control hardware (closed
loop) or in the machine
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