TA-05KB-SMD & TA-1K-SMD
Instruction and Operating Manual
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5
6 Troubleshooting
For fast end effective troubleshooting proceed as follows:
Check drive for:
a) intermittent and loose connections
b) defective insulation of connecting leads
c) defective motor (brushes etc.).
CAUTION!
Not use any Megohmmeter, buzzer or similar test instruments. Test instruments must be galvanical-
ly separated from the AC line. The electronic circuit carries a voltage potential against ground.
Possible causes
Output voltage does not increase when speed
potentiometer is turned up
a) check lead connections, terminals 7 and 8.
b) no control voltage, plus 24 V, check power sup-
ply. LED 2, line, does not light up.
c) defective fuse Si (10A FF - TA-1K)
(16A FF - TA-1K).
d) relay K1 is defective.
a) motor load is to high.
b) defective speed potentiometer.
c) current limit is set to low.
Relay K1 is not energized when drive is re-
leased, (yellow diode LED 1 does not light up)
Drive runs unstable
a) I x R compensation is set to high (when armatu-
re feedback controlled).
b) defective tachometer or tachometer leads.
c) improper setting of stability potentiometer P6.
d) wrong connection of auxiliary series field of d.c.
motor.
Speed varies without change of setting of
speed potentiometer
a) current limit is set to low (LED 3,Current Limit,
lights up).
b) motor is overloaded, mechanical defect, (LED
3, Current Limit, lights up).
c) defective supply for electronic circuit, +/- 15 V
DC incorrect.
d) defective Thyristor (defective SCR-bridge).
e) defective tachometer or tachometer leads.
f) defective speed potentiometer.
Fault location
Symtom
