RoboLabs Mini Robopop 25 Instruction Manual page 27

6.9 Troubleshooting
Trouble
The machine doesn't turn on.
Thermostat display doesn't read
anything.
Possible reason
1. Machine is not plugged in.
2. Emergency stop SA switch
is actuated.
3. Circuit breaker QF in OFF
position.
4. Supply cord fault.
5. Push button SB1 fault.
6. Contactor KM2 fault.
7. Relay K1 fault.
8. Open circuit.
9. Thermostat DC2 fault.
Remedy
Plug the machine in.
Turn the switch actuator clockwise
to release.
Set the circuit breaker's lever to ON
position.
Check supply cord for continuity,
replace fault cord.
Check the push button operation.
While it is pressed, contacts should
open or close (depending on contact
block type).
Replace fault push button.
Check the contactor operation. Its
core should move back and forth
easily, no short or open circuit in its
coil. While the core pushed inside,
contacts (1), (3), (5), (13) should be
closed to (2), (4), (6), (14),
respectively; and should be open as
the core is not pushed.
Replace fault contactor.
Check relay operation. When
control voltage is applied to
terminals (A1+) and (A2-), contacts
(11) and (14) must be closed;
contacts (11) and (12) must be
open, and vice versa if no control
voltage applied.
Replace fault relay.
Check continuity between:
Circuit breaker QF;
•
Contactor KM2;
•
• Relay K1;
Emergency stop switch SA;
•
Push button SB1.
•
Restore connection, face up pitted
contacts, tighten loosen contacts.
Check the thermostat. If there is no
any indication on the display while
230 VAC is applied to terminals (5)
and (6) of the thermostat, replace it.
26