Techne SBL-1 Bedienungsanleitung Seite 29

c Fail safe switch not functioning
d Internal electrical wiring damaged
e Heater switch not functioning
or heaters burnt out
f Failure of pneumatic safety switch
(situated within outer case)
4 Bath overheating
a Energy regulator damaged
b Heater switch damaged
alternatively, all checks in sections 3 and 4 can be carried out with the power disconnected
and by using an appropriate resistance or insulation meter.
Connect an ammeter (range up to 15 amps
a.c.) into the mains lead:-
Adjust the heater switch to the LOW position
and set the energy regulator at 10. Fluidise
the bed (continuous boiling action) and
observe that the ammeter registers approx.
4.3 amps. Position the heater switches on the
SBL-1 to the HIGH position or on the SBL-2
and the SBL-2D to the MEDIUM position and
observe that a current of approx. 13 amps
flows. On the SBL-2D a similar check should
be made for the fail safe switch on the boost
heater. If this current is not registered then
check all other items; if necessary replace the
fail safe switch.
With the electrical supply disconnected:-
remove the baseplate of the unit and carefully
check all internal wiring. Insulation meter or
resistance meter would be useful for third check.
A practical wiring layout is shown in the diagram
Connect an ammeter (range up to 15 a.c.) into
the mains lead:-
Adjust the heater switches to the LOW position
and set the energy regulator at 10. Fluidise
the bed and if both switch and heater function
correctly a current of approx. 4.3 amps will flow.
The top neon should also light. With the heaters
switched to HIGH on the SBL-1 or MEDIUM on
the SBL-2 or SBL-2D, a current of 8.7 amps should
flow. SBL-2 or SBL-2D: Switch set to HIGH 13
amps should flow. Replace either heater or switch
as necessary.
Check connecting pipe from the
control valve through to the switch.
Disconnect the rubber tube at a convenient point
and check operation of the switch by blowing into
the tube, a definite click should be heard from the
switch.
Repeat checks as in 3 b above.
Repeat checks as in 3 e above.
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