Binder KBF 720 - Heating System Faults

Troubleshooting
4.2 Faults of the heating system
Temperature of inner chamber does not in-
crease to set temperature
Controller regularly displays the op
erating
parameters
Setting of safety controller MB1 I/O-board ex-
ceeded?
Yes
Operating error (see operating manual)
No
Optional class3.1 overtemperature set too low? Yes Operating error (see operating manual)
No
Solid state relay (-4K1) of heating defective?
Yes
Replace solid state relay (chap. 8.6,
page 82)
No
Controller MB1 I/O-board (-3N2) defective?
The binary outputs BA 4, heating element, and
BA 6, safety controller (0 – 5 V DC) are non-
functional.
Yes
Replace controller MB1 I/O-board (chap.
8.8.1, page 85)
No
Solid state relay (-5K1) for safety controller de-
fective?
Yes Replace solid state relay (chap. 8.6,
page 82)
No
Power relay (-5K2) defective?
Yes Replace power relay
(chap. 8.6, page 82)
No
Heating element (-4E1) defective?
Yes Replace heating element
(chap. 7.8, page 66)
At the binary output BA 4 of the controller MB1 I/O-board (-3N2) there must be a voltage
of +5 V DC. At the same time, the safety controller output BA 6 on the controller MB1
I/O-board must put out a voltage of +5 V DC. The solid state relays (-4K2) and (-5K1)
and the power relay (-5K2) must have picked up.
Service Manual KBF (E5.2) 04-2015 21