Manual - Formech 450DT V1.0 - 0317
31
Service / Repair
Electrical Troubleshooting
Before any maintenance work is carried out, electrical supply must be locked in the OFF position
or the mains lead removed.
Faults on electrical & electronic modules are rare but loose plugs and terminals are responsible for most
electrically based failures. A logical approach to detecting the fault begins with a complete appraisal of the
faults and symptoms.
Much time can be wasted looking in the wrong areas for a problem that, when found, was obvious.
See also section dealing with Electrical circuit information.
If you are a qualifi ed electrical technician and conversant with electrical fault-fi nding techniques, then refer
to the circuit information at the rear of this manual. If you are uncertain then contact Formech for service
and advice.
Quartz Heating element and heating zone resistances.
Only a qualifi ed electrical technician may work on any parts carrying mains voltage and should
be responsible for ensuring that the machine is in a safe condition before allowing services to be
restored.
ZONE / ELEMENT TYPE
RESI/- 5%
ZONE 1
108Ω
ZONE 2
50Ω
ZONE 3
215Ω
ZONE 4
178Ω
250W Quartz Element
215Ω
300W Quartz Element
178Ω
550W Quartz Element
100Ω
If zone 1 or 2 has a resistance measurement that is double that of the schedule above then it would imply
that one of the 2 elements in that zone has failed, check the individual elements.
Equipment fusing – Fuses are a safety device. If a fuse fails then it is likely that there is a reason for the
failure – overcurrent or short-circuit.
If the fuse protection continues to fail after replacement then the cause will need to be investigated by a
qualifi ed and competent person using a methodical approach to fault-fi nding diagnostics and referring to
the circuit information contained in this user manual.
The same will apply to any non-functioning parts such as the vacuum pump, valve, heater zone outputs, PLC,
HMI and any other malfunction of the control system.
