MAINTENANCE MANUAL – ELECTRIC ROTARY DRYER
FERREX ENGINEERING LTD.
Page 13
Ref. #2278
4. OPERATION
The electric dryer comes with controls that the operator can run in automatic or manual.
If the operator selects automatic (Dynamic Dry) he/she is asked to dial in the output moisture
target level. Dynamic Dryer takes care of all the other parameters automatically.
If the operator selects manually all the control variables will default to a standard setting for your
material you are running at site. This is set up at site during commissioning. The dryer has been
designed with some adjustments that in maual the operator will have to change up or down.
1. The infeed tube vibrator is controlled using a VFD
2. The drum speed is controlled using a VFD
3. The primary heater increase or decrease the temperature to change material moisture
level. The primary air fan is controlled using a VFD to control the amount of air passing
through the heater and drum. DO NOT CHANGE THE AIR FLOW VFD
4. The fan needs to be running prior to turning on the heater selector switch (electrically
interlocked)
5. The secondary increase or decrease the temperature to change material moisture level.
The secondary heater fan is controlled using a VFD to control the amount of air passing to
the baghouse. DO NOT CHANGE THE AIR FLOW VFD
6. The bag house exhaust fan is controlled using a VFD to control the amount of air being
exhausted out of the baghouse. DO NOT CHANGE THE AIR FLOW VFD
