16
Operation & maintenance manual, Drum filter HDF 12/16/20/24 -series
6.2 Automatic settings
The control system for HDF16, 20 and 24 series, must always be equipped with a frequency con-
verter. This is factory calibrated if delivered from Hydrotech. To perform a soft start of the drive
motor, the frequency converter settings must be min. 5 sec “ramp up” and min. 3 sec ”ramp
down”. The filter works with 50 Hz as standard.
Hydrotech control systems are available in various configurations.
If the filter is equipped with a Hydrotech standard controller, the filter has two operating modes:
1. Continuous rotation (HAND mode)
2. Automatic level control (AUTO mode).
Turn the mode selector to select the operating mode (see E in Figure 6.1).
Figure 6.1 Hydrotech control cabinet type PFC (option)
A. DRUM DRIVE TRIPPED. LED that indicates when the fre-
quency converter has tripped.
B. PUMP TRIPPED. LED that indicates when the wash water
pump’s motor protection device has tripped.
C. DRY RUNNING. LED that indicates when the dry running
protection device for the wash water pump has tripped.
D. RESET DRY RUNNING. Resetting of wash water pump’s
dry running protection device.
E. OPERATION MODE. Mode selector.
F. PUMP. Pump switch.
G. CLEANING START. Chemical wash switch, key operated.
H. CLEANING. Lamp that indicates when the chemical wash
is in progress.
I. CLEANING SEQUENCE. Selector for number of sequences,
chemical cleaning.
J. Main power switch
