8
Display
Display is visible with open and closed cover. The display shows current status for controller, stepper motor and if
rotor runs. See table 15.4. For alarm codes see table 19, page 11.
Rotation monitoring
Due to the stepper motor and rotor are mechanically connected through a belt, it is necessary to monitor whether
the rotor is rotating.
•
If the motor is no longer turning the rotor due to a lack of tension or a broken/ damage belt, the DRHX
controller will trigger a
“rotor guard” alarm (E01).
•
The DRHX has two possibilities of rotor monitoring systems: internal and external.
•
The factory setting is “Internal rotor guard”, external is an option (Hoval option RG3).
Internal rotor guard
The internal rotor guard monitors the rotation of the rotor by measuring the electronical signal returning from the
motor, will take place every 10 seconds.
•
After five consecutive failed detections within 1 hour the alarm E01 is given (see page 11).
•
The internal rotor monitor works automatically with a motor speed above 25 rpm.
External rotor guard
If external rotor guard is wired
, “Internal rotor guard” will be automatically deactivated.
An external sensor (3 wired) can be connected to the digital input ports (Hoval product code/ option RG3).
See instructions on next page.
