5
Installation- and maintenance instruction
FläktGroup
DC_9108GB 20190206_R1
Specifications are subject to alteration without notice
Purging mode. Low control signal
The speed of the rotor in rpm. At the start, the speed is
displayed according to the rotor/motor gear ratio of 1:25.
After 2 pulses from the rotation monitor, the correct speed of
rotation of the rotor is displayed. Range: 0.2 - 99 rpm
RotoSens is selected using the DIP-switch (4) and with no
rotation sensor connected
Lit for two seconds when the magnet passes the rotation
sensor
RotoSens measures the load on the motor during
acceleration
Summer operation/cooling energy recovery
No rotation monitor - DIP 4 in the OFF position and jumper
31-32
An alarm is indicated by the letter F followed by a number.
See also the section on troubleshooting.
OPERATING INDICATORS / BUILT-IN FUNCTIONS
Two LEDs, one red and one green, are used on the
Model S for indication, while the Model E has an LED
display as follows:
OPERATING INDICATION - MODEL S
AUTOMATIC PURGING MODE / HOLDING TORQUE
When the control signal is low, i.e. <1.5V at 0-10V, the
drive system switches to purging mode. In purging
mode the motor shaft turns two revolutions every 10
minutes, which is equivalent to around 30 degrees of
rotation by the heat exchanger rotor.
It may be the case that the rotor rotates although it
should be stationary. To prevent involuntary heat
recovery a holding torque is activated to keep the rotor
still. If a holding torque has been applied and you
grasp the drive belt and try to turn the rotor by hand,
the torque will progressively increase.
PROTECTION OF THE CONTROL UNIT
The control unit has a built-in motor protection that
protects against overloading, and external motor
protection is not required. Built-in short circuit protec-tion protects
against short circuits between the phases
of the motor and between the phases and earth.
OPERATING INDICATION - MODEL E
Green
Slow flashing – Purging mode/Low control signal.
Rapid flashing – Operation, the motor rotates
continuously.
Lit for two seconds – Magnet passing rotation
sensor.
Lit - RotoSens measures the load on the motor
during acceleration.
Red
Lit or flashing LED indicates alarm; see also the
section on troubleshooting.
Protective
function
External alarm
with alarm
relay
Restart
Alarm reset
Supply fault,
over-voltage
Yes,
immediately
Automatic
Automatic
Supply fault,
under-voltage
Pre-alarm,
rotation
monitor
No
Motor not
stopped
Rotation
monitor
Yes
RotoSens
-Manual,
disconnect
and reconnect
power supply.
Rotation monitor
with sensor
-automatic.
Pre-alarm,
motor
protection/
overload
No
The system tries
to reset three
times
Automatic
Motor
protection/
overload
Yes,
immediately
Manual,
disconnect
and reconnect
power
supply.
Manual,
disconnect
and reconnect
power
supply
Short circuit
