Thermo E 200/320
Installation of the circulating pump
45
5.5.
Circulating pumps U 4855 (Aquavent 6000C) and
U 4856 (Aquavent 6000SC)
These circulating pumps are equipped with a brushless motor.
5.5.1.
Soft Start
The motor starts up slowly and in a way that is gentle to the material.
It takes approx. 5 sec. until maximum speed is reached.
5.5.2.
Run-dry protection (only U 4855 and U 4856)
For speeds below 3300 rpm in the circulating pump motor a run-dry
protection is integrated. In the event the current consumption of the
circulating pump motor within a defined waiting period (U4855 Aquavent
6000C 8 up to 10 seconds, U4856 Aquavent 6000SC 40 up to 45
minuts) is below of 4A, a run-dry condition is assumed and the motor is
switched off by the error mode. A restart is possible after 120 seconds.
5.5.3.
Blocking protection
If the speed drops below 57 rpm, the motor is switched off after approx.
1 second by the error mode. If the motor does not complete a whole rev-
olution within 1 second despite the power supply, it will also be shut
down by the error mode.
5.5.4.
Error mode
The error mode switches off the motor in the event of faults. The motor
is switched to power-saving sleep mode by the error mode after approx.
5 seconds.
5.5.5.
Sleep Mode
In the sleep mode the internal consumers of the motor electronics are
switched off. The current consumption in this mode is then less as 2 mA.
5.5.6.
Motor reactivation
The motor can be reactivated from sleep mode. This is done by discon-
necting it from the power supply approx. 2 minutes. When the voltage
supply is reconnected the motor will restart in soft start mode.
5.5.7.
Polarity reversal protection
The motor does
not
feature an internal polarity reversal protection.
The Spheros circulating pumps are protected against polarity reversal
by a coded plug. If pumps of other manufacturers are used hook-up
them correctly using the system circuits (Fig. 18 and 19).
