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Code. Alarm
Solution
The fan has reduced its speed in the most difficult condition; disconnect the fan, check that the damper or butterfly
closes properly, and make sure that the fan does not rotate on its own even in the absence of the ignition command
(fan drag effect). If rotation is caused by discordant airflow, check that the damper or butterfly is closed properly
Too
much
(this must be done safely: turn off the fan and wait for the fan to stop rotating) and if necessary set the deceleration
energy dissi-
time to minimum. If rotation is caused by concordant airflow, check that the damper or butterfly is closed properly
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pated by the
(this must be done safely: turn off the fan and wait for the fan to stop rotating) and increase the rotation speed
braking resi-
if necessary. Note: If the airflow is concordant with the direction of rotation, pay attention to the required speed
stor
setpoint: if this turns out to be lower than the speed imposed by the wind on the blades, the braking resistors will
always be active by increasing their temperature to the maximum allowed. In this case, the speed setpoint must be
increased. If the problem persists, contact Munters customer service to consider reducing the deceleration time.
This alarm indicates that at least one of the power phases is not reaching the motor correctly. Check through the
Fuse breaka-
help of a trained technician that there are no interruptions along the line and that all phases are correctly arriving
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ge or phase
at the motor with voltage values in the indicated range. If even after these checks, the alarm persists and the
failure
Green LED stays off, the inverter's internal fuses may have blown or the inverter itself may have been damaged.
If so, contact Munters customer service.
If the fan decreases its speed on its own (even if the setpoint is kept constant by the controller), it means that the
internal protection is kicking in. The protections that can cause a momentary speed decrease are overtemperature
Fan speed decreases
or increased outflow current. In both situations, the fan decreases speed temporarily and then resumes increasing
and then increases
speed (in accordance with the setpoint) as soon as the cause that triggered the limitation disappears (temperature
again even if the
decreases or outflow current returns below threshold). Check the NTC and IGBT temperatures, wait for the motor
setpoint is constant
to cool down; with the fan off, clean the motor heat sink fins in order to allow better dissipation of internal heat.
Check that the Id [A] (outflow current) is not too high, if so, contact Munters customer service.
If both motor LEDs are off, check that the motor protection switch and the disconnect switch at the fan side are both
operational, then with the help of a trained technician, check that indeed power is getting to the motor. If power
Both LEDs off
reaches the motor correctly, but the LEDs are both off and the fan does not turn, the internal fuses may have blown
or the inverter may be damaged; in either case, contact Munters customer service.
Speed reduction
Upon the occurrence of certain conditions that could lead to device damage, the inverter responds by automa-
tically producing that speed reduction so that it continues to operate safely and efficiently.
Situations that result in a speed reduction can be:
•
id deflux current too high;
•
bus voltage too low;
•
IGBT module or board temperature too high.
Should such a situation occur, safely check that the input voltage to the inverter is within the admissible range
and check that the motor and dissipation fins are clean, also check that the fan can spin freely.
Saturn ONE
Saturn ONE
143
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