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TROUBLESHOOTING
The following are possible actions that can be taken when a specific alarm occurs:
Cod. Allarme
Soluzione
1
High voltage Check that the input voltage is within the range allowed by the device or that no voltage spikes occur.
Check that the input voltage is within the range allowed by the device or that there are no voltage dips.
2
Low voltage
Note: The reporting of the low voltage alarm when shutting down the device is to be considered normal
Check that the ambient temperature at which the device is operating is within the proper operating range of the
equipment.
Temperature
Check that the fan meshes are clear and that the motor dissipation fins are clean so that the inverter can properly
3
too high
dissipate internal heat.
Wait for the temperature of the device to drop (below 80°C for the IGBT module and below 105°C for the board)
before requesting a new movement.
The inverter detected too high a current, so it reduced the speed and tried again at the required RPM three times
in succession. Check that the fan is free to rotate without hindrance (for safety reasons, ensure that the fan is
switched off before carrying out the checks).
Check for possible bearing problems by checking that there is no play on the fan's axis of rotation (for safety
Current
too
reasons, make sure the fan is switched off before carrying out checks).
4
high (lock)
Check that the input voltage is within the correct operating range of the equipment and that the cable cross-section
in use is adequate.
Try resetting the alarm and retry the movement or turn the device off and on again after waiting at least one minute
for the internal capacitors to fully discharge.
Check with Munters that the acceleration at start-up is not too high (boost).
Loss of syn-
Try resetting the alarm and retry the movement or turn the device off and on again after waiting at least one
5
chronism
minute. Check with Munters that the minimum speed is not too low (FF to FOC) or that the acceleration at start-up
(lock)
is not too high (boost).
No action required, the device autonomously retries the movement up to a maximum of three consecutive times.
The time interval between one attempt and the next is increasing: following the first alarm the device waits a time
Current
too
6
of 1 second before repeating the movement, following the second error the wait before the new movement attempt
high
is 10 seconds while on the third alarm the last movement attempt is delayed by 20 seconds.
In case all three restart attempts fail, the device generates the alarm
No action required, the device autonomously retries the movement up to a maximum of three consecutive times.
The time interval between one attempt and the next is increasing: following the first alarm the device waits a time
Loss of syn-
7
of 1 second before repeating the movement, following the second error the wait before the new movement attempt
chronism
is 10 seconds while on the third alarm the last movement attempt is delayed by 20 seconds.
In case all three restart attempts fail, the device generates the Loss of Synchronism (lock) alarm.
Lack of inter-
8
nal communi-
No action required, device reboots automatically
cation
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
9
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
10
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.
Saturn Breeze
Saturn Breeze
101
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