ALARM DISPLAY
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ENABLE INPUT
The device is equipped with an enable input that allows you to activate/deactivate the motor.
During the rst start-up or if there are no alarms, the absence of the enable signal causes the "-" symbol to appear on the
display and the motor control relay to de-energize.
In normal conditions, when enabled, a segment is turned on on the display which rotates along the "0" and the command
relay is energized to activate the motor.
On power-up, the rotation speed with which the segment lights up is low: this indicates that the motor is starting up for the
set DT inhibition time (IMax and PFmin are not measured).
In the following phase, the segment rotates at a higher speed: this indicates that the motor is operating normally and that
the alarm control is again active.
If the enable signal is removed after the appearance of any alarm, the latter signal remains xed on the display. When the
enable signal returns, the alarm is cancelled and the control relay is energized to restart the motor.
Alarm messages are shown on the display in two different ways with the following meaning:
1 - Alarm with ashing display:
indicates that the device will attempt to restore operation at the end of the AR autoreset
time.
This mode is active only if the AR autoreset time is greater than zero.
2 - Alarm with xed display:
Autoreset disabled, no automatic restart or reset.
An external action by an operator is required to restart.
Possible actions: Turn the device off and on again or deactivate and reactivate the enabling input.
TEMPERATURE ALARM THROUGH PTC
This function involves the use of a thermistor housed near the windings of the motor connected to terminals P1 and P2 of
the device.
The intervention temperature depends on the type of PTC installed in the motor;
The over-temperature alarm is signalled with the symbol t on the display, moreover the device also checks for the presence
of a short circuit on terminals P1 and P2 (Alarm L on the display) or the interruption of the connection with the sensor
(Alarm H on the display ). This alarm is automatically reset if the temperature drops below the set threshold if the AR
autoreset time is greater than zero.
WARNING:
The PTC input is not isolated from the line that powers the motor: use the necessary precautions to prevent
an electric shock.
If you do not want to use this protection, you must set the MODE selector appropriately before
turning on the device.
MAXIMUM CURRENT ALARM
This function involves selecting a current scale between 5A and 16A using the MODE selector before switching on the
device. The over-current alarm is signalled with the symbol A on the display when the current absorbed by the motor
exceeds the percentage threshold set on the device. This alarm is automatically reset when the current drops below the set
threshold if the AR
autoreset time is greater than zero.
During the autoreset time the symbol A ashes and at the end the motor restarts.
N.B.: During normal operation, when the set IMax threshold is exceeded, the symbol A alternates with the symbol O during
the set OT trip time.
POWER FACTOR ALARM
This function has a threshold adjustable between 0 and 1. The power factor alarm is signalled with the symbol P on the
display when the Power Factor drops below the minimum threshold set on the device. This alarm is automatically reset
when the Power Factor returns or exceeds the set threshold if the AR autoreset time is greater than zero. During the
autoreset time the P symbol ashes and at the end the motor starts.
N.B.: During normal operation, when the set PFmin threshold is exceeded, the symbol A alternates with the symbol O
during the set OT trip time.
