A.M.I. PH001 Buku Petunjuk - Halaman 3

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Phase rotation :

As soon as the power is turned on and during the entire operating period, the system checks the

presence and direction of phase rotation.

- If the detected direction is anti-clockwise (known as reverse rotation): the relay will be immediately

deactivated in order to prevent incorrect rotation of the motors. The display of LEDs 1/2/3 will be in

running light eﬀ ect, LED 4 will be red steady. The relay will only be activated after checking the correct

rotation and after carrying out the other checks.

- If the detected direction is clockwise : the rest of the complete control cycle will be carried out.

The output relay will only be activated when the entire control cycle remains correct.

Status

PH1

PH2

PH3

Status

with correct

with reverse rotation display

rotation

will be in running ligh eﬀ ect

on PH1, PH2, PH3. The relay

is instantly deactivated.

ADDITIONAL CHECK WHEN ROTATION IS CORRECT :

Undervoltage detection (300V to 380V) :

As soon as the phase rotation is correct, the voltage on each phase is

L3 Status

compared with the setpoint displayed on the Umin front potentiometer.

If a phase has a voltage lower than this setpoint:

PH1

- The corresponding LED will be displayed by blinking slowly.

PH2

- LED 4 will be displayed in RED, blinking slowly.

PH3

If the fault is still present and after the end of the time delay, the output relay

Status

will be deactivated and LED 4 will turn RED steady.

Overvoltage detection (380V to 480V) :

The voltage on each phase is compared with the setpoint displayed on the

L3 Status

Umax front potentiometer.

PH1

If a phase has a voltage higher than this setpoint :

- The corresponding LED will be display by rapid blinking.

PH2

- LED 4 will be displayed in RED, blinking slowly.

PH3

If the fault is still present and after the end of the time delay, the output

Status

relay will be deactivated and LED 4 will turn red steady.

If the voltage exceeds 10% of the Umax setting value, the relay will be deactivated immediately.

If the voltage of a phase is between the «undervoltage» setpoint and the «overvoltage» setpoint, the corresponding LED will be

displayed steady. (LED 1 and LED 3 in the example). As a result, it is possible to see a display with the 3 states on the LEDs 1,2,3,

namely: one LED steady, one LED blinking slowly and one LED blinking fast.

Loss of neutral / phase asymmetry (5% to 25%) :

Risks such as undervoltage and overvoltage can cause destruction of the equipment.

The PH001 makes it possible to constantly check that the voltages remain within

acceptable limits. But while remaining within the minimum / maximum limits, the

voltage of one phase can become too high and another too low. This can be caused by:

- loss of neutral in «Three-phase + neutral» mode : Neutral allows the same

Phase / neutral voltage to be maintained whatever the consumption, even unbalanced.

In the event of neutral cut-oﬀ and if the installation remains balanced, the phase / neutral

voltage remains stable. But in the event of loss of neutral and unbalanced installation,

the neutral seen by the user is re-supplied through the other consumers present. In

this case, the voltage of one phase relative to the neutral decreases while the voltage

of another phase increases relative to neutral. This situation can be detrimental or even

destructive for single-phase consumers. The loss of the neutral is only prejudicial from

the moment when the single-phase voltage becomes abnormal (outside the deﬁ ned

thresholds).

- Phase loss : the loss of a phase is diﬃ cult to detect because the other consumers

present return a voltage by induction or by voltage return on the missing phase.

As a result, the voltage of the missing phase is not zero.

In any case, the damage is caused by the voltage diﬀ erence between each of the phases.

- The PH001 controls the voltage diﬀ erence between each of the phases compared to an internal dummy neutral.

This voltage diﬀ erence must remain below the setpoint displayed on the «Asymmetry» front potentiometer.

When all the phase voltages are correct, (i.e. between the under and overvoltage

thresholds), the PH001 compares the voltage of each phase with respect to the

L3 Status

others in %. If the voltage of one phase compared to another, goes outside the

limits deﬁ ned in «asymmetry» : LED 4 will be displayed in yellow, blinking slowly.

PH1

If the fault is still present and after the end of the time delay, the output relay

PH2

will be deactivated and LED 4 will turn yellow steady.

PH3

Note that a general voltage drop over the three phases (following a three-phase

Status

start-up by a large consumer) will have no impact as long as this drop remains

within the limits of the undervoltage setting.

In addition, if the voltage of one of the phases goes beyond the under or overvoltage limits,

the corresponding LED (L1, L2 or L3) will be displayed blinking slowly or fast.

Instant trigger :

The output relay is deactivated instantly in the event of :

- loss of phase rotation.

- exceeding the overvoltage setting by more than 10%.

- exceeding the maximum of the asymmetry / loss of neutral,

i.e. +25%.

- voltage higher than 277v PH/N or 480v PH/PH.

Status

PH1

PH2

PH3

LEDs 1/2/3

LED 4

LED4

Status

ETAT

RELAIS

RELAY

Display on the PH001 DIN box inside the cabinet

In the following cases, phase 2 is taken as an example,

but this remains valid for phase 1 and 3.

PH1

PH2

PH3

PH1

PH2

PH3

Time delay (0,5s to 60s) :

The output delay is deactivated after a delay in the event of :

- exceeding the overvoltage / under voltage setting

between 0 and 10%.

- exceeding the asymmetry setting or loss of neutral less than

25%.

Anticlockwise

Clockwise

Setting

Umin

LED PH2 /L2

LED 4

Status

Delay

RELAY

Setting

Umax

LED PH2/L2

LED 4

Status

Delay

Relay

380V PH/PH

220V PH/PH

1kVA

5kVA

1kVA

220V

63V

380V

Loss of neutral, unbalanced power grid

Cas de perte de NEUTRE, réseau non équilibré

380V PH/PH

?V PH/PH

1kVA

5kVA

1kVA

380V

63V

Cas de la perte d'une PHASE

Loss of phase

Setting

PH1

PH2

PH3

LED 4

Status

Delay

Relay

+10%

Umax

Delay

? PH/N

5kVA

316V

5kVA

316V