LOVATO ELECTRIC PMA30 (01) PDF Document

Before installing or using the LOVATO ELECTRIC PMA30, it is crucial to follow these safety and installation guidelines:

• Carefully read the manual before installation or use.

• This equipment must be installed by qualified personnel, complying with current standards, to avoid damages or safety hazards.

• The manufacturer is not responsible for electrical safety in case of improper use of the equipment.

• A circuit breaker must be included in the electrical installation of the building. It must be installed close to the equipment, be within easy reach of the operator, and be marked as the disconnecting device of the equipment (IEC/EN 61010-1 § 6.11.2).

• Fit the device in an enclosure or cabinet with a minimum IP40 degree of protection.

• Technical data and descriptions are subject to change without prior notice.

Clean the LOVATO ELECTRIC PMA30 equipment with a soft cloth. Do not use abrasive products, liquid detergents, or solvents.

The LOVATO ELECTRIC PMA30 is a control relay designed for monitoring alternating (AC) or unidirectional direct current (DC). It features minimum or maximum current tripping functions. It has a wide auxiliary supply voltage range of 24…240VAC/DC. The current input can be connected directly to the circuit or via a Current Transformer (CT) to control a circuit with a maximum voltage of 415VAC.

The LOVATO ELECTRIC PMA30 has the following characteristics:

• Protection relay for minimum or maximum current.

• Supply voltage of 24…240VAC/DC.

• True RMS (TRMS) AC/DC measurements.

• Connection can be made either directly or by an external Current Transformer (CT).

• Features automatic or manual reset.

• Configurable end-scale value of 5A or 16A.

• Output relay with a changeover contact, configurable as Normally Open (NO) or Normally Closed (NC).

• Configurable input for reset or inhibition functions.

• Minimum or maximum current threshold adjustment from 5 to 100%.

• Adjustable hysteresis from 1 to 50%.

• Inhibition time from 1 to 60 seconds.

• Tripping delay from 0.1 to 30 seconds.

• One green LED indicator for power supply and inhibition time status.

• One red LED indicator for current tripping status.

To select an operating mode, regulate the rotary switch [5] to the required mode setting. It is recommended to make the operating mode choice when the device is switched off to avoid dangerous conditions. However, it is possible to change the mode while the device is powered.

When changing the mode on a powered device, the adjustment of the rotary switch will cause all LEDs to flash simultaneously for 5 seconds. After this, the device will reset and power up with the new operating mode.

The LOVATO ELECTRIC PMA30 has several operating modes, which can be selected using the rotary switch [5]. The modes determine the function (minimum or maximum current), the default relay state, and the latch (memory) function.

The relay state determines the default condition of the output relay:

• RELAY OFF: The output relay is normally de-energised.

• RELAY ON: The output relay is normally energised.

The Latch mode determines how the device resets after a trip event:

• LATCH OFF (With no tripping memory): In this mode, resetting occurs automatically. For maximum current, the device resets when the current value decreases below the hysteresis value. For minimum current, it resets when the current increases above the hysteresis value. If powered, input Y inhibits the unit’s operation.

• LATCH ON (With tripping memory): In this mode, the trip is latched (memorized). Resetting can only be obtained if the current has returned within the set limits AND a reset signal is given. A reset is performed by powering input Y after a trip, or by removing power from the relay. If input Y is maintained closed, the unit automatically resets without the inhibition time.

Follow these guidelines for connecting the LOVATO ELECTRIC PMA30:

• The current signal is obtained on terminals B1 and C (-).

• The current input can be made by means of an external Current Transformer (CT) for AC only, or connected directly for AC/DC measurements.

• For direct connection, the voltage at the terminals must not be greater than 415VAC/DC. If DC measurement is used, the polarity must be respected.

• The auxiliary power supply is connected to terminals A1 and A2.

• The Y input is used for the reset or inhibition function, depending on the selected operating mode.

The normal operation sequence after powering on the device is as follows:

1. At power on, the PMA30 enters the inhibition time set by potentiometer [4]. During this time, the green LED flashes.

2. After the inhibition time has lapsed and with normal operating conditions (current is within the setpoint defined by potentiometer [1]), the green “ON” LED switches on constantly, the red LED is off, and the output relay is in its normal state (energised or de-energised based on the selected function).

3. When the current value increases above or decreases below the set value (depending on the function), the red LED flashes, indicating a fault condition is detected.

4. After the tripping delay time (set by potentiometer [2]) has lapsed, the relay changes state and the red LED remains constantly on, indicating a trip.

5. The resetting mode depends on the “Latch” function selected (automatic for Latch OFF, manual for Latch ON).

The LOVATO ELECTRIC PMA30 has the following certifications and complies with the listed standards:

• Certifications obtained: cULus, GOST

• UL Marking: Use 60°/75° CU wire only. AWG 12-18 Stranded-solid. Torque 7-9lbin.

• Reference standards: IEC/EN 60255-5, IEC/EN 61010-1, IEC/EN 61000-6-2, IEC/EN 61000-6-3, IEC/EN 60068-2-6, IEC/EN 60068-2-27, IEC/EN 60028-2-61, UL 508, CSA C22.2 N° 14.