PR3-E-27kW

SKU: A437409-HV Category:

Three Phase – Enclosed

£300.72 ex. VAT

Quantity discounts
1-4 5-9 10-19 20+
£300.72 £285.68 £271.40 £257.87

Description

The PR3 range of thyristor stacks provides full seamless control of three phase resistive loads, using two thirds control technique. Signal control is by a dc signal or manual control via a 5kΩ potentiometer. These burst firing control stacks use fast pulse zero volts switching technology, to minimise flicker and eliminate RFI problems. They also incorporate an automatic resetting temperature trip, integral semiconductor fuses and heatsink. The three models in this build includes the 27kW model, which is forced-air cooled.

APPLICATIONS
Suitable for 3-wire, 3-phase floating-star or closed-delta configured resistive loads. This includes the Heating, Ventilating and Air Conditioning (HVAC) market for air curtain applications, but also for furnaces, ovens, dryers and hot plates.

FUNCTIONS
Alarm relay functions (3-way terminal – V/free alarm “NO_NC_C”)
The alarm circuit has voltage free relay contacts and are rated up to 2A @ 125V ac (RMS) load.
The internal supply to the relay is obtained from the transformer via two 20mm 1A fuses. These are connected to the L1 and L2 phases and therefore the relay and LED can only energise when there is an over-temperature condition, a sensor fault, or a L3 phase loss

Over temperature protection
When a heatsink temperature of above 90ºC is detected by the sensor, the alarms relay changes state and the LED pulses rapidly. The power to the load will be disconnected and will not return until the temperature drops to 85ºC

Temperature sensor loss
LED status changes to ON/OFF (fast pulsing) if the sensor fails.

When any one of the three phase inputs are missing, the relay changes state and the LED flashes with ON/OFF bursts of 1.5 seconds. This is only functional with a remote supply

Fault condition
The default setting of DIL switch (SW1) is in the ON position, the alarm relay will be energised under a fault condition. Changing SW1 to the off position will energise the alarm relay continuously until a fault condition occurs

Remote supply
The unit will be factory set for an internal supply (SUPPLY Switch SW3 in the “INT” position). If there is a requirement for the alarm relay and LED to energise when a phase fault condition occurs, then there is provision for an external 24V ac or dc supply (SUPPLY switch SW3 in the “EXT” position).

Additional information

Download the technical document for this product below.


Download Technical Datasheet
Weight 2.797 kg
Technical Support

Other Products Bought With This

Need Help Deciding?

If you are unsure which item to purchase or would like additional information then please get in touch.

+44(0)1704 516500

Recently Viewed Items

No products recently viewed

Product Design / Prototyping

We have developed a systematic approach to designing and prototyping your product from start to finish.

We Have Been Manufacturing Since 1964

A global leader in Power Control Products for over half a century. We’re proud to have achieved this with support of an amazing team.

the-team

Our Accreditations