Pixsys DRR244 DIN Rail PID Controller, 2 Loops, CT Input

DRR244 is a DIN rail PID controller from the Pixsys Blue Line with a 72 x 90 mm front and extractable terminal blocks. The datasheet lists one or two configurable analogue inputs, two or four digital inputs, two or three relays, two SSR drives, a volt/mA analogue output, a current transformer input for heater monitoring and an RS485 Modbus RTU port.

Two control loops and a heater-break input on one rail-mounted unit

Most of the parameter groups in the manual are duplicated for regulation loop 1 and loop 2, with separate tuning parameters (73 tun.1 and 98 tun.2) and separate Modbus words (1216 and 1217) to launch tuning. That means one DRR244 can run two heating zones, or a heating and a second independent loop, from the same terminal block. The unit also offers five alarm blocks and two timers that can be started or stopped by a digital input.

The current transformer input (50 mA, 4096 points) supports the heater break alarm described in the manual: you enter the line frequency, the transformer value and a threshold in amperes, and the controller reports a shorted element, an open load or a partial load loss after the set delay. An overcurrent threshold can be set as well, and the average current can be shown on display 2 even when the alarm is disabled.

Datasheet highlights

• Inputs: thermocouples K, S, R, J, T, N, B, RTD, thermistor, 0-10 V, 0/4-20 mA, 0-60 mV, potentiometer 1 to 150 kΩ, plus CT input.
• Dynamic smart tune and loop-break alarm with current transformer.
• Analogue output 4-20 mA or 0-10 V for command or retransmission of process or setpoint.
• Digital input functions: setpoint switching, hold, run, start/stop, tuning, lock configuration.
• Open/close logic for motorized valves, heating/cooling double PID, soft-start by gradient or output percentage.

Technical specification

Electrical data

Mechanical

Selecting the DRR244 code

The datasheet gives the code DRR244-13ABC-T. The datasheet describes the family range as 1/2 analogue inputs, 2/4 digital inputs, 2/3 relays and 1/2 analogue outputs, but prints only this one code, which has one analogue input, three relays, two SSR drives, two digital inputs and one analogue output. Between the datasheet and the manual the supply range and the Q2 relay rating differ, so confirm both on the unit label.

Compared with the DRR224, the DRR244 adds the CT input, the analogue output, five alarms, timers and the serial port. If you only need a single loop with one DI and no monitoring, the DRR224 is simpler.

Tuning and commissioning notes

Automatic tuning is selected per loop. Manual tuning calculates the PID values from a step test and can be started from the keypad, from a digital input configured as tune, or by writing 1 to the Modbus tuning word. The tune threshold is the setpoint minus the set deviation tune, so for better accuracy start it when the process is away from the setpoint. With the soft-start function enabled, tuning cannot be activated.

For extruder-type loads the manual shows the en.sto. mode of automatic/manual control: after a power cut or a sensor break the controller keeps the last PID output percentage in manual mode rather than going to zero.

Applications

Multi-zone heating on extruders, hot-runner and sealing machines, ovens and test benches, where heater current monitoring avoids silent loss of an element. The rail-mount case sits in the cabinet, away from the operator panel; keep the 0 to 45 °C limit in mind for cabinets in hot plant rooms.

Related items

Memory card USB (code 2100.30.013), BT-NFC (code 2000.35.099) and the CNV580 gateway, which the manual shows wired to a DRR244-13ABC-T for remote monitoring.

Frequently asked questions

Does DRR244 control two loops?

The manual provides separate parameters, tuning and Modbus words for regulation loop 1 and loop 2.

What does the CT input do?

It reads a 50 mA current transformer for the heater break alarm and optional overcurrent threshold; average current can be shown on display 2.

Which outputs are available?

Relays, SSR drives and a 4-20 mA or 0-10 V analogue output that can carry command or retransmitted values.

Is serial communication included?

Yes, in the -T code: RS485 Modbus RTU as slave.

Does Seven Star LLC act as a Pixsys distributor?

No. Seven Star LLC is not a Pixsys distributor; it is an independent Muscat-based supplier that quotes Pixsys products on request.

Documents and quotation

The official Pixsys datasheet and user manual for DRR244 are hosted on this page for download. Seven Star LLC is an independent supplier in Muscat; send your quantity and delivery location through the quotation form and we will quote this item. Please confirm the exact order code, supply voltage and output options against the documents before ordering. More related products: product category.