Product Description

Sprint Electric

PL/XD Series

DC Control

Used for controlling external 3-phase thyristor stacks for DC motors and slip-ring motors.


A digital stack controller built from the classic PL/X platform. The PL/XD is used for controlling external 3-phase thyristor stacks for DC motors and slip-ring motors. It possesses the same functionality as the PL/X range, except that the output power stage is not included. The PL/XD makes an extremely economical solution for users of very large power DC motors wishing to separate the control and power modules.

The PL/XD provides the same functionality as the integrated PL/X drive, except without the power stage. The PL/XD uses the same frame size as the PL/X 5 - 50 model and hence is extremely compact. The PL/XD provides all the world-class control features of the PL/X series. The PL/XD can control a 6 pulse 2Q bridge (6 thyristors), 2 bridges in parallel (12 thyristors) or a 6 pulse 4Q regenerative anti-parallel bridge (12 thyristors).



State-of-the-art Digital Control

The PL/XD provides gate drive pulse for driving user supplied pulse transformers with primary pulse current up to 1.5A. The PL/XD can be supplied with supply voltages up to 690VAC as standard. There is also an integral motor field bridge with independent single-phase AC supply inputs for controlling fields up to 32A or 50A. Internal field supply input voltage is set at 480VAC.

Powerful Ethernet

The PL/XD can be fully equipped with Drive.Web to enable the Industrial Internet Of Things (IIOT). Drive.Web distributed control technology uses Ethernet and powerful graphical tools to provide robust Programmable Peer Control (PPC) for drives and systems. Options for field bus systems include Ethernet, Profibus, CANbus, Modbus, DeviceNet and many more. The PL/XD is CE approved.



Fully controlled variable field supply

Armature Voltage

V armature = Vac x 1.2

Field Voltage

V field = 0 to 0.9 x Auxiliary AC Supply

AC Supply Voltage (VAC)

EL1 / EL2 / EL3 Synchronisation 3 phase 50-60Hz:

12 to 690Vac +/- 10%

EF2 / EF3 1 phase 50-60Hz:

100 to 500Vac +/- 10% for field power

Control 1 phase 50-60Hz:

110 to 240Vac +/- 10 for control power


Instantaneous over-current

Field failure and over-current

Motor over-temperature over-temperature

Mains supply phase loss

Mains synchronisation loss - Armature over-volts

Speed feedback failure

Stall protection

Standstill logic

Thyristor 'trigger' failure

Digital output short circuit

Analogue Inputs

8 total (resolution 2.5mV+sign)

All configurable

All have programmable thresholds and 4 voltage ranges

+/- 5/10/20/30V

All inputs are over voltage protected and can also be utilised as digital inputs

Analogue Outputs

4 total (resolution 2.5mV+sign)

1 armature current output

3 configurable

All outputs are short circuit protected

Digital Inputs

17 total

All configurable

Digital Outputs

7 total (24V logic 350mA total)

Short circuit protected

Over temp and

over voltage protected

All configurable

Standard Software Functions

Full suite of centre winding macros

Motorised pot simulator with memory

2x PIDs (undedicated)

2x Summers (undedicated) - 2x Filters (undedicated)

Delay timer

Current Profiling

Spindle Orientation

Jog/Crawl functions

Dual motor swap


Linear or S ramp

Slack take up

Batch counter

Draw control

Auto self-tune current loop - 3 user programmable drive configurations

Alarm Status

First fault latched and automatically displayed.

Fault automatically saved at power off


All analogue input voltages

All digital input states

All analogue output voltages

All digital output states

Tachogenerator voltage

Motor armature current (amps)

Motor field current (amps)

Motor armature volts

Output power

AC supply volts

Field Configurations

Fixed current

Fixed voltage

Field weakening

Delayed quenching - Standby field value - Field economy


Ambient operating temperature

0-40°C (2050A 2250A 35°C) - 25 to +55°C storage

Steady State Accuracy

0.01% Encoder feedback with digital reference.

0.1% Analogue tachogenerator feedback

2% Armature voltage feedback

0.01% Encoder + tach, encoder + AVF or encoder only feedback

Maximum encoder frequency 100KHz


CE marked to EN50178 (low voltage directive)


Immunity industrial environment

EN50082-1:1997 Immunity residential commercial and light industry

EN50081-2:1993 Emissions industrial environment (EN55011 Class A)

EN50081-1:1992 Emissions industrial environment (EN55022 Class B)

UL and cUL listed 12-630Amps

UL and cUL pending 650-2250Amps

Speed Feedback

Analogue tach


Armature voltage

Encoder + Armature volts

Encoder + Analogue


Rs232 as standard

Profibus available

DeviceNet available

CC-link available

EtherNet/IP available

Modbus available

CANopen available

drive.web Ethernet available


Need more information?We can help.