Four quadrant control of DC Motors
Model 2745D-5 Digital
Model 2745A-5 Analog
Isolated Input

 

• 10 Bit digitial input, or
• ±5 VDC analog input
• 1500 volt isolation (minimum)
• Extremely rugged
• Completely failsafe
• Static direction switching control
• Controlled motor output up to 5 HP

DESCRIPTION:

WR-UPS Model 2745-5 motor controls are full wave, full regenerative (four quadrant) modules that control the speed and direction of motor torque for shunt wound or permanent magnet DC motors. These exceptionally rugged controls are available for either digital or analog isolated inputs, and feature fully static (solid state) switching and thyristor phase angle control, for applications of up to 5 horsepower.

These motor controls are available in open frame construction suitable for OEM use in user provided enclosures. Power connections are made with a heavy duty barrier block. A field removable barrier block is provided for signal connections. Holes are provided for bottom mounting.

Model 2745-5 controls operate on 208 or 230 VAC lines at 50 Hz or 60 Hz. A power line fuse is incorporated on the mounting base plate. These controls operate in conjunction with an auxiliary transformer to drive motors with an armature rating of 180 VDC. A field voltage supply producing either 100 or 200 VDC is also incorporated for shunt field motors.

OPTIONS

Model p/n 2745-06 plug-in adjustable accel/decel board permits control of clockwise and counterclockwise acceleration and deceleration with four independent adjustments.

DIGITAL INPUT: Model 2745D-5
for applications up to 5 horsepower

These controls are easily interfaced to either microprocessors or 10-bit parallel TTL logic level sources. Motor speed and direction are determined by the value of a 10-bit parallel input: one bit for direction and 9 bits for motor speed. Unused bits in lower resolution applications may be tied off. Logic input signals are isolated from the motor and power line with a minimum isolation voltage of 1500 VDC, reducing the possibility of grounding, noise or safety problems. In addition, a failsafe circuit de-energizes the motor if the input control power is not present. Use Model 2745D, 2745DL or 2745D-3 for applications from 1/8 to 3 HP (see separate data sheets).

ANALOG INPUT: Model 2745A-5
for applications up to 5 horsepower

These controls are easily interfaced to low level analog circuitry. Motor speed and direction are determined by amplitude and polarity (5 volts full scale) of the input signal. Input signals are isolated from the motor and power line with a minimum isolation voltage of 1500 VDC. This reduces the possibility of grounding, noise or safety problems. In addition, a failsafe circuit de-energizes the motor if the input control power is not present. Use Model 2745A, 2745AL or 2745A-3 for applications from 1/8 to 3 HP (see separate data sheets).