General Description: The document describes the Pacemaster 4 & 5 adjustable speed DC drives, which are bi-directional regenerative units designed for controlling permanent magnet or wound field DC motors. These drives are suitable for applications with high duty cycles, overhauling loads, or controlled stopping needs. They offer four quadrant speed/torque control and operate on 115/230V, 50/60 Hz, single-phase power.

Standard Features: Key features include encapsulated SCR packs for reliability, burst firing to prevent instability, isolated heatsink, selectable feedback options, two-mode stopping, and protection against automatic restart. Additional features include temperature compensation, contactorless reversing, short circuit protection, transient voltage suppression, and adjustable speed and current limits.

Available Options: Options include dynamic braking, tachometer followers, process followers, linear acceleration/deceleration, and various operator controls for local or remote mounting.

Applications: The drives are used in web control for winders and unwinders, positioning applications requiring high response, and high inertia loads such as centrifuges and conveyors.

Specifications: The drives are designed to comply with National Electrical Code and NEMA standards. They offer a speed range of 30:1 by armature feedback and 100:1 by tach feedback, with speed regulation varying by feedback type. The Pacemaster 4 is available in 1/4 to 2 HP ratings, while the Pacemaster 5 is available in 3 and 5 HP ratings.

Operating Conditions: The drives can handle line voltage variations of ±10% and line frequency variations of ±2 Hz. They operate in ambient temperatures of 0-55°C for chassis models and 0-40°C for enclosed models, with a relative humidity range of 5-95% without condensation.

Performance Characteristics: The drives offer fixed acceleration and deceleration, with optional linear accel/decel. They have a service factor of 1.0 and continuous duty rating, with a maximum load capacity of 150% for 1 minute.

Adjustments: The document provides details on horsepower adjustments, maximum and minimum speed settings, current limits, IR compensation, stability, and tachometer calibration.

Dimensions and Weight: The mini-chassis controller has specific mounting dimensions and weighs 24 lbs.