User manual

SALIENT FEATURES
MOSFET DRIVE FOR HIGH EFFICIENCY
Rugged power MOSFETs are used in the power stage. These have lower losses than
comparable bipolar transistors, resulting in higher efficiency and also improved
reliability due to lower temperatures. Also, MOSFETs have peak current ratings of
approximately 10 times the average current, which makes them totally immune to
spikes and surges.
ELECTRONIC SHORT CIRCUIT PROTECTION
An electronic circuit monitors the total supply current, and shuts off the voltage drive
to each MOSFET if a predetermined limit is exceeded. This protects the output stage
from direct shorts to either power rail as well as direct shorts across the armature
terminals.
DIFFERENTIAL COMMAND INPUT
This provides high noise immunity, and is essential for proper operation in electrically
noisy environments, and to eliminate switching noise picked up by the tach from
integrated tach-motor packages.
AVERAGE CURRENT LIMITING FOR OVERLOAD PROTECTION
When the average current setting of the drive is exceeded, an analog timer starts.
When the preset time limit is exceeded, the drive current is clamped to the set average
value. This logic completely protects the motor from any overload damage.
VOLTAGE AND TEPMERATURE PROTECTION
The drive monitors logic and power supply voltages, as well as driver heat sink
temperatures and shuts down the drive in the event the preset limits are exceeded.
FAULT OUTPUT
An open collector signal is available as an output from the drive, which can be set to
activate either when the drive is in a normal state, or shut down due to a fault. This
feature allows the signal to be used for driving a relay to be used for controlling a
power fail brake mounted on the motor shaft, if required.
INTEGRATED HEATSINK AND COOLING FAN
An integrated heat sink with cooling fan is provided for reliable operation at high
ambient temperatures. The cooling fan requires an external 220V AC supply.