Electric Motor Control Basics - Book - Page 13
Industrial Control Basics: Part 1, Contactors
Industrial Control
Basics:
Part 1, Contactors
IEC UTILIZATION CATEGORIES (continued)
LOW VOLTAGE UTILIZATION CATEGORIES
NATURE OF
CURRENT
CATEGORY
TYPICAL APPLICATIONS
d.c.
DC-1
DC-3
DC-5
DC-6
Non-inductive or slightly inductive loads, resistance furnaces.
Shunt-motors, starting, plugging1, inching2, dynamic breaking of motors.
Series-motors, starting, plugging1, inching2, dynamic breaking of motors.
Switching of incandescent lamps.
DC-12
DC-13
DC-14
Control of resistive loads and solid-state loads with isolation by optocouplers.
Control of d.c. electromagnets.
Control of d.c. electromagnetic loads having economy resistors in circuit.
DC-20
DC-21
DC-22
DC-23
1
2
Connecting and disconnecting under no-load conditions.
Switching of resistive loads, including moderate overloads.
Switching of mixed resistive and inductive loads, including moderate overloads,
(e.g. shunt motors).
Switching of highly inductive loads, (e.g. series motors).
RELEVANT
IEC PRODUCT
STANDARD
60947-4
Industrial Control
Basics: Part 2,
Overload Relays
60947-5
Industrial Control
Basics: Part 3,
Starters
60947-3
By plugging is understood stopping or reversing the motor rapidly by reversing motor primary connections while the motor is running.
By inching (jogging) is understood energizing a motor once or repeatedly for short periods to obtain small movements of the driven mechanis
The Benefits of Type E/F
Motor Protection
Circuit Breakers
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
Application
NEMA vs IEC Motor
Controls
Understanding
IP Ratings
13
