This manual links to KnowledgeBase Article SMC Flex Soft Starter
Parameters, which contains the parameters; download the spreadsheets
now to ensure offline access.
SMC Flex Soft Starters
Bulletin 150-F
User Manual
Original Instructions
SMC Flex Soft Starters User Manual
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use
or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may
lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or
economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
Labels may also be on or inside the equipment to provide specific precautions.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may
be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach
dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc
Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements
for safe work practices and for Personal Protective Equipment (PPE).
2Rockwell Automation Publication 150-UM008I-EN-P - October 2020
6Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Preface
About This Publication
Ter mi no logy
This user manual provides you with the information that is required to
program and operate your SMC™ Flex soft starter.
The SMC Flex controller is modular so that it can help simplify installation and
commissioning. A built-in LCD display, keypad, and flexible communications
provide optimized configuration, advanced performance, diagnostics, and
protection. Three-phase control, electronic overload, and integrated bypass
along with removable control module, power modules, and fan assembly are
combined in a cost-effective package for your demanding applications.
The user manual assumes that the installer is a qualified person with previous
experience and basic understanding of electrical terminology, configuration
procedures, required equipment, and safety precautions.
For safety of maintenance personnel and others who might be exposed to
electrical hazards associated with maintenance activities, follow all local
safety-related work practices (such as NFPA70E, Part II in the United States).
Maintenance personnel must be trained in the safety practices, procedures,
and requirements that pertain to their respective job assignments.
Throughout this publication, we also refer to the SMC Flex soft starter as the
SMC Flex controller. These terms are interchangeable.
View Parameters
Parameter definitions are listed in Excel® spreadsheets in KnowledgeBase. The
spreadsheets let you filter and sort parameters, and add your own setting
values and notes. Table 1
summarizes the information that is in the
spreadsheet.
Knowledgebase Answer ID 1125564, SMC Flex Soft Starter Parameters,
contains the parameters. Download the spreadsheet from this public
article.
You may be asked to log in to your Rockwell Automation web account or
create an account if you do not have one. You do not need a support
contract to access the article.
Table 1 - SMC Flex Parameter Categories
Parameter GroupDescription
Full Parameter ListFull list of all SMC Flex Controller Parameters
Logic Mask RequirementsLists the Logic Mask Codes and Binary equivalents
Parameter Special Behavior
Describes codes that can appear under specific conditions and parameter
configurations
Rockwell Automation Publication 150-UM008I-EN-P - October 20207
Preface
Summary of Changes
This publication contains the following new or updated information. This list
includes substantive updates only and is not intended to reflect all changes.
Translated versions are not always available for each revision.
Top ic Page
Reformatted pagesThroughout
Added information about conducted emissions compliance for EMC directive35
Added parameter list for control module
Added enumerated binary bit pattern for the Logic Mask parameter99
Removed Parameter List appendix. This information is contained in the spreadsheet that is attached to this
document.
Removed specifications and accessory appendices. This information is contained in the technical data,
publication 150-TD009
.
parameter
spreadsheet
8Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Product Overview
Chapter 1
Description
The SMC™ Flex controller is modular so that it can help simplify installation
and commissioning. A built-in LCD display, keypad, and flexible
communications provide optimized configuration, advanced performance,
diagnostics, and protection. SMC Flex controllers combine three-phase
control, electronic overload, and integrated bypass along with removable
control module, power modules, and fan assembly in a cost-effective package
for your demanding applications.
•Modular for simplified installation and maintenance
•Built-in LCD and keypad or personal computer software setup
•Integrated bypass
•Nine start/stop modes and three slow-speed modes
•Full metering and diagnostics
Modes of operation include the following:
•Soft start•Full-voltage Start
•Current Limit Start•Dual Ramp Start
•Selectable Kickstart•Pump Start
•Coast-to-rest•Preset Slow Speed
•Soft stop•Pump Stop
•Smart Motor Braking (SMB™)•Accu-Stop™
•Slow Speed with Braking
•Linear Speed Acceleration
(Tachometer required)
Operation
IMPORTANT
The SMC Flex controller can operate standard squirrel-cage induction motors
rated 1…1250 A or Star-delta (wye-delta) type motors rated 1.8…1600 A up to
690V AC, 50/60 Hz. Depending upon the controller type ordered, the control
power input can range from 100…240V AC or 24V AC/DC. Verify voltage on the
product before you apply power.
Rockwell Automation Publication 150-UM008I-EN-P - October 20209
The three controller options are Standard Control, Pump Control, and
Brake Control. Some modes of operation are only available on certain
controllers, such as Smart Motor Braking on Brake Control. Consider the
available modes of operation for a controller when configuring a catalog
number to order. You can upgrade an existing controller to another
control option by replacing the control module. Consult your local
Rockwell Automation sales office or Allen-Bradley distributor.
Chapter 1 Product Overview
Time (seconds)
Ramp Time
Start
Run
% Voltage
Initial
Tor que
100%
Starting Modes
The SMC Flex Smart Motor Controller provides the following starting modes
of operation as standard:
Starting Modes
Soft StartPump Control Mode
Linear Speed AccelerationDual Ramp Start
Current Limit StartFull-voltage Start
Selectable KickstartPreset Slow Speed
Soft Start
Soft Start limits the current throughout the soft start, and covers the largest
number of general applications. The motor is given an initial torque setting.
From the initial torque level, the output voltage to the motor is steplessly
increased (ramped) during the acceleration ramp time. Initial torque setting
and acceleration ramp time are user adjustable.
A motor’s torque curve is not a linear function and depends on both applied
voltage and current. If the soft starter ramped voltage that is applied to the
motor is sufficient for it to develop enough torque to overcome the inertia of the
load, the motor could quickly accelerate to full speed in less than the configured
ramp time when using the Soft Start mode.
Figure 1 - Soft Start Timing Diagram
Linear Speed Acceleration
With this type of starting mode, the motor acceleration is at a constant rate.
The controller accelerates the motor in a linear fashion from the off (0 speed)
condition to full speed condition in the time configured in the user-defined
ramp time (0…30 seconds). Kickstart is available with this option.
A tachometer input (0…5V DC) is required to perform this start mode.
Linear Speed Acceleration presents the least amount of stress on mechanical
components. An initial torque value is configured to define a motor starting
10Rockwell Automation Publication 150-UM008I-EN-P - October 2020
value.
Chapter 1 Product Overview
% Speed
Ramp Time
100%
Time (seconds)
StartRun
Stop
Stop Time
Linear AccelerationLinear Deceleration
% Full Load Current
50%
600%
Current Limit
Time (seconds)
Start
Figure 2 - Linear Speed Acceleration Timing Diagram
Current Limit Start
Current Limit Start provides a current limit-controlled start by maintaining a
constant current to the motor. Use this method when it is necessary to limit
the maximum starting current. You can adjust the starting current and
current limit starting ramp time.
Figure 3 - Current Limit Start Timing Diagram
Selectable Kickstart
The kickstart feature provides a boost at startup to break away loads that can
require a pulse of current/torque to get started. It is intended to provide a
current/voltage pulse for a short time. Kickstart is available in Soft Start,
Current Limit, Linear Speed Acceleration, and Pump Control modes.
Rockwell Automation Publication 150-UM008I-EN-P - October 202011
Chapter 1 Product Overview
% Voltage
Initial
Tor que
100%
Kickstart
Time
Time (seconds)
Start
Run
Kickstart
Level
Soft stop
Soft stop
Coast-to-Rest
100%
Time (seconds)
Run
Motor Speed
Pump Start
Ramp Time
Pump Stop
Stop Time
Figure 4 - Selectable Kickstart Timing Diagram
Pump Control Mode
Use Pump Control Mode to reduce surges in a fluid piping system and the
resulting fluid hammer or check valve slam that is caused by starting or
stopping a centrifugal pump at full voltage and full speed. This mode increases
pump life by reducing pump cavitations. To provide these benefits, the
microprocessor of the SMC Flex controller generates a motor start curve that
follows the starting characteristics of a centrifugal pump and monitors
operation during start to deliver reliable pump starts.
Figure 5 - Pump Control Mode Timing Diagram
Dual Ramp Start
Dual Ramp Start is useful on applications with variable loads, starting torque,
and start time requirements. Dual Ramp Start gives you the ability to select
between two separate start profiles via any programmable auxiliary input.
Each start profile can use any of the available starting modes.
12Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Chapter 1 Product Overview
% Voltage
Time (seconds)
Current Limit 2
Current Limit 1
100%
Initial
Torque 2
Initial
Torque 1
Ramp Time 2
Ramp Time 1
Start 1
Run 1
Start 2
Run 2
100%
Time (seconds)
% Voltage
Figure 6 - Dual Ramp Start Timing Diagram
Full-voltage Start
Full-voltage Start is used in applications that require across-the-line starting.
The SMC Flex controller performs like a solid-state across-the-line contactor.
Full inrush current and locked-rotor torque are realized. You can program the
SMC Flex controller to provide a full-voltage start in which the output voltage
to the motor reaches full voltage in 250 ms.
Figure 7 - Full-voltage Start Timing Diagram
Preset Slow Speed
Use Preset Slow Speed on applications that require slow speed moves for
positioning material. You can set the Preset Slow Speed at either 7% (low) or
15% (high) in the forward direction. You can program reverse speed and 10%
(low) or 20% (high) of the base speed setting. No reversing contacts are
required. To help achieve more-accurate stops, braking is also a part of this
function. You can program two independent preset slow speed parameters for
both speed and direction.
Rockwell Automation Publication 150-UM008I-EN-P - October 202013
Chapter 1 Product Overview
Motor Speed
100%
15% - High
Time (seconds)
Start
Run
Forward
Reverse
7% - Low
20% - High
10% - Low
% Voltage
100%
Time (seconds)
Stop Time
RunSoft stop
Coast-to-Rest
Figure 8 - Preset Slow Speed Timing Diagram
Stopping Modes
The SMC Flex Smart Motor Controller provides the following Stopping Modes
of operation as standard:
Stopping Modes
CoastLinear Speed Deceleration
Soft stopPump Stop
Coast
Configure the stop mode to Coast sets the controller to perform a motor coastto-stop maneuver.
Figure 9 - Coast-to-stop Timing Diagram
14Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Chapter 1 Product Overview
% Voltage
100%
Time (seconds)
Stop Time
Run
Soft stop
% Speed
Ramp Time
100%
Time (seconds)
StartRun
Stop
Stop Time
Linear AccelerationLinear Deceleration
Soft Stop
(a)
The soft stop mode can be used in applications that require an extended stop
time. You can adjust the voltage ramp down time from 0...120 seconds. The
load stops when the programmed stop time has elapsed or the voltage ramp
drops to a point where the load torque is greater than the motor torque.
Figure 10 - Soft Stop Timing Diagram
Linear Speed Deceleration
(a)
Configuring the motor stop mode to Linear Speed Deceleration mode
commands the motor to stop from full speed to zero speed following a linear
ramp based on the user-configured stop time. This stopping mode requires a
tachometer input (0…5V DC).
You do not need to set up Linear Stop even if you have programmed a linear
start. The Linear Stop cannot brake the motor/load and reduce the stopping
time.
Figure 11 - Linear Speed Deceleration Timing Diagram
(a) Not intended to be used as an emergency stop. Consult the applicable standards for emergency stop requirements.
Rockwell Automation Publication 150-UM008I-EN-P - October 202015
Chapter 1 Product Overview
100%
Time (seconds)
Run
Motor Speed
Pump Start
Ramp Time
Pump Stop
Stop Time
Pump Stop
(a)
Just as starting a centrifugal pump at full voltage causes fluid hammer and
check valve slam, stopping a centrifugal pump that is running at full speed can
also produce the same results. The Pump Stop mode of the SMC Flex generates
a motor stop curve, which follows the stop characteristics of a centrifugal
pump. The motor stop curve results in the gradual decrease in motor speed.
IMPORTANT
Pump stopping can cause motor heating, depending on the mechanical
dynamics of the pumping system. Select the lowest stopping time
setting that satisfactorily stops the pump.
Figure 12 - Pump Stop Timing Diagram
Braking Control Modes
(a)
The SMC Flex Smart Motor Controller provides the following braking control
modes of operation as standard:
Braking Control Modes
SMB—Smart Motor BrakingAccu-StopSlow Speed with Braking
Smart Motor Braking (SMB)
(a)
SMB provides motor braking for applications that require the motor to stop
faster than a coast-to-rest. Braking control with automatic zero speed shutoff
is fully integrated into the design of the SMC Flex controller. This design
facilitates a clean, straight-forward installation and eliminates the
requirement for additional hardware (for example, braking contactors,
resistors, timers, and speed sensors). The micro-processor based braking
system applies braking current to a standard squirrel-cage induction motor.
The strength of the braking current is programmable from 0…400% of full-load
current.
(a) Not intended to be used as an emergency stop. Consult the applicable standards for emergency stop requirements.
16Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Figure 13 - SMB Timing Diagram
Motor Speed
Automatic Zerospeed Shutoff
100%
Time (seconds)
Start
RunBrake
Smart Motor Braking
Coast-to-Rest
Stop Time
Motor Speed
100%
Time (seconds)
Slow
Speed
Run
7 or 15%
Braking
Coast-to-Rest
StopStart
Chapter 1 Product Overview
Slow Speed with Braking
(a)
Slow Speed with Braking is used on applications that require slow speed (in
the forward or reverse direction) for positioning or alignment and also require
braking control to stop. Preset Slow Speed provides either 7% of base speed
(low) or 15% of base speed (high) settings in the forward direction. Braking
current is adjustable from 0…400%.
Figure 14 - Slow Speed with Braking Timing Diagram
Accu-Stop
(a)
Use Accu-Stop in applications that require controlled position stopping.
(a) Not intended to be used as an emergency stop. Consult the applicable standards for emergency stop requirements.
Rockwell Automation Publication 150-UM008I-EN-P - October 202017
During stopping, braking torque is applied to the motor until it reaches the
configured preset slow speed value (7% or 15%) and holds the motor at this
speed until a stop command is given. Braking torque is then applied until the
motor reaches zero speed. Braking current is programmable from 0…400% of
full-load current.
Chapter 1 Product Overview
Motor Speed
100%
Time (seconds)
Slow
Speed
Run
7% or 15%
Braking
Coast-to-Rest
BrakeStart
Slow Speed
Slow Speed
Braking
7% or 15%
Figure 15 - Accu-Stop Timing Diagram
Protection and Diagnostics
This section describes the protection and diagnostic features that the SMC
Flex controller provides.
Overload
The SMC Flex controller meets applicable requirements as a motor overload
protective device. Thermal memory provides added protection and is
maintained even when control power is removed. The built-in overload
controls the value that is stored in Parameter 12, Motor Thermal Usage; an
Overload Fault occurs when this value reaches 100%. The programming
parameters in this section provide application flexibility and easy setup.
Parameter No.ParameterRange
44Overload ClassOff, 10, 15, 20, 30
47Overload ResetManual – Auto
46Motor FLC1.0…2200 A
45Service Factor0.01…1.99
The trip rating is 117% of the programmed FLC. Figure 16
the overload trip curves for the available trip classes.
and Figure 17 provide
Underload
(a)
Utilizing the underload protection of the SMC Flex controller, motor operation
can be halted if a sudden drop in current is sensed.
The SMC Flex controller provides an adjustable underload trip setting from
0…99% of the programmed motor full-load current rating. You can adjust the
Trip delay time from 0…99 seconds.
(a) Underload protection is disabled during slow speed and braking operations.
18Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Figure 16 - Overload Trip Curves
1
10
100
1000
100000
1
01
4 5 6 7 8329
1
10
100
1000
100000
1
01
4 5 6 7 8329
1
10
100
1000
100000
1
01
4 5 6 7 8329
1
01
4 5 6 7 8329
0.1
1.0
10.0
100.0
1000.0
Graph LineDescription
Approximate trip time for 3-phase balanced condition from COLD start
Approximate trip time for 3-phase balanced condition from HOT start
Approx. Trip Time [s]
Multiples of FLC
Class 10Class 15Class 20Class 30
Multiples of FLCMultiples of FLCMultiples of FLC
Approx. Trip Time [s]
Approx. Trip Time [s]
Approx. Trip Time [s]
Graph LineTrip Class Auto Reset Time [s]
1090
15135
20180
30270
Seconds
Percent Full Load Current Setting
Chapter 1 Product Overview
Figure 17 - Restart Trip Curves after Auto Reset
100000
1000
100
10
1000%100% 1000%100%
1
0
Rockwell Automation Publication 150-UM008I-EN-P - October 202019
Chapter 1 Product Overview
Undervoltage
You can halt motor operation if a sudden drop in voltage is detected by
utilizing the undervoltage protection of the SMC Flex controller.
The SMC Flex controller provides an adjustable undervoltage trip setting from
0…99% of the programmed motor voltage. You can adjust the trip delay time
from 0…99 seconds.
You can program an alarm (pre-fault) indication level to indicate when the unit
is getting close to faulting. The alarm modification information is displayed
through the LCD, HIM, Communication (if applicable) and alarm contact
closing.
Overvoltage
You can halt motor operation if a sudden increase in voltage is detected by
utilizing the overvoltage protection of the SMC Flex controller.
The SMC Flex controller provides an adjustable overvoltage trip setting from
0…199% of the programmed motor voltage. Trip delay time can be adjusted
from 0…99 seconds.
(a)
(a)
You can program an alarm (pre-fault) indication level to indicate when the unit
is getting close to faulting. The alarm modification information is displayed
through the LCD, HIM, Communication (if applicable) and alarm contact
closing.
Unbalance
The SMC Flex controller can detect an unbalance in line voltages. You can halt
motor operation if the unbalance is greater than the desired range.
The SMC Flex controller provides an adjustable unbalance setting from 0…25%
of the line voltages. Trip delay time can be adjusted from 0…99 seconds.
You can program an alarm (pre-fault) indication level to indicate that the unit
is getting close to faulting. The alarm modification information is displayed
through the LCD, HIM, Communication (if applicable) and alarm contact
closing.
(a)
(a) Undervoltage, overvoltage, and voltage unbalance protection are disabled during braking operation.
20Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Chapter 1 Product Overview
600%
% FLC
Time [s]
Programmed Start Time
Stall
% FLC
Time [s]
Running
Jam
User-defined Trip Level
Stall Protection and Jam Detection
Motors can experience locked-rotor currents and develop high torque levels if
a stall or a jam occurs. These conditions can result in breakdown of the
winding insulation or mechanical damage to the connected load. The
SMC Flex controller provides both stall protection and jam detection for
enhanced motor and system protection. A jam level (as a percent of motor FLC)
is configurable for both an alarm and motor shutdown (fault). In addition,
both stall and jam conditions let you set a delay time before initiating an alarm
(jam only) or motor shutdown (fault).
Stall protection is user adjustable from 0.0…10.0 seconds (in addition to the
ramp time programmed).
Figure 18 - Stall Protection
Jam detection lets you determine the jam level (up to 1000% of the motor’s FLC
rating) and the delay time (up to 99.0 seconds) for application flexibility.
Figure 19 - Jam Detection
100%
(a) (b)
You can program an alarm (pre-fault) indication level to indicate when the unit
is getting close to faulting. The alarm modification information is displayed
through the LCD, HIM, Communication (if applicable) and alarm contact
closing.
(a) Jam detection is disabled during slow speed and braking operation.
(b) Unit self-protects in a jam condition.
Rockwell Automation Publication 150-UM008I-EN-P - October 202021
ATTENTION: The ground fault sensing feature of the SMC Flex controller is intended
for monitoring purposes only. It is not intended as a ground fault circuit interrupter
for personnel protection as defined in Article 100 of the National Electrical Code
(NEC) and has not been evaluated to UL 1053.
In isolated or high impedance-grounded systems, core-balanced current
sensors are typically used to detect low-level ground faults that are caused by
insulation breakdowns or entry of foreign objects. Detection of such ground
faults can be used to interrupt the system to help prevent further damage, or to
alert the appropriate personnel to perform timely maintenance.
The ground fault detection capabilities of the SMC Flex controller require the
use of an external sensor. The external sensor lets you enable Ground Fault
Trip, Ground Fault Alarm, or both.
For 5…480 A devices, the recommended sensor is a Cat. No. 825-CBCT core
balance current transformer for 1…5 A core-balanced ground fault protection.
For 625…1250 A devices, the recommended sensor is listed here and provides
5…25 A core-balanced ground fault protection.
•Manufacturer: Flex-Core
•Description: 600V Rated Current Transformer
•Catalog Number: 126-252
•CT Ratio:2500:5
Figure 20 - Core Balance Current Transformer
22Rockwell Automation Publication 150-UM008I-EN-P - October 2020
When you connect the ground fault sensors, the secondary of the CT should be
shorted until you complete the connection to the SMC Flex control module.
Chapter 1 Product Overview
Ground Fault Trip
The SMC Flex controller trips with a ground fault (GF) indication if:
•No other fault currently exists
•Ground fault protection is enabled
•GF Inhibit Time (Parameter 75) has expired
•GF Current is equal to or greater than the GF Trip Level (Parameter 73)
for a time period greater than the GF Trip Delay (Parameter 74)
Table 2 - Ground Fault Trip Parameters
Parameter No. Parameter NameDescription
73Gnd Flt Level
74Gnd Flt Delay
75Gnd Flt Inh Time
IMPORTANT
The ground fault inhibit timer starts after the maximum phase of load
Defines the ground fault current at which the SMC
Flex controller trips
Defines the time period a ground fault condition
must be present before a trip occurs
Inhibits a ground fault trip from occurring during
the motor starting sequence
Adjustment
Range
1.0…5.0 A or
5.0…25 A
0.1…250 s
0…250 s
current transitions from 0 A to 30% of the device’s minimum FLA Setting
or the GF Current is greater than or equal to 0.5 A. The SMC Flex
controller does not begin monitoring for a ground fault condition until
the Gnd Flt Inh Time expires.
Ground Fault Alarm
The SMC Flex controller indicates a Ground Fault Alarm if:
•No warning currently exists
•Ground fault alarm is enabled
•GF Inhibit Time (Parameter 75) has expired
•GF Current is equal to or greater than the Gnd Flt A Lvl (Parameter 77)
Table 3 - Ground Fault Alarm Parameters
Parameter No. Parameter NameDescriptionAdjustment Range
77Gnd Flt A Lvl
78Gnd Flt A Dly
Defines the ground fault current at which the SMC
Flex controller indicates a warning
Defines the time period a ground fault alarm
condition must be present before a trip occurs
1.0…5.0 A or
5.0…25 A
0…250 s
Thermistor/PTC Protection
The SMC Flex controller provides terminals 23 and 24 for the connection of
positive temperature coefficient (PTC) thermistor sensors. PTC sensors are
commonly embedded in motor stator windings to monitor the motor winding
temperature. When the motor winding temperature reaches the PTC sensor’s
temperature rating, the PTC sensor’s resistance transitions from a low to high
value. Because PTC sensors react to actual temperature, enhanced motor
protection can be provided to address such conditions as obstructed cooling
and high ambient temperatures.
Rockwell Automation Publication 150-UM008I-EN-P - October 202023
Chapter 1 Product Overview
1330
550
250
100
20
10
-20 °C 0 °C
TNF -20K
TNF -5K
TNF
TNF +20K
TNF +5K
4000
Table 4 defines the SMC Flex PTC thermistor input and response ratings:
Table 4 - PTC Input Ratings
DescriptionValue
Response resistance3400 Ω ± 150 Ω
Reset resistance1600 Ω ± 100 Ω
Short-circuit Trip Resistance25 Ω ± 10 Ω
Maximum Voltage at PTC Terminals (RPTC = 4 kW)<7.5V
Maximum Voltage at PTC Terminals (RPTC = open)30V
Maximum Number of Sensors6
Maximum Cold Resistance of PTC Sensor Chain1500 Ω
Response Time800 ms
Figure 21
illustrates the required PTC sensor characteristics that are specified
in IEC-34-11-2.
Figure 21 - PTC Sensor Characteristics per IEC-34-11-2
PTC Trip
The SMC Flex controller trips with a PTC indication if:
•No other fault currently exists
•PTC protection is enabled
The resistance across terminals 23 and 24 is either greater than the relay’s
response resistance or less than the short-circuit trip resistance.
Excessive Starts/Hour
The SMC Flex controller lets you program the allowed number of starts per
hour (up to 99). This helps minimize motor stress caused by repeated starting
over a short time period.
24Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Chapter 1 Product Overview
Overtemperature
The SMC Flex controller uses the value in Parameter 119 to monitor the
temperature of the SCRs and Bypass by using internal thermistors. When the
maximum rated temperature of the power poles is reached, the unit shuts
down and restart is inhibited.
An overtemperature condition can indicate inadequate ventilation, high
ambient temperature, overloading, or excessive cycling. After the temperature
is reduced to allowable levels, the fault can be cleared.
Open Gate
An open gate fault indicates that improper SCR firing, typically caused by an
open SCR gate, has been detected on one of the power poles. Before the
controller shuts down, it attempts to start the motor a total of three times.
Line Faults
The SMC Flex controller continually monitors line conditions for abnormal
factors. Pre-start protection includes:
•Line Fault (with phase indication)
- Line voltage loss
- Missing load connection
- Shorted SCR
Running protection includes:
•Line Fault (no phase indication)
- Line voltage loss
- Missing load connection
You can toggle Phase Reversal protection either On or Off. Phase Reversal
protection is functional only at pre-start.
Metering
Power monitoring parameters include:
•Three-phase current (Parameters 4, 5, and 6)
•Three-phase voltage (Parameters 1, 2, and 3)
•Power in kW (Parameter 7)
•Power usage in kWH (Parameter 8)
•Power factor (Parameter 11)
•Motor thermal capacity usage (Parameter 12)
•Elapsed time (Parameter 9)
Rockwell Automation Publication 150-UM008I-EN-P - October 202025
Chapter 1 Product Overview
DPI
Voltage measurement is not available during the braking operation of the
Smart Motor Braking, Accu-Stop, and Slow Speed with Braking control
options.
The elapsed time and kWH values are automatically saved to memory on
power down.
Motor thermal capacity usage is determined by the built-in electronic thermal
overload. An overload fault occurs when this value reaches 100%.
I/O
The SMC Flex controller can accept up to two inputs and four outputs that are
controlled over a network. The two inputs are controlled at terminal 16 (Option
Input #1, Parameter 132), and terminal 15 (Option Input #2, Parameter 29). For
these two inputs, see Table 26
Table 40
for the bit identification.
You can program the Stop Input to meet the desired stop functionality by
using these two terminals as inputs.
for the parameter settings and Table 39 and
The four outputs are Aux #1 (Parameter 107), Aux #2 (Parameter 110), Aux #3
(Parameter 108), and Aux #4 (Parameter 109). All auxiliary contacts are
programmable to the function found in Table 26
. If the outputs are
programmed to Network or Network NC, they can be controlled over a
Network. See Table 40
, which defines the Logic Command Word (Control).
Communication
A serial interface port (DPI) is provided as standard, which lets you connect the
SMC Flex controller connection to the Bulletin 20-HIM LCD interface
modules.
Figure 22 - DPI Location
You can connect two peripheral devices to the DPI. The maximum output
current through the DPI is 280 mA.
26Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Chapter 1 Product Overview
Port 5 — DPI
Communications
Port 2
Ports 2 and 3 when two
HIMs are connected with a
splitter
Aux #1
Aux #2 Aux #3
Aux #4
PTC
TACH
Ground
Fault
Stop
Start
Option Input #1
Option Input #2
Programming
Status Indication
Setup is easy with the built-in keypad and three-line, 16 character backlit LCD.
Parameters are organized in a three-level menu structure that uses a text
format for straightforward programming.
Figure 23 - Built-in Keypad and LCD
•Four programmable hard contact outputs are provided as standard. All
auxiliary contacts are programmable for the following states:
•Normal (selectable N.O./N.C.)
•Up-to-Speed (selectable N.O./N.C.)
•Alarm (selectable N.O./N.C.)
•Fault (selectable N.O./N.C.)
•Network Control (selectable N.O./N.C.)
•External Bypass (N.O. only)
Figure 24 - Control Terminals
Network inputs can be obtained via proper programming of Option Input #1
(Parameter 132) and Option Input #2 (Parameter 24).
Rockwell Automation Publication 150-UM008I-EN-P - October 202027
Chapter 1 Product Overview
Notes:
28Rockwell Automation Publication 150-UM008I-EN-P - October 2020
Chapter 2
Installation
This chapter explains how to receive, unpack, and set up the SMC™ Flex
controller.
Receive the Controller
Unpack the Controller
Inspect the Controller
Storage
It is your responsibility to thoroughly inspect the equipment before accepting
the shipment from the freight company. Check the item(s) received against the
purchase order. If any items are damaged, it is your responsibility not to
accept delivery until the freight agent has noted the damage on the freight bill.
Should any concealed damage be found during unpacking, it is again your
responsibility to notify the freight agent. The shipping container must be left
intact and the freight agent should be requested to make a visual inspection of
the equipment.
Remove all packing material, wedges, or braces from within and around the
controller.
After you unpack the controller, check the item(s’) nameplate catalog number
against the purchase order.
Keep the controller in its shipping container prior to installation. If the
equipment is not to be used for an extended period, you must store it
according to the following instructions in order to maintain warranty
coverage.
Lifting
•Store in a clean, dry location.
•Maintain an ambient temperature range of –20… +75 °C (–4…+167 °F).
•Store within a relative humidity range of 0% to 95%, noncondensing.
•Do not store equipment where it could be exposed to a corrosive
atmosphere.
•Do not store equipment in a construction area.
For controllers rated 625…1250 A, the device should only be lifted from
designated lifting points. The lifting points are designed to accept a 1/2…13
threaded hoist ring capable of lifting 2500 pounds. Figure 26
points.
Rockwell Automation Publication 150-UM008I-EN-P - October 202029
shows the lifting
Chapter 2 Installation
Lifting Points
Figure 25 - Lifting Caution Label
Figure 26 - Lifting Points
General Precautions
In addition to the precautions listed throughout this manual, you must read
and understand the following statements, which are general to the system.
ATTENTION: The controller contains ESD- (electrostatic discharge) sensitive
parts and assemblies. Static control precautions are required when installing,
testing, servicing, or repairing the assembly. Component damage may result if
ESD control procedures are not followed. If you are not familiar with static
control procedures, refer to applicable ESD protection handbooks.
ATTENTION: An incorrectly applied or installed controller can damage
components or reduce product life. Wiring or application errors, such as
undersizing the motor, incorrect or inadequate AC supply, or excessive
ambient temperatures, may result in malfunction of the system.
ATTENTION: Only personnel familiar with the controller and associated
machinery should plan or implement the installation, start-up, and subsequent
maintenance of the system. Failure to do this may result in personal injury
and/or equipment damage.
30Rockwell Automation Publication 150-UM008I-EN-P - October 2020
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