motortronics VMX2-18-BP User manual

MOTORTRONICS
TM
Solid State AC Motor Control
USER MANUAL
208 - 600V, 9 - 1250 Amps, 5 - 1200 HP
VMX2 SERIES COMPACT SOFT STARTER
VMX2

Table of Contents
Page
Chapter 1 - Introduction
1.1 General Description ………………………..
1
1.2 Sizes and Ratings …………………………..
4
Chapter 2 - Installation
2.1 Receiving and Unpacking ………………….
5
2.2 Choosing a Location ………………….........
5
2.3 Initial Unit Inspection …………………........
5
2.4 SERVICE WARNING! ……………………..
6
2.5 Mounting and Cleaning …………………….
6
2.6 Power Terminations ………………………..
7
2.7 Remote Keypad Mounting…………............
9
2.8 Dimensions ……………………………........
10
Chapter 3 - Motor Overload Protection
3.1 Solid State Overload Protection …………..
11
3.2 NEMA Class Trip Curves …………….........
13
Chapter 4 - Connections
4.1 Power Connections ………………………...
15
4.2 Control Connections ………………………..
16
Chapter 5 - Programming
5.1 Introduction ……………………………….....
23
5.2 Digital Interface ……………………………..
23
5.3 Display Modes ………………………………
24
5.4 Program Mode ………………………………
25
5.4.5 Fault Mode …………………………….
28
5.5 The VMX2 Function List ………………......
30
5.6 Function Descriptions ………………………
37
5.6.1 Motor and Overload Functions ………
37
5.6.2 Starting Modes…………………………
39
5.6.3 Jog Mode…………………….. ……….
42
5.6.4 Kick Start Mode ……………………….
43
5.6.5 Pump-Flex Decel Mode ………………
44
5.6.6 Restart Delay ………………………….
45
5.6.7 Voltage Protection …………………….
45
5.6.8 Current and Ground Fault Protection..
47
5.6.9 Lockouts, Reset & Internal Protection
50
5.6.10 Output Relays …………………………
54
5.6.11 Serial Communications……………….
55
5.6.12 System Settings ………………………
56
5.6.13 Fault History and Statistical Data……
58
5.6.14 Phase Protection Settings……..….….
60
5.6.15 Motor Power Protection Settings…….
61
5.6.16 Analog Output………………………….
62
5.6.17 Display & System Settings……………
64
Chapter 6 - Start-up
6.1 Basic Startup ………………………………..
65
6.2 Start-up Check List …………………………
66
6.3 Sequence of Operation ………………........
66
6.4 Testing with a smaller motor ………………
67
Chapter 7 - Fault Conditions
7.1 Fault Codes and Numbers ……………......
67
7.2 Fault Explanation …………….....................
70
Appendices
Appendix 1: Ramp Profile Details …………………………………………………………………...
71
Appendix 2: Pump-FlexDecel Mode Application Considerations ……………………………...
74
Appendix 3: Parameter Lock / User Password Instructions ……………………………………..
77
Appendix 4: External Overload Relay Application…………………………………………….....
79
Appendix 5: Soft Starter Settings Record ………………………….…………….………………...
84
Warranty Information...………….…………………………………………………………………….
91

VMX2Series Digital Solid State Soft Starter User Manual 1 | P a g e
Chapter 1 - Introduction
1.1 General Description
The VMX2 Series is a digitally programmable solid-state reduced
voltage soft starter. Its six SCR design features a voltage/current ramp
with an anti-oscillation circuit for smooth load acceleration. The SCRs
are sized to withstand starting currents of 500% for 20 seconds
(Standard Duty) and up to 500% for 60 seconds (Heavy Duty). The
VMX2 Series features smooth, stepless ramp control, which reduces
motor inrush current and excessive wear on the mechanical drive train
components. The VMX2 Series includes a programming keypad for
setting operating parameters for the ideal starting cycle and protection
features, plus easy to understand diagnostic LEDs. Starting torque,
ramp time, current limit, dual ramp, and Decel control are standard
features on the VMX2 Series. By simply adjusting the units’starting
torque, ramp time, and current limit functions, the starting electrical
characteristics of the motor can be matched to the mechanical
characteristics of the drive train for controlled acceleration of the load.
The VMX2 Series includes solid-state electronic overload protection in
addition to numerous other protective features. It requires 120VAC
(220VAC optional) control power and uses dry contact inputs for Start /
Stop control. Programmable auxiliary contacts and provisions for
interlocking are also included.
1.1.1 Control Features
Acceleration Adjustments
Programmable Ramp Types:
Voltage Ramp (VR) or closed loop Current Ramp (CR)
Initial Values: 0 - 100% of line voltage (VR)
or 0 - 600% of motor FLA (CR)
Ramp Time: 1 to 120 seconds
Current Limit: 200 - 600% (VR or CR)
Dual Ramp Settings
4 Options:
Ramps 1 & 2 = VR.
Ramp 1 = VR, Ramp 2 = CR.
Ramps 1 & 2 = CR.
Ramp 1 = CR, Ramp 2 = VR.
Dual Ramp Control:
Ramp #1 = Default.
Ramp #2 = Selectable via dry contact input.
Deceleration Adjustments
Begin Decel Level: 0 - 100% of line voltage
Stop Level: 0 to 1% less than Begin Decel Level
Decel Time: 1 - 60 seconds
Programmable to Decel or coast to stop upon overload trip.
Jog Settings
Jog function selected via dry contact closure input.
Jog Voltage: 5 - 100%
Time of Jog Voltage: 1 - 20 seconds
Jog Current: 100 - 500%
Kick Start Settings
Kick Voltage: 10 - 100%
Kick Time: 0.1 - 2 seconds

VMX2Series Digital Solid State Soft Starter User Manual 2 | P a g e
1.1.2 Advanced Motor Protection Features
Thermal Model Electronic
Overload Protection
A sophisticated Thermal Model of the motor operation is created in the
microprocessor to accurately track all starting, stopping, and running conditions,
thus, providing maximum motor protection.
Two Stage
Overload Curves
Starting: Programmable for Class 5 through 30
Run: Programmable for Class 5 through 30 when "At-Speed" is detected.
Overload Reset
Manual (default) or automatic.
Retentive Thermal Memory
Overload circuit retains thermal condition of the motor regardless of control
power status. Unit uses real time clock to adjust for off time.
Dynamic Reset Capacity
Overload will not reset until thermal capacity available in the motor is enough for
a successful restart. Starter learns and retains this information by monitoring
previous successful starts.
Current Imbalance Trip
Trip Level: 5 - 30% Imbalance in any two phases.
Trip Delay: 1 -20 seconds.
Over Current Trip
(Electronic Shear Pin)
Trip Level: 100 - 300% of FLA
Trip Delay: 1 - 20 seconds
Voltage Protection
Over Voltage Trip Level: 1 - 10% of Line Voltage.
Under Voltage Trip Level: 1 - 20% of Line Voltage.
Separate Under Voltage levels for Start and Run modes.
Voltage Imbalance Trip Level: 1 - 30% Phase Difference.
Voltage Imbalance Trip Delays: 1 - 20 seconds.
Phase Loss
Phase Loss trip: Any phase current less than 12% of unit CT value.
Can be disabled in programming for testing with smaller loads.
Phase Rotation
Phase Rotation Trip: ABC, ACB or insensitive.
Phase Protection Trip Delays: 1 - 3 seconds.
Power Protection
Motor kW Trip Settings: Over / Under Trip.
Under kW Trip Level: 20 - 100% of calculated motor kW.
kW Trip Delay: 1 - 9999 minutes.
PF Trip Setting: Lead, Lag or Lead/Lag.
PF Trip Level: 0.01 - 1.0 (cos. θ).
PF Trip Delay Time 1 - 2 seconds.
Equipment Ground Fault
Protection
Type: Residual Current Method.
Range: 5 - 90% of unit CT ratio.
Trip Delay: 1 - 60 seconds.
Load Loss Trip
Under Current Trip Level: 10 - 90% of motor FLA.
Trip Delay: 1 - 60 seconds.
Coast Down (Back Spin)
Lockout Timer
Prevents restart when motor may be spinning backwards.
Coast Down Time Range: 1 - 3600 seconds.
Starts-per-hour Lockout
1 - 10 successful starts per hour.
Minimum Time between
Starts Lockout
Range: 1 - 60 minutes between start attempts.
Restart Delay
Sequential Start Feature for restarting delay after a power outage ends.
1-999 seconds after a power loss.
Auto Reset
Can be programmed to attempt resetting after selected faults.
0 - 10 Attempts, in 1 minute cycles.
Power Device Monitoring
Shorted SCR Lockout (1 shorted SCR) and independent Shunt Trip (multiple
shorted SCRs). Can be disabled in programming.

VMX2Series Digital Solid State Soft Starter User Manual 3 | P a g e
1.1.3 Design Specifications
Type of Load:
Three - phase AC induction motors.
AC Supply Voltage:
Universal, 208 - 600VAC ±10%, 50/60 Hz.
Power Ratings:
9 - 1250 Amps, 7.5 - 1000 HP @ 460V.
Unit Capacity - Continuous
Max. Amp rating is UL Listed continuous rating.
Unit Capacity - Overload Rating
(Percent of motor FLA)
500% - 60 seconds.
Power Circuit
6 SCRs, full phase angle firing using a hard fire firing circuit to avoid motor
transient problems.
SCR Firing Angle Detection
6 pulse Independent Locked Phase Tracking with Auto-synchronization,
prevents misfiring on unstable source frequency.
SCR PIV Ratings
(Peak Inverse Voltage)
1600V
Transient Protection
RC snubber dV/dt networks on each phase.
Cooling
Fan assisted convection.
Bypass Contactor
Standard on all units.
Bypass Contactor Rating
Shunt rated or can be sized for Line start rating.
Bypass Contactor Control
Integral control is included, but contactor can be externally controlled as well.
Ambient Condition Design
0° to 40°C (32° to 122°F)
5 - 95% relative humidity.
0 - 3300 ft. (1000m) above sea level without derating.
Control Power
120VAC (customer supplied), 240VAC optional.
Inputs
6 Dry (voltage free) contact inputs using 24VDC from an internal power supply.
Programmable Relay Outputs
3 relays, 2 each Form C (SPDT), 1 each Form A (SPST).
Can be programmed for 32 functions, with delays or flashing.
Output Relay Contact Rating
5 Amps, 240VAC max. (1200VA).
Programmable Analog Outputs
1 analog output 4-20mA
Can be programmed for 12 functions with scaling.
Dedicated Fault Output
AC Triac solid state switch.
240VAC, 50mA max.
Approvals
UL Listed, Canadian UL (cUL) Listed CE Approved. UL 60947-4-2

VMX2Series Digital Solid State Soft Starter User Manual 4 | P a g e
1.2 Sizes and Ratings
The Motortronics VMX2 Series starters are current rated controllers.
Max. Amp ratings are for continuous duty and must not be exceeded.
Always check the motor nameplate FLA and Service Factor to ensure
proper sizing.
Each size has an adjustable current range of 50% to 100% of the Max
Amp rating. Table 1.2 shows the Current Ratings available.
1.2.1 Selecting for Service Factor Utilization
Many NEMA design motors include a design rating referred to
as Service Factor (SF) that may allow continuous operation
above the nameplate current rating. If using this Service
Factor, the VMX2 Series starter must be sized for the total
amps used. For proper selection of the VMX2 Series starter
when using SF continuously, multiply the nameplate FLA by
the stated Service Factor, or use stated Service Factor Amps
(SFA) if listed on the nameplate. The following excerpt is from
the NEMA MG-1 standards for AC Motors that describes the
issues concerning the use of Service Factor ratings.
"When an induction motor is operated at any service factor
greater than 1.0, it may have efficiency, power factor and
speed different than those at rated load. Locked rotor torque
and current and breakdown torque will remain the same. A
motor operating continuously at any service factor greater than
1.0 will have a reduced life expectancy compared to operating
at its nameplate horsepower."
When using this feature, simply program the VMX2 Series
Service Factor (F002) to the nameplate rating. (See section
5.6.1.) All other adjustments to the protection circuits are done
automatically within the VMX2 Series.
1.2.2 Selecting for Across the Line Bypass
If you need to be able to start the motor Across-the-Line when
the VMX2 Series electronics are out of service, the starter can
also be selected based upon the rating of the Bypass
Contactor. Some users may also elect to size their Bypass
Contactors per NEMA guidelines. When doing this, please
refer to the Product Selection Guide for details and notes, and
see Appendix 4 for special considerations regarding Overload
Protection.
1.2.3 The VMX2…-BP Series starters include the ability to connect
a dry contact directly to the Bypass Contactor coil control circuit.
These terminals are covered when shipped and should be used
ONLY when necessary for Emergency Bypass operation and with
an external Overload Relay. See Appendix 4 for additional
information.
No field wiring to these terminals is necessary if this feature is not
used.
Table 1.2 VMX2 Series Range
Model
Number
Current
Range
Min.- Max.
VMX2-18-BP
9 - 18
VMX2-28-BP
14 - 28
VMX2-39-BP
19 - 39
VMX2-48-BP
24 - 48
VMX2-62-BP
36 - 62
VMX2-78-BP
39 - 78
VMX2-92-BP
46 - 92
VMX2-112-BP
56 - 112
VMX2-150-BP
75 - 150
VMX2-160-BP
80 - 160
VMX2-210-BP
105 - 210
VMX2-275-BP
138 - 275
VMX2-361-BP
181 - 361
VMX2-450-BP
225 - 450
VMX2-550-BP
275 - 550
VMX2-600-BP
300 - 600
VMX2-862-BP
431 - 862
VMX2-900-BP
450 - 900
VMX2-1006-BP
503 - 1006
VMX2-1250-BP
625 - 1250

VMX2Series Digital Solid State Soft Starter User Manual 5 | P a g e
Chapter 2 - Installation 2.1 Receiving and Unpacking
Upon receipt of the product, you should immediately do the following:
▪Carefully unpack the unit from the shipping carton and inspect it for
shipping damage. If damaged, notify the freight carrier and file a
claim within 15 days of receipt.
▪Verify that the model number on the unit matches your purchase
order.
▪Confirm that the ratings nameplate on the unit match or are greater
than the motors’HP and current rating with which it is to be used.
2.2 Choosing a Location
Proper location of the VMX2 Series is necessary to achieve specified
performance and normal operational lifetime. The VMX2 Series should
always be installed in an area where the following conditions exist:
▪Ambient operating temperature: 0 to 40°C (32 to 104°F)
Protected from rain, moisture, and direct sun.
▪Humidity: 5 to 95% non-condensing.
▪Free from metallic particles, conductive dust, and corrosive gas.
▪Free from excessive vibration. (below 0.5G)
▪Open panel units must be mounted in the appropriate type of
enclosure. Enclosure size and type must be suitable to dissipate
heat generated by the soft starter and any other components
mounted inside with it.
▪Care should always be taken to maximize the available space
inside of the enclosure. See section 2.5.1 or contact factory for
assistance in sizing enclosures.
2.3 Initial Unit Inspection
Make a complete visual check of the unit for damage that may have
occurred during shipping and handling. Do not attempt to continue
installation or start up the unit if it is damaged.
▪Check for loose mechanical assemblies or broken wires which may
have occurred during transportation or handling. Loose electrical
connections will increase resistance and cause the unit to function
improperly.
▪Prior to beginning the installation, verify that the motor and VMX2
Series unit are rated for the proper amperage and voltage.

VMX2Series Digital Solid State Soft Starter User Manual 6 | P a g e
2.4 SERVICE WARNING!
Do not service equipment with voltage applied! The unit can be the
source of fatal electrical shocks! To avoid shock hazard,
disconnect main power and control power before working on the
unit. Warning labels must be attached to terminals, enclosure and
control panel to meet local codes. Use Lockout tags such as the
one shown when servicing equipment.
2.5 Mounting and Cleaning
When drilling or punching holes in the enclosure, cover the electrical
assembly to prevent metal filings from becoming lodged in areas which
can cause clearance reduction or actual electrical shorts. After work is
complete, thoroughly clean, vacuum the area, and re-inspect the unit for
foreign material.
2.5.1 Clearances
Make sure there is sufficient clearance all around the unit for cooling,
wiring, and maintenance purposes. To conserve panel space, the VMX2
Series - BP models were designed for close clearances of only 1 inch
(25mm) on either side. A minimum clearance of 4 inches (100 mm) on
the top and bottom is necessary to maximize effective airflow and
cooling. Also the unit must be installed with its heat sink ribs oriented
vertically and running parallel to the mounting surface. Keep in mind
that these are minimums. NEC or local codes may require more
clearance, particularly for the power terminals.
Figure 2.5: VMX2 minimum mounting clearances

VMX2Series Digital Solid State Soft Starter User Manual 7 | P a g e
WARNING!
Remove all sources of power before cleaning the unit.
In dirty or contaminated atmospheres, the unit should be cleaned on a
regular basis to ensure proper cooling. Do not use any chemicals to
clean the unit. To remove surface dust, use clean, dry compressed air
only, 80 to 100 psi. A three-inch, high quality, dry paintbrush is helpful to
loosen up the dust prior to using compressed air on the unit. Do not use
wire brushes or other conductive cleaning materials
2.6 Power Terminations
All line and load power terminations are to be made to the tin plated
copper Bus Tabs located on each unit. Bus tabs are pre-drilled to
accept industry standard bolts. Motortronics recommends using crimp-
on ring lugs, although mechanical compression lugs are suitable as
well. The following diagrams show sizes of the bus tab holes and critical
spacing between them for determining the size of lug that can be used.
Note: All wiring must be sized according to local and national code
standards.
Figure 2.6.1 Critical clearances for bus tab connections
Figure 2.6.2 Critical clearances for bus tab connections

VMX2Series Digital Solid State Soft Starter User Manual 8 | P a g e
2.6 Power Connections (cont.)
Note: Consult factory for bus tab critical dimensions for units 210A and above
Figure 2.6.3 Critical clearances for bus tab connections

VMX2Series Digital Solid State Soft Starter User Manual 9 | P a g e
2.6.1 Power Terminals:
Connection points are bus tabs with pre-drilled holes (see below).
Suggested wire sizes and tightening torques for factory-supplied
connectors using conductors rated for 75C are shown in the chart
below. Always consult local and national codes along with industry
standard practices for proper wires sizes and terminations to
accommodate voltage drop and ambient conditions.
Table 2.6: VMX2 Series Wire Ranges and Torque Specifications
Model
Number
Current Range
Min.- Max.
Suggested
Wire Size
AWG
Tightening
Torque
in.-lbs.
Screw / Bolt
Size
Tightening
Torque
Nm
Suggested
Wire Size
ISOmm2
VMX2-18-BP
9 - 18
10
35
1 x M5
(included)
4
6
VMX2-28-BP
14 - 28
8
10
VMX2-39-BP
19 - 39
8
10
VMX2-48-BP
24 - 48
6
16
VMX2-62-BP
36 - 62
4
45
1 x M8
(included)
5
25
VMX2-78-BP
39 - 78
3
35
VMX2-92-BP
46 - 92
2
35
VMX2-112-BP
56 - 112
1
50
VMX2-150-BP
75 - 150
2/0
80
1 x M8
(included)
9
70
VMX2-160-BP
80 - 160
3/0
95
VMX2-210-BP
105 - 210
250
200
1 x 0.38" hole
(M10)
for User
supplied
lugs
15
150
VMX2-275-BP
138 - 275
350 kCMIL
185
VMX2-361-BP
180 - 361
2 x 300 kCMIL
2 x 150
VMX2-450-BP
225 - 450
2 x 300 kCMIL
2 x 150
VMX2-550-BP
275 - 550
2 x 400 kCMIL
2 x 240
VMX2-600-BP
300 - 600
2 x 500 kCMIL
TBD
TBD
TBD
2 x 300
VMX2-862-BP
431 - 862
3 x 400 kCMIL
TBD
TBD
TBD
3 x 240
VMX2-900-BP
450 - 900
3 x 500 kCMIL
TBD
TBD
TBD
3 x 300
VMX2-1006-BP
503 - 1006
4 x 350 kCMIL
TBD
TBD
TBD
4 x 185
VMX2-1250-BP
625 - 1250
4 x 500 kCMIL
TBD
TBD
TBD
4 x 300
Note: TBD = To Be Determined at a later date
2.7 Remote Keypad Mounting
The keypad / operator interface unit can be remotely mounted up to 10ft
(3 meters) away from the starter, i.e. on the enclosure door. A remote
mounting kit is necessary, which consists of an adaptor plate, a
doorframe for NEMA 1 or NEMA 12 enclosures and a pre-assembled
ribbon cable available in 1-meter length increments. Detailed assembly
instructions and an enclosure cutout template are included with the kit.
See Product Selection Guide for part numbers of the available kits.
Figure 2.7
Remote Keypad Mounting Kit
Components
VMX2 Starter
Adaptor Plate
NEMA12
Door Frame
Ribbon Cable,
1, 2, or 3 Meters
(3.28, 6.56, or 9.84 feet.)

VMX2Series Digital Solid State Soft Starter User Manual 10 | P a g e
2.8 Dimensions (consult price catalog for enclosed units)
Figure 2.8: VMX2 Dimensions
Table 2.8: VMX2 Dimensions and Weights
Enclosure
Model Number
Overall
Mounting
A
Inches
(mm)
B
Inches
(mm)
C
Inches
(mm)
D
Inches
(mm)
E
Inches
(mm)
F
Inches
(mm)
Weight
lbs
(kg)
Panel (open)
with integral
bypass
contactor
VMX2-18-BP through
VMX2-48-BP
8.85
(230)
8.00
(203)
6.65
(169.7)
8.06
(204.7)
7.00
(177.8)
0.22
(5.6)
13
(5.9)
VMX2-62-BP through
VMX2-112-BP
14.00
(355.6)
8.00
(203)
6.65
(169.7)
13.25
(336.6)
6.75
(171.5)
0.28
(7.1)
23
(10.4)
VMX2-150-BP and
VMX2-160-BP
19.00
(487.9)
8.00
(203)
6.65
(169.7)
18.25
(463.6)
6.75
(171.5)
0.28
(7.1)
35
(15.9)
VMX2 -210-BP and
VMX2-275-BP
28.10
(723.9)
12.5
(317.5)
9.1
(229.4)
27.38
(695.5)
10.75
(273.1)
0.40
(10.2)
90
(40.9)
VMX2-361-BP and
VMX2-450-BP
29.30
(744)
12.5
(317.5)
9.1
(229.4)
27.38
(695.5)
10.75
(273.1)
0.40
(10.2)
105
(47.7)
VMX2-550-BP through
VMX2 -600-BP
29.50
(786.9)
12.5
(317.5)
9.1
(229.9)
27.38
(695.5)
10.75
(273.1)
0.40
(10.2)
120
(55)
VMX2-862-BP through
VMX2-900-BP
44.25
(1124)
25.5
(647.7)
11.86
(301.3)
43.00
(1092.2)
23.00
(584.2)
0.40
(10.2)
Contact
Factory
VMX2-1006-BP through
VMX2 -1250-BP
50.77
(1182.6)
25.5
(716.3)
13.28
(332.7)
42.75
(1095.9)
23.25
(590.5)
0.40
(10.2)
Contact
Factory
F dia.
D
E
B
A
C
~ ~
~

VMX2Series Digital Solid State Soft Starter User Manual 11 | P a g e
Chapter 3 - Motor Overload Protection
3.1 Solid State Overload Protection
The VMX2 Series Starter provides true U.L. listed I2t Thermal Overload
Protection as a built-in function of the main digital processor for
maximum motor protection. It mimics the tripping action of a bi-metallic
overload relay, with the accuracy and repeatability of a digital control
system. It is adjustable over a wide range and can easily be
programmed to different trip curves.
3.1.1 Thermal Memory
The VMX2 Series microprocessor uses a sophisticated “Thermal
Register” in the digital memory to keep track of motor heating and
cooling over time regardless of the starter’s power status. By using non-
volatile memory, the VMX2 Series does not “forget” that the motor has
been running even if power to the starter is turned off and turned back
on. Continuous overload protection is provided based on the true
thermal condition of the motor.
3.1.2 Thermal Capacity
The Thermal Register is displayed as a percentage. This percentage is
the motor’s remaining thermal capacity. The percentage value begins at
100; showing that the motor is cool (has 100% of its capacity available).
As the motor heats up or moves toward an overload condition, the
percentage begins to drop. The Thermal Capacity is derived from the
programmed motor nameplate Full Load Amps (FLA) in Function F001,
the Service Factor rating in Function F002, and the Overload Trip Class
in Functions F003 and F004. Setting these functions to the proper
values provides maximum protection and eliminates nuisance tripping.
The Remaining Thermal Capacity can be viewed by using the UP or
DOWN arrow keys when in the Status Display mode. From the default
Phase A Current screen (dot on right side), press the UP arrow key 4
times to display [H100] meaning there is 100% of the Thermal Capacity
(H = Heat capacity) remaining in the motor. After starting or running, the
motor will use this capacity and the display will show a lower number.
For example, after a cold start, the display may read [H065] which
indicates that the motor has 65% of its thermal capacity remaining (35%
used). The Status Display screens cycle back to the beginning, so the
Down arrow keys can access this display as well.
▪3.1.2.a Motor Full Load (FLA) Setting
Use Function F001 to enter motor FLA as indicated on the motor
nameplate. (Do not calculate for service factor, this is programmed
separately in F002).
▪Note:
All VMX2 Series starters are shipped from the factory with F001 set
to a default value of 0000. If F001 is left at the factory default, the
unit will not operate. If the user attempts to start the VMX2 Series
without entering the motor nameplate FLA, the starter will Fault and
the display will read “nFLA” (no Full Load Amps).
H100
H057
100% Thermal
Capacity remaining
at rest
57% Thermal Capacity
remaining after starter
(43% used)
Examples:
MOTOR FLA (F001)
must be programmed
for unit to operate!

VMX2Series Digital Solid State Soft Starter User Manual 12 | P a g e
3.1.3 Disabling the Overload Protection
The Overload Protection feature can be disabled if necessary. When
using external devices such as Motor Protection Relays or when the
VMX2 Series is wired downstream from an existing starter, this feature
can be disabled to prevent conflicts with external Overload Protection
devices. When the VMX2 Series is controlling multiple motors, the built-
in Overload Protection must be disabled and individual thermal overload
relays must be installed on the motor leads going to each motor (see
Appendix 4 for additional details). To disable the Overload Protection
function, use F005.
WARNING!
Do NOT disable Overload Protection unless another Thermal
Overload Protection device exists in the circuit for all three
phases. Running a motor without Overload Protection presents serious
risk of motor damage or fire.
▪3.1.3.a Manual Reset
The factory default setting is Manual Reset. This means that when
the Overload Trip is activated, the starter cannot be restarted
without pressing the Reset key. The Overload Trip will not reset
until the motor cools down (see 3.1.3.d). The Manual Reset function
is also “trip free”. Holding in the Reset key will not prevent the
Overload Trip from activating and protecting the motor.
▪Note:
When the Overload Trip activates, the Overload LED will be on
solid. When the motor cools down, the LED will begin to flash,
indicating that the Overload Trip can be reset.
▪3.1.3.b Automatic Reset
If Automatic Reset is necessary, change from Manual Reset to
Automatic Reset by using Function F005. (See Section 5 for
details). In this mode, a 3-wire control circuit will be capable of
restart when the VMX2 Series has reset itself after the cool down
period.
WARNING!
Two-wire control systems may restart without warning when Auto
Reset of the Overload Protection is selected. Extreme caution
should be exercised. To prevent automatic restarting with 2-wire
control systems, use external interlocking to provide sufficient
warning and safety to operators. A Warning Label similar to that
shown below (and the one provided in the packet with this manual)
must be located where visible (on the starter enclosure and/or the
driven equipment) as required by local code.
WARNING: MOTOR CONNECTED TO THIS EQUIPMENT
MAY START AUTOMATICALLY WITHOUT WARNING

VMX2Series Digital Solid State Soft Starter User Manual 13 | P a g e
▪3.1.3.c Overload Protection During Bypass
When an integral Bypass Contactor is used to shunt power around
the SCRs in the VMX2 Series (as in the VMX…-BP version),
overload protection is maintained as long as the VMX2 Series is
directly controlling the contactor. No additional Overload Relay is
necessary for normal operation.
▪When the Bypass Contactor on a VMX2…-BP Series has been
selected to be used for Across-the-Line restart (reference section
1.2.3), supplemental overload protection is necessary. For this
application, refer to the External Overload Relay Applications
supplement and wiring diagram in Appendix 4.
▪3.1.3.d Dynamic Reset Capacity
The VMX2 Series includes the ability to dynamically track the
Thermal Capacity needed for a successful restart after an overload
trip. It averages the Thermal Capacity consumed in the previous
three successful starts, and calculates a Thermal Capacity to Start
(viewed in Function F059). After tripping on Overload, the Thermal
Register must have regained the amount recorded in F059 before a
Reset will be allowed. If the display reads [ Inh] when attempting to
reset an overload trip, it is indicating that the starter is Inhibited from
being reset.
Refer to details of Function F071 for information on emergency
override of lockouts such as this.
3.2 NEMA Class Trip Curves
NEMA Class trip curves are based on a common tripping point of 600%
of motor Full Load Amps (FLA). Curves vary by the amount of time
before the unit trips. As an example, a Class 20 curve will trip in 20
seconds at 600% of FLA. The factory default setting of Class 10 will trip
in 10 seconds at 600% of FLA.
3.2.1 Dual Overload Trip Curves
The VMX2 Series Soft Starter provides two separate Overload Trip
Protection Curves, one for starting and one for running conditions. The
starter’s At-Speed detection circuit determines when the motor has
reached full speed. When the At-Speed condition is reached, the
overload trip curve will shift from the Start to the Run level, as
programmed in Functions F003 and F004. See Section 5.6.1 for
programming details.
3.2.2 Starting Overload Trip Curve
During the start mode, Overload Trip Curves are selectable from NEMA
Class 5 through Class 30 only. The default setting of Class 10 allows
protection for the overload capacity of the soft starter as well as the
motor. Use a higher Trip Class only if nuisance tripping occurs with the
default setting.

VMX2Series Digital Solid State Soft Starter User Manual 14 | P a g e
3.2.3 Running Overload Curve
During the Run mode, Overload Trip curves are selectable from NEMA
Class 5, 10, 15, 20, 25, and 30. Program the appropriate curve
according to the characteristics of your motor and load.
3.2.4 Overload Trip Curve Chart
Figure 3.2.4: VMX2 Series Overload Trip Curves

VMX2Series Digital Solid State Soft Starter User Manual 15 | P a g e
Figure 4.1:
VMX2 Power Connections
Chapter 4 - Connections
4.1 Power Connections
Refer to national and local code for wire sizing and length, connect
power conductors to the unit input terminals marked L1, L2, L3 (R, S, T
for IEC users). Use appropriate compression or mechanical lugs for
termination to these bus tabs. Avoid routing power wires over the
control board or display. Connect the motor leads to the unit terminals
marked T1, T2, T3 (U, V, W for IEC users). If control power is present,
but line power is disconnected from L1, L2, L3, the display will show
[n3PH] indicating “no 3 Phase”.
Caution! Never interchange input and output connections to
the unit. This could cause excessive voltage in the
control logic circuit and may damage the unit.
4.1.1 Bypass Contactor
Bypass Contactors are integral (built-in) on all VMX2 sizes. See
sections 1.2.3, 3.1.3.c, and Appendix 4 for more details on contactor
control and overload protection details.
4.1.2 Power Factor Correction Capacitors
Power factor correction capacitors can be connected to motors
controlled by VMX2 Series starters; however they must be off-line
during ramping. Connect PFC capacitors to the Line side of the starter
with a separate capacitor control contactor.
WARNING!
Never connect power factor correction capacitors on the load side
of the unit. The SCRs will be seriously damaged if capacitors are
located on the load side.
4.1.3 Grounding
Connect the ground cable to the ground terminal as labeled on the unit.
Refer to the National Electrical Code or your local Code for the proper
ground wire size, and be sure that the ground connector is connected to
earth ground.
Integral
Bypass
Contactor*
VMX2 Starter
.
Disconnect
or
Circuit
Breaker
.
.
MTR
Solid State
Overload
G
R /
L1
T
/
L3
S /
L2
U /
T1
W
/
T3
V /
T2

VMX2Series Digital Solid State Soft Starter User Manual 16 | P a g e
4.1.4 Testing
The VMX2 Series can be tested with a load smaller than the motor it
was originally selected to control, however additional steps must be
taken to avoid tripping on Phase Current Loss. See section 5.6.8.a
under “Phase Loss Protection” for additional details on performing this
task.
▪Notes:
The unit cannot be tested without a motor or other test load
connected to the load side of the unit. It may be necessary to use a
load bank to test the unit without a motor.
▪Line voltage will appear across the output terminals if there is no
motor or load connected to the unit.
4.1.5 Lightning Protection
As with all electronic power controllers, protection from damage by
lightning surges is recommended in areas where lightning is a
significant problem. Stationary SPDs (Surge Protection Device) should
be considered and utilized on the input power source. The best method
of protection is to have an Isolation Contactor in front of the starter that
is open when the soft starter is not in use. Enclosed versions can be
ordered with an OPTIONAL surge protection device.
4.2 Control Connections
Control connections on the VMX2 Series starter are divided into 2
groups. With the unit oriented vertically, TB1 is a 12-point DC terminal
block (on the left), and TB2 is a 10-point AC terminal block (on the right
side). These are removable terminal blocks for ease of connection and
servicing, and are provided with different spacing (pitch) between the
header pins, so they are not interchangeable. Following are descriptions
of control connection points.
▪Note:
Terminal numbers are shown on the side of the first and last
terminal of each block. An additional 3 point terminal on the far left
side is for serial communication connections (see section 5.6.10).
Figure 4.2: Control Terminal Blocks

VMX2Series Digital Solid State Soft Starter User Manual 17 | P a g e
4.2.1 AC Control Power Supply Connection
Separate AC Control Power supply is required to power the electronics
of the VMX2 Series starter. The standard is 120VAC, but 240VAC
(optional) can be ordered if necessary for your line power supply
configuration. The control voltage must be connected to terminals
marked A1 and A2 of TB-2 as shown in figure 4.2.1 (these are also
Terminal No.’s 21 and 22). This control voltage must be customer
supplied, unless an optional control power transformer (see table below)
has been supplied with the unit.
▪4.2.1.a Control Power Requirements
When sizing a control power transformer for the VMX2…-BP Series
starter use the above chart for minimum sizes or supply capacity.
Any additional control devices powered by the same CPT must be
added to the above values to ensure proper operation of the Bypass
Contactor.
▪4.2.1.b Control Fusing
The output relay contacts (TB2) must be protected from currents in
excess of 5A by either using fuses or other suitable current
protection devices.
▪A dedicated fault output for use in PLC or interposing relay control
is available on TB1. This opto-isolated Triac switch is rated for
50mA max., 10-250V AC. Any circuit connected to it must be fused
accordingly.
Table 3: VMX2 Series AC Control Power VA Requirements
VMX2…-BP
Model
PC
Boards
Fans
-BP: Bypass
Contactor
Inrush
-BP: Bypass
Contactor
Sealed
Recommended
minimum
CPT
Rating
VMX2-18 to 48
48
(inc. in PCB)
95
9
100
VMX2-62 to 112
48
(inc. in PCB)
220
17
250
VMX2-150 to 160
48
72
298
12.3
500
VMX2-210 to 276
48
100
380
11.6
500
VMX2-360 to 450
48
150
571
14
750
VMX2-550
48
200
1000
29
1000
120VAC
Supply
Figure 4.2.1
Control Power Supply Connection
TB-2
1
NC NO.C
1
A1 A2
2
NC NO.C
3
NO.C

VMX2Series Digital Solid State Soft Starter User Manual 18 | P a g e
4.2.2 Three-Wire Control Connection
For standard 3-wire control, connect dry (voltage free) contacts for the
Stop / Start buttons as shown on the diagram directly above the terminal
strip. Connect the N.O. contact of the Start button to Terminal 1 (far left
terminal), the common point between the Stop and Start to Terminal 2
(2nd from left) and the N.C. from the Stop button to Terminal 3 (3rd from
left).
▪4.2.2.a Seal In Contact
The VMX2 Series uses an internally pre-wired “seal-in” contact
around the Start button (Terminals 1 and 2). No external relay or
auxiliary output connection is necessary.
4.2.3 Two Wire Control: Relay / PLC Connection
An alternate connection for automated or unattended operation replaces
the start/stop push buttons by connecting a dry (voltage free)
maintained contact closure between terminals 1 and 3 as shown in
Figure 4.2.3. When this contact is closed, the VMX2 Series starter will
start and run. When it is opened, it is the same as a Stop command.
▪4.2.3.a Automatic Functions and 2-Wire Control
When using the Auto Reset functions (F052 - F053), special
consideration must be given to using 2-wire control. Refer to section
5.6.8 for details on using Auto-Reset functions.
▪Note:
When a maintained contact is used for start/stop, it is advisable to
set the overload relay to the manual reset position. This will prevent
the motor from restarting if the thermal overload trips and then cools
down.
CAUTION!
Control Terminals 1-10 of TB1 are configured using solid state
devices powered internally with a 24VDC power supply. To prevent
damage to the VMX2 Series control board, use dry (unpowered)
contact closures only when connecting to these terminals.
If existing 120VAC or other powered control circuit must be
interfaced, use isolating relays.
4.2.4 Interlock Connection
TB1 provides a connection point for an external dry (voltage free) N.C.
(Normally Closed) interlock device between terminals 4 and 5.
Examples where this interlock connection would be used include low oil,
high temperature, or excess vibration dropout from user supplied
devices. A factory-installed jumper is provided which allows the VMX2
Series unit to operate if external interlocks are not used. If this jumper is
removed and an interlock is not used, the VMX2 Series unit will not
function.