motortronics VMX-92-BP, VMX-28-BP, VMX-78-BP, VMX-62-BP, VMX-112-BP Installation & Quick Start Manual

MOTORTRONICS

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Solid State AC Motor Control

Solid State Soft Starter

VMX Series

Digital

18 – 1000A

Basic Installation and

Quick Startup Guide

Document #VMX-QSG604132MN

Firmware Revision 3.01

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Page 2 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Table of Contents

VMX Series

Digital Solid State Soft Starter
18 – 1000A

Quick Start “Minimum Settings” Guide 5
Chapter 1: Introduction

General Description, Sizes and Ratings ……… 6
Dimensions ……………………………………..… 7
Chapter 2 - Installation
Receiving, Unpacking and Inspection ………….. 8
SERVICE WARNING! ……………………...……. 8

Mounting Clearances and Cleaning ………….... 9

Power Connection and Terminations .……….… 10
Control Power Requirements …………………… 12
Control Connections …………………………….. 12

Chapter 3 – Sequence of Operation

Starting and Stopping …………………………... 16
18

Chapter 4 – Programming

Introduction …………………………………..…... 17
Digital Interface …………………………………… 17
Display and Program Modes ………… ………. 18
Program Function List …………………...………. 20
Fault Mode ………………………………………… 24
Chapter 5 - Motor Overload Protection
Solid State Overload Protection ………………… 25

Overload Class Trip Curves …………………..... 27

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Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Page 4 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Quick Startup “Minimum Settings” Guide

Your new VMX Series Soft Starter is factory preset for a wide variety of applications and often can be used with
minimal adjustment.

Try these initial factory presets first and then adjust or enable the more advanced features to meet your
specific starting needs.

Three Step Process:

1. Connect L1, L2, L3 to power lines and T1, T2, T3 to motor (see page 10)

2. Connect control wires and control power (see pages 12-13)

3. Program motor FLA (see page 18).

Your VMX unit is ready to start!

Start-up Check List

MOTOR FLA (F001)

must be programmed

for unit to operate!

 Supply voltage matches the rated supply voltage of the unit.
 Horsepower and current ratings of the motor and unit match or the unit is higher rating.
 Initial ramp time and torque adjustments have been checked.
 Power lines are attached to the unit input terminals marked L1, L2 and L3 (R, S, T).
 Motor leads are connected to the lower terminals marked T1, T2, and T3 (U, V, W).
 Appropriate control power is applied
 Control connections have been made.
 “Power on” light located on the front of the unit turns on when control power is applied.
 Four seven-segment LED readouts are visible.
 The motor’s FLA has been programmed in function F001.
 The thermal overload is properly set. (Use F003 and F004 to set OL Class.)
 The motor area and equipment are clear of people and parts before start-up.

This list provides only the bare minimum settings necessary to make your motor run,
and provides basic levels of motor protection. Safety precautions, listed further on in
this manual, must always be followed. Ramp setting adjustments and additional
protection features may be necessary. Please read further for additional details.

Page 5 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Chapter 1 - Introduction

General Description

The VMX Series is a digitally programmable solid state reduced voltage soft starter using a six SCR design. It
features a voltage/current ramp for smooth load acceleration. The SCRs are sized to withstand starting currents
of 350% for 30 seconds and up to 600% for 10 seconds for applications typical to NEMA / UL Class 10 overload
trip curves. The VMX Series features smooth stepless ramp control, which reduces motor inrush current and
excessive wear on the mechanical drive train components. The VMX Series includes a programmable 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 VMX Series. The VMX 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.

Sizes and Ratings

The Motortronics VMX Series starters are current rated controllers. Max. Am p

Model

Number

Min.- Max.

VMX-18-BP
VMX-28-BP
VMX-39-BP
VMX-48-BP
VMX-62-BP
VMX-78-BP

VMX-92-BP
VMX-112-BP
VMX-150-BP
VMX-160-BP

VMX-210-BP or -P
VMX-276-BP or -P
VMX-360-BP or -P
VMX-450-BP or -P
VMX-550-BP or -P
VMX-718-BP or -P
VMX-900-BP or -P

VMX-1000-BP or -P

Table 1: VMX Series selection

Current

Range

9 - 18
14 - 28
19 - 39
24 - 48
36 - 62
39 - 78
46 - 92

56 - 112
75 - 150

80 - 160
105 - 210
138 - 276
180 - 360
225 - 450
275 - 550
359 - 718
450 - 900

500 - 1000

ratings are for continuous duty and must not be exceeded. Always check the
motor nameplate FLA and Service Factor (if used) to ensure proper sizing.
Each size has an adjustable range of current from 50% to 100% of the Max Amp
rating. Table 1 below shows the Current Ratings available.

Units without Bypass
For NEMA 1 ventilated applications, or for OEM purposes where a bypass
contactor will be added by others, VMX-210 mo dels a n d above can be selected
without the integral Bypass by substituting the -BP suffix with a -P suffix.
See the Product Selection Guide for ordering details.

Examples:

• VMX-210-BP = open unit with integral bypass contactor for NEMA 12 / 4
end-user installati ons

• VMX-210-P = open unit with cooling fans and witho ut b ypass contactor ,
for use in NEMA 1 vented enclosures or OEM packages where a bypass
contactor is installed by others

Page 6 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Dimensions

Enclosure Model Number

VMX -18-BP

through
VMX -48-BP
VMX -62-BP

through

VMX -112-BP

Panel (open) with

integral bypass

contactor

Panel (open), fan

cooled, without

bypass contactor

VMX -150-BP and

VMX -160-BP
VMX -210-BP

through

VMX -450-BP

VMX-550-BP
VMX-718-BP

through

VMX-900-BP

VMX-1000-BP

VMX-210-P

through

VMX-1000-P

8.00 8.00 6.68 7.63 6.75 0.22

13.50 8.00 6.68 12.75 6.75 0.38

18.71 8.00 6.68 17.75 6.75 0.38

17.11 15.15 11.23 11.00 0.40

Under 210A, use –BP version as shown above

20.00 12.50 9.05 19.00 11.00 0.40

Overall Mounting

A B C D E F

CF CF CF CF CF CF

CF CF CF CF CF CF

CF CF CF CF CF CF

Table 2: VMX Dimensions ( subject to change)

Fdia.

A

~ ~

D

~

E

B

C

Figure 1: VMX Dimensions

Note: CF = Consult factory

Page 7 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Chapter 2 - Installation

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 sticker on the unit matches or is greater than the motor’s nameplate Full Load Current

(FLC or FLA) rating and Service Factor (if used).

Choosing a Location

Proper location of the VMX Series is necessary to achieve specified performance and normal operation lifetime.

The VMX Series should always be installed in an area where the following conditions exist:

Ambient operating temperature:

Panel (open chassis) unit: 0 to 50°C (32 to 122°F)

Enclosed unit: 0 to 40°C (32 to 104°F)
Protected from rain, moisture and dust. Enclosed units should not be exposed to 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.
Units with –BP Bypass Contactors produce less heat than units without. Throughout all sizes, maximum heat

dissipation of the VMX…-BP Series electronics, contactor coils and fans is less than 50W.
Units without the –BP Bypass Contactor (optional on 210A and above), must have ventilation adequate to

account for heat dissipation of the SCRs. This must be estimated at 4.5 watts per running load amp. For

example, on a 200HP 460V motor with 240FLA, the maximum heat dissipation of a starter w/o bypass will

be 240 x 4.5, or 1080 watts of heat. Enclosure ventilation (or air conditioning) must be capable of dispersing

this amount of heat.
Care should always be taken to maximize the available space inside of the enclosure. See “Clearances” below

or contact factory for assistance in sizing enclosures.

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.

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 actually short out electronics. After work is
complete, thoroughly clean, vacuum the area, and re-inspect the unit for foreign material.

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 Lock Out tags such as the
one shown when servicing equipment.

Page 8 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Clearances

When mounting into an enclosure, make sure there is sufficient clearance all around the unit for cooling, wiring
and maintenance purposes. To conserve panel space, the VMX Series –BP models were designed for clos e
horizontal clearances of only 1 inch (25mm) on either side. A minimum vertical clearance of 4” (100 mm) on the
top and bottom is necessary to maximize effective airflow and cooling, and 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. Wiring may require more clearance, particularly on the bottom.

1" minimum (2 5 mm)

4" minimum (100 mm)

VMX Series

Starter

1" minimum (25 mm)

4" minimum (100 mm)

Figure 2: VMX minimum mounting clearances

Cleaning:

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

Page 9 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Electrical connections

Power Terminations

All line and load power terminations are to be made to plated copper Bus Tabs located on each unit. Bus tabs
are pre-drilled to accept industry standard bolts.

The following power schematic provides the termination points as they are labeled on the unit. This is
diagrammatic only. All power terminations are physically located on the bottom of each unit. Refer to local code
standards for wire sizing and length.

Connect appropriately sized power conductors to the unit input terminals marked L1, L2, L3 (R, S, T for IEC
users). Avoid routing power wires over the control board or display. Note: If control power is present, but line

power is disconnected from L1, L2, L3, the disp lay will show [n3PH]

Disconnect

or

Circuit

Breaker

R /

S /

L1

L2

U /

V /

T1

T2

T /

VMX Starter.

L3

Solid State.

Over Load.

W /

T3

Integral
Bypass

Contactor*

G

indicating “no 3 Phase”.
Connect the motor leads to the unit load terminals marked T1, T2, T3

(U, V, W for IEC users). Soft Starters such as the VMX Series cannot
operate without a load, even for testing. The VMX Series will trip on
“Phase Loss” if any or all of the conductors are disconnected from the
load terminals. Contact the Factory for assistance in no-load testing.

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.

Bypass Contactor
*Bypass Contactors are integral (built-in) on all VMX…-BP (panel

mount), and all VMX…–E (NEMA 12 enclosed) versions.

Power Factor Correction Capacitors

Power factor correction capacitors can be connected to motors
controlled by VMX Serie s 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.

MTR

Figure 3:

VMX Power Connections

Grounding / Earthing

Connect the ground cable (PE) to the ground terminal as labeled “G” on the unit. Refer to the National Electrical
Code or your local code for the proper ground wire sizing and be sure that the ground connector is connected to
earth ground. In ungrounded systems, it is not necessary to connect a ground to the unit however local codes
should always be consulted.

Page 10 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Power Terminals:

Line and Load terminals are bus tabs with pre-drilled holes (see Table 3). Use of appropriate compression or
mechanical lugs for wire connection to these bus tabs is required or highly recommended. For convenience
only, some sizes (as indicated below) come with saddle clamps that can be used directly on stranded wire
without additional lugs, but may not be suitable if larger conductors are needed for voltage drop reduction.
Suggested wire sizes and tightening torques shown in the chart below are for reference when using 75°C rated
conductors. Always consult local codes and industry standard practices for proper wires sizes to accommodate
voltage drop and ambient conditions.

.

Model

Number

VMX-18-BP
VMX-28-BP
VMX-39-BP
VMX-48-BP

VMX-62-BP
VMX-78-BP

VMX-92-BP
VMX-112-BP
VMX-150-BP
VMX-160-BP

VMX-210-BP or -P
VMX-276-BP or -P
VMX-360-BP or -P
VMX-450-BP or -P
VMX-550-BP or -P
VMX-718-BP or -P
VMX-900-BP or -P

VMX-1000-BP or -P

Current

Range

Min.- Max.

9 - 18 12 6
14 - 28 10 10
19 - 39 8 16
24 - 48 6

36 - 62 4 25
39 - 78 3 35
46 - 92 2 35

56 - 112 2
75 - 150 0 70

80 - 160 2/0
105 - 210 4/0 120
138 - 276 300 kCMIL 150
180 - 360 500 kCMIL 300
225 - 450 2 x 250 kCMIL 2 x 150
275 - 550 2 x 250 kCMIL

356 – 718 CF CF
450 – 900 CF CF

50 - 1000 CF CF

Suggested

Wire Size

AWG

Tightening

Torque
in.-lbs.

35

45

80

200

Screw / Bolt

Size

0.22” hole

(5.58mm) for

#10 (or M5)
screw / nut /
lock washer

(not included)

1 x M8

(included)

1 x M8

(included)

1 x 0.38" hole

(M10)

for User

supplied

lugs

CF CF CF
CF CF CF
CF CF CF

Tightening

Torque

Nm

4

5

9

22.6

Suggested

Wire Size

ISOmm2

16

50

70

2 x 150

Table 3: VMX Series Wire Ranges and Torque Specifications CF = Consult Factory

Page 11 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Control Connections

Control connections on the VMX 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.

TB1: 12 terminals, #1-12

N C

RAM P2

JOG

PTC

OPTO

TB2: 10 Terminals, #13- 22

1

NC NO. C

2

NC NO. C3NO. C

1

A1 A2

1 2 3 ............................................... 11 12

13 14 ...........................19 20

24VDC from internal supply

= Factory inst al led jumpers

Opto-Isolated Triac Swit ch

10-250VAC/DC 50mA max.

240VAC max. fr om

customer sou rce

120VAC Contr ol Po w er
(or 240VAC if order ed)

Figure 4: Control Terminal Blocks

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.

AC Control Power Supply Connection

Separate AC Control Power supply is required to power the electronics of the VMX Series starter. 120VAC is
standard, order 240 VAC (optional) 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 5 (these are also Terminal #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.

Control Power Requirements

1

NC NO. C

2

NC NO. C3NO. C

120VAC

Supply

1

A1 A2

When sizing a control power transformer for the VMX…-BP Series

Control Power Supply Connection

Figure 5:

TB-2

starter use the chart below for minimum sizes or supply capacity. Any
additional control devices powered by the same CPT must be added
to the above to ensure proper operation of the Bypass Contactor.

AC Control Power VA Requirements

VMX …-BP

Model

VMX-18 to 48 48 (inc. in PCB) 95 9 100
VMX-62 to 112 48 (inc. in PCB) 220 17 250
VMX-150 to 160 48 (inc. in PCB) 298 12.3 500
VMX- 210 to 276* 48 100 380 11.6 500
VMX-360 to 450* 48 150 571 14 750
VMX-550* 48 200 1000 29 1000

Table 4: VMX Series Control Power Requirements
Note: * -P versions (w/o bypass) still require PCB and fans, plus user supplied bypass (if any).

PC

Boards

Fans

-BP: Bypass
Contactor

Inrush

-BP: Bypass
Contactor

Sealed

Recommended

minimum

CPT

Rating

Page 12 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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Control Fusing
Output relays in TB2 must be protected from currents in excess of 5A, either with a fuse or with 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/DC. Any circuit connected to it must be fused accordingly.

Three-Wire Control Connection

For standard 3-wire control, connect dry (voltage free) contacts of the Stop / Start buttons as shown on the
diagram directly above the terminal strip. Connect the NO contact of the Start button to Terminal #1 (far left

N C

RAM P2

JOG

PTC

OPTO

terminal), the common point between the Stop and Start to Terminal

nd

#2 (2

from left) and the NC from the Stop button to Terminal #3 (3rd

from left).

1 2 3

Connect 3 wire

control here

as shown

Figure 6:

3 Wire Control Connection

TB-1

Seal In Contact

The VMX 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.

Two Wire Control: Relay / PLC Connection

An alternate connection for automated or unattended operation replaces 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 VMX Series starter will start and run. When it is
opened, it is the same as a Stop command.

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 off.

1 2 3

Connect 2 wire

contr ol / PLC

output here

RAM P2

N C

JOG

Figure 7:

2 Wire Control Conn ection

TB-1

PTC

OPTO

CAUTIO N!

Control Terminals 1-10 of TB1 are a 24VDC circuit from an internal power supply of the VMX
Series. Use dry (voltage free) contact closures only. Applying any voltage to these terminals will

result in damage to the control board. If existing 120VAC or other powered control circuit must be
interfaced, use interposin g r elays or control the VMX Series with 2 wire control as shown above.

Interlock Connection:

TB1 provides a connection point for an external N.C. (Normally Closed) interlock device between terminals 4
and 5. A factory installed jumper is provided which allows the unit to operate if external interlocks are not used.

RAM P2

N C

4 5

External Interlock Connection

JOG

Remove factory jumper

and connect external
interl ock device here

Figure 8:

TB-1

PTC

OPTO

not function.

If this jumper is removed and an interlock is not

used, the unit will

Page 13 of 27

Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

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PTC Thermistor Input

The VMX Series starter is provided with input terminals for connecting a PT C (Po s itive Temperature
Coefficient) Thermistor that may be imbedded in the motor. These are specialized resistors imbedded in some

motor windings that increase resistance as the temperature

RAM P2

N C

JOG

PTC

OPTO

increases. When the VMX Series detects that the PTC input
resistance is too high, it initiates a PT C trip, and disp la ys it on the

9 10

**

readout as [ PTc]. This is independent of the Thermal Register
overload current protection and pr ovid es supp lemental protection
for high motor ambient temperature applications. Terminals for this

PTC Resistor in Motor

input are provided with a factory jumper that must be removed if the
PTC input is used. These terminals are located on TB1, Terminals 9

Figure 9:

PTC Resistor Connection

TB-1

+

** Remove factory jumper
from Terminals 9 and 10

and 10.
Resistance must be less

than or equal to 750 Ω at 25ºC. If multiple
resistors are used in the motor, the sum of all resistors in series
must equal or be under this value.

Fault Signal

An optically isolated Triac output is dedicated as a fault indicator on TB1, terminals 11 and 12. The output Triac
switch is rated for 10 - 250 VAC/DC, 50 mA (maximum). If the three programmable Output Auxiliary Relays are

N C

RAM P2

JOG

PTC

OPTO

being used for other functions, this output can easily be hooked up
to a PLC or small external relay to provide a Fault signal. This Fault
Output operation is permanently fixed at “Any Trip”, duplicating the

11 12

Relay setting #16 as shown in Table 5.6.10.

Control Power or PLC Source

Fault Output Opto-Triac Connection

Figure 10 :

TB-1

R

External Fau lt Relay

or PLC Input

This output is permanently set to this function and is not
programmable.

Dual Ramp and Jog Features

TB1 includes provisions for enabling the Dual Ramp and Jog functions by using external contact closures. Both
features use a common +24VDC from Terminal # 7, however they can be used independently of each other or

N C

RAM P2

JOG

PTC

OPTO

together. See sections 5.6.2 and 5.6.3 of the Advanced Installation,
Operation and Programming Manual for full function descriptions and
setup.

6 7 8

RUN JOG

RAMP 1 RAMP 2

Figure 11:

Dual Ramp / Jog Connections

TB-1

Page 14 of 27

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Output (Auxiliary) Relay Contacts

Dry relay output contacts from three programmable auxiliary relays are available on TB2. Outputs #1 and #2 are
Form C (SPDT), with a Common, N.O. and N.C. Output #3 is a Form A, (SPST), N.O. contact. Motortronics

recommends fusing all contacts with external fuses.

Internal Connections

The relays are rated for 240 VAC, 5 A and 1200 VA.
Factory default settings for these relays are as follows:

K3

K5K4

AUX 1 – Run / Stop (see F060) This contact changes state upon a

Start command, returns to normal on Stop (or Begin Decel if active).
AUX 2 – At-Speed / Stop (see F061) This contact changes state upon

the VMX Series detecting At-Speed, and returns to normal on Stop.
At-Speed is determined by the VMX Series detecting the current

1

NC NO. C

2

NC NO. C3NO. C

1

A1 A2

dropping after reaching End-of-Ramp, or a maximum of 30 seconds
after Start.

AUX 3 – Any Trip (see F062) This contact closes when any trip

13 14 15 16 17 18 19 20

AUX.

RELAY #1

AUX.

RELAY #2

Figure 12:

Auxiliary Relay Connections

TB-2

AUX .

RELAY #3

condition # 5 – 15 (as defined in Table 8) occurs.

All relays can be reprogrammed for a wide variety of functions.
See Section 8 for additional relay programming details.

Note:

It is not necessary to use the programmable output auxiliary relays in the Start / Stop circuit. An
internal seal-in relay is provided elsewhere (see “Three Wire Control Connections” above).

Bypass Contactor Control

On VMX…-BP version (and NEMA 12 enclosed) starters, an internal dedicated connection is used at the factory
for automatically controlling the Bypass Contactor. Field wiring for Bypass Contactor operation is not required.
On units 210A and above ordered without a Bypass Contactor (-P version), the dedicated bypass control
terminals are available for customer use, or any of the above Aux. Relays can be programmed for “At-Speed”
operation.

Independent control of the bypass contactor is available for emergency use. See section 4.2.9.a of the
Advanced Installation, Operation and Programming Manual for details about how to use this feature.

Bypass Control

Terminals

18 - 160A Units

Bypass Control

Terminals:

210 – 1000A without

integral bypass

Page 15 of 27

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Chapter 3 - Sequence of Operation

Starting:

1. Apply three phase power to the unit. The motor should not run until a Start command is applied.

2. Apply control power and check that the “Power On” LED comes on.

3. Status Display should read [0000.] showing no current in Phase A (minor flickering of the first digit is
common).

4. Apply the Start (Run) command. The motor should begin to accelerate. Status display will read Phase A
Amps at an increasing rate.

5. When the motor reaches full speed, the “At Speed” LED comes on and the Bypass Contactor will close.
Status display should show a sharp decrease in Phase A Amps.

6. If the motor does not fully accelerate, decelerates, or stops during the acceleration period, hit the Stop
button immediately and open the disconnect line.

Stopping:

If Pump-Flex Decel is Disabled

7. Remove the Run Command (or hit the Stop button).

8. At-Speed LED will go out and Bypass Contactor will open. Status display should read [0000.] indicating
no current on Phase A.

9. Motor will coast to a stop according to load inertia and friction.

If Pump-Flex Decel is Enabled

7. Remove the Run Command (or hit the Stop button).

8. At-Speed LED will go out and Bypass Contactor will open. Status display should briefly read Phase A
Amps increasing

9. Motor should begin to slow down. Status display should begin to show decreasing

10. When motor reaches Stop Level, VMX should turn off. Status display will again show [0000.]

If the unit does not follow this operational sequence please contact the factory refer to the VMX Series
Troubleshooting Guide.

as motor begins to decelerate.

(factory default) in F024:

in F024:

motor amps.

Page 16 of 27

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Chapter 4 - Programming

It is best to operate the motor at its full load starting conditions to achieve the proper time, torque and ramp
settings. Initial factory settings are set to accommodate general motor applications and provide basic motor
protection. Advanced features must be enabled via programming. The only parameter that MUST be set by the
user is motor FLA (F001).

Digital Interface

The VMX Series Soft Starter includes an intuitive, digital keypad with eight LEDs, seven command keys, and an
LED display with four alphanumeric digits.

Keys

Green

LEDs

Figure 13: VMX Operator Interface

Yellow

LEDs

Display

Table 5: VMX Series Display Features

Reset Clears the Trip indication and releases the Trip Relay.

Fn Enters or exits the Program Mode.

Navigates through the Status Display Mode, scrolls up

Up and

Down

Arrows

Right

and Left

Arrows

Power

On

At

Speed

Shunt

Trip

Shorted

SCR

Over

Current

Phase

Loss
Over

Temp

Over
Load

8888.

and down through the Function List, increases or
decreases the value of the active (flashing) digit and
scrolls through the fault history. When entering values,
holding the key down for more than 2 seconds will
activate Auto-step, which increases it’s rate the longer
the key is held down.

Each keypress shifts the active (flashing) digit t o the
right or left by one position, allowing you to change
higher values of functions without waiting to Auto-step
though large numbers.

Control power is available at A1 and A2
The motor is at full power and the Bypass Contactor

has been commanded to pull in.
The SCRs are at full conduction and current has

dropped.
Two or more SCRs in opposing phases have shorted,

and power is flowing to the motor in the Off mode. See
section 8 for additional concerns.

There is no voltage drop across at least one SCR
phase assembly, indicating that at least one SCR is
shorted. See section 8 for additional concerns

Overcurrent LED lights for three sets of fault conditions:

1) During start, the unit saw current exceed the
normal rate of increase in the first 250ms.

2) During Run, current exceeded either the OC
setting in F042 for the delay set in F043. This
LED will be accompanied by oCA, oCC or
oCd on the display.

3) The unit has seen a Short Circuit exceeding
10x FLA for 12.5ms. This LED will be
accompanied by SCA, SCC or SCD display.

One or more of the phase currents dropped below the
threshold during starting or running.

Starter has tripped due to excess heat sink
temperature. This will automatically reset.

Starter has tripped due to the Thermal Register
reaching 0000. The Overload must reset before this
fault can be cleared.

4 digit 7 segment display with a decimal point on the
right side indicating Phase A.

Page 17 of 27

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Display Modes:
There are three modes of display: the Status Display Mode, the Program Mode, and the Fault Mode.

Status Display Mode

(Default Display)
The Status Display Mode displays seven “screens” of information. Motor Currents (3 phases), Remaining
Thermal Capacity, Ground Current, Remaining Time on the Process Timer, and Time Base of the Time Clock
Controller. This is also the entry screen for going into the Program Mode.

 [0000.] The initial display on power up is four digits and the decimal. This indicates the motor current for

Phase A of the motor.

 [0000] Scroll UP to display four digits only (no decimal). This indicates the motor current for Phase B. While

viewing Phase B, press the UP arrow again to view Phase C current.

 [G000] Scroll UP to display the “G”. This indicates that this value is the current flowing to ground on the motor

leads.

 [H000] Scroll UP to display the “H”. This indicates that this value is the remaining thermal capacity percentage

of the motor (i.e. H070 = 70% remaining thermal capacity)

 [0000] Scroll UP again to display the Process Batch Timer (described in Section 5.6.7). If this entire screen is

flashing, the Timer is active.

 [00.00] Scroll UP to display two pairs of digits separated by a point: This indicates the time base of the Time

Clock Controller (described in section 5.6.7 of the Advanced Installation, Operation and Programming
Manual). If the display shows [00.00], the TCC is not enabled. This follows the time settings in F075 – F080.

Program Mode

The starter must be OFF in order to enter the Program Mode. Changes cannot be made while running.
Use the Program Mode to view or change Function (Fn) settings. To enter the Program Mode, press the [Fn]

key once from the Status Screen as described above. The first time you enter the Program Mode after power
has been cycled to the starter, the initial function [F001] should display with the selected digit flashing. If the
VMX Series starter has been programmed and power to the unit has not been cycled, the readout will display
the last function viewed or changed. To change to a different function, use the arrow keys.

Viewing Function Programming and Values

The programming of each individual Function can be viewed without making changes (values can also be
viewed in the Run Mode, however no changes can be made). Each Function is signified by the letter “F” in
beginning of the data, the 4 digit value of the function follows after hitting the [R EAD/ENTER] key

 [F001] The “F” indicates the programmable Function.
 [0000] This is the present setting of the applicable function. This display may include decimals between digits

depending on the function setting’s range and inc r em enta l steps.

 Pressing the [Fn] key again will return to the Function display without making changes.
Changing a Function’s Set Value

From the instructions above, after hitting the [READ/ENTER] key the display will show the value of that function
with one digit flashing (usually the rightmost digit). Flashing indicates this is the digit to be altered (similar to
cursor position). Use the UP arrow key to increment the value of the flashing digit. Use the DOWN arrow key to
decrement the value of the flashing digit. Use the LEFT or RIGHT arrow to select the next digit to be altered.
Values can only be changed within the Adjustment Range of the function parameter.

 Pressing the [READ/ENTER] key again will store the new programming for that Function and return to the

Function display.

 If the display shows [Inh] when trying to store the changes, the unit is running and must be Stopped, or a

Password has been set up to prevent access and must be entered first. See section 5.6.12 of the Advanced
Installation, Operation and Programming Manual for details about this feature.

Caution! If the Fn key is pressed or power is lost before

the [READ/ENTER] key is pressed,

the VMX Series Starter will not store the new value in memory.

Page 18 of 27

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Example 1: Figure 14

Entering a new FLA setting into Funtion 1

[0000.] Indicates Phase A is drawing no current

Example 1: Setting the Motor FLA

(unit is in Off mode).

Press the [Fn] key

on a VMX-48 to 36A

[F001] Indicates this is Function 001 (Motor FLA).

Press [READ/ENTER] key

to view the F001 value

[0048] Indicates the programmed motor FLA is 0000

Amps, the factory default for a new unit that has
not yet been in service. The farthest left digit (0)
is flashing, indicating that this is the digit that
you will alter (cursor posit ion).

Press
Key...

Fn

Display
Shows...

0000.
F001

Me a ns...

Phase A
Current

Function #1
Selected

Press the UP Arrow key once

to increase this digit value

[0024] Indica tes you ha ve inc reased the value to 24A,

the lowest setting for a 48A unit, which is 1/2 of
the Max. Amps (see Note).

READ

ENTER

0000
0024

Default Setting
of Function #1

Lowest value
for this un it

Press the UP Arrow key twice (2 x)

to increase this digit value

[0026] Indicates you have increased the far left digit

value from 4 to 6,

Press the LEFT Arrow key

x 2

0026

0026

Lowest value
for this unit

Cursor (flashing)
Position Shift

to shift left to the next digit

[0026] The second digit from the left is now flashing,

indicating a new cursor position.

Press the UP Arrow key

to increase this digit value

nd

[0036] Indica tes you ha ve inc reased the 2

to left digit
to a value of 3 (10’s place), indicating a final
setting value of 36A

READ

ENTER

0036

End

F001

New Value of
Second Digit

Value Accepted
(flashes once)

Return to
Function # Display

Press [READ/ENTER] key

to store the new value

[End] The word “End” will flas h briefly to indicate that

Fn

0000.

Returns to Default
Display, Phase A
Current

the new value has been entered and accepted.
After flashing once, the display will revert to
showing the Function number

Press the [Fn] key

[0000.] Returns to the Default Display, indicating Phase

Figure 14:

Changing a Fu nction Value

A is drawing no current

Note: When first entering FLA into a new unit, pressing the Up arrow key will jump the readout value

immediately to ½ of the unit Max. Amp rating, and it will never go below that again. Any unit
thought to be new which has a value other than 0000 in F001 upon setup, has been programmed
previously and should be reset to factory defaults before proceeding.

Page 19 of 27

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VMX Series Basic Start-up Parameters and Factory Defaults

Fn # Function Description Adjustment / Display Range

F001

F002

Motor Nameplate FLA
FLA must be programmed for
starter to function.

Motor Nameplate
Service Factor

50-100% of Max Amp Rating.
Upper limit of range automatically adjusts downward as Service
factor is increased.

1.00 - 1.30 (SF) 0.05 1.0 (SF)

Setting

Increments

1 amp 0

F003 Overload Class During Start NEMA / UL Class 5 - 20 5 Class 10
F004 Overload Class During Run NEMA / UL Class 5 - 30 5 Class 10

0 = Manual

F005 Overload Reset

1 = Auto

1

2 = Disabled Overload

F006-

Reserved for factory use

F009

Factory

Setting

0

(Manual)

F010

Ramp Type Selection:
VR = Voltage Ramp
CR = Current PID Ramp
1 = Ramp 1, 2 = Ramp 2

Setting 1 = VR1 + VR2
Setting 2 = CR1 + CR2
Setting 3 = VR1 + CR2
Setting 4 = CR1 + VR2

1

1

VR1+VR

2

F011 Initial Torque (VR) of Ramp 1 0-100% Line Voltage 1% 60%
F012 Initial Torque (CR) of Ramp 1 0-600% Motor Current
F013 Accel Ramp Time of Ramp 1 1-120 seconds 1 second
F014 Max Current Limit of Ramp 1 200 - 600% Motor Current

1% 200%

10

seconds

1% 350%
F015 Initial Torque (VR) of Ramp 2 0-100% Line Voltage 1% 60%
F016 Initial Torque (CR) of Ramp 2 0-600% Motor Current
F017 Accel Ramp Time of Ramp 2 1-120 seconds 1 second
F018 Max Current Limit of Ramp 2 200 - 600% Motor Current

F019
thru
F023

Jog and Kickstart Features

These features are disabled from factory. See Advanced
Installation, Operation and Programming Manual, section 5.6.3 for
details.

1% 200%

10

seconds

1% 350%

0 = Disabled (coast to stop)

F024

Pump Flex Control /
Deceleration Ramp

1 = Enabled, except after OL trip
2 = Enabled, continued Decel even

1

0

Disabled

if there is an OL trip

F025

Begin Decel Level (BDL),
Immediate Drop Down Torque

0 - 100 % of Output Voltage 1% 60%

F026 Decel Shut Off Voltage 0 to (BDL minus 1)% Voltage 1% 30%

F027 Decel Ramp Time 1 – 60 Seconds 1 second

F028

F029

Restart Delay Time
(Sequential Start Delay)

Reserved for Factory Use

0 = Disabled, or
1-999 seconds after a Power Loss (Status can be read in F054)

Page 20 of 27

1 second

10

seconds

0

Disabled

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Fn # Function Description Adjustment / Display Range

F030

thru

Process Timer Functions

F039
F040

Current and Ground protection

thru

features

F047

F048

thru

Duty Cycle Lockout Timers

F050

F051 Internal Protection Settings

F052

Auto Reset
on Selected Faults

See Advanced Installation, Operation and Programming Manual,
Appendix 4 for details.

These features are disabled from factory. See Advanced
Installation, Operation and Programming Manual, section 5.6.8 for
details.

These features are disabled from factory. See Advanced
Installation, Operation and Programming Manual, section 5.6.9 for
details.

1 – 63
See“ F051 Definition Table”

Fault Preferences 1 – 12
See Table 5.6.8:
”Auto-Reset Selected Faults”

Setting

Increments

1

1

F053 Auto Reset Attempts 0 = Disabled, or 1-10 attempts 1 0

F054

Time and value displays for

thru

lockouts in F048 – F050

F059

F060 Aux Relay 1 setting

F061 Aux Relay 2 setting

F062 Aux Relay 3 setting

F063

Aux. Relay Delay Timer
(for Operations 22-26)

Read only, no settings

Operation # 1 – 26: see
”Aux. Relay Settings Table” below

Operation # 1 – 26: see
”Aux. Relay Settings Table” below

Operation # 1 – 26: see
”Aux. Relay Settings Table” below

1 1

1 2

1 16

0 (Disabled), or 1-999 seconds 1 second

Factory

Setting

63

Enable

all

4,

Phase

Loss

only

0

No Delay

F064 Reserved for factory use

F065

thru

Communications features

F068

These features are disabled from factory. See Advanced
Installation, Operation and Programming Manual, section 5.6.11
for details.

1 0

F069 Reserved for factory use

F070

Parameter Lock
Customer Password

0 – 999
0 = Disabled
Any Other Numbers = Password

1 0

0 = Disabled

F071 System Clear / Reset

1 = Clear THR and Lockout Timers

1 0

2 = Reset to Factory Default Settings

F072

thru

Reserved for Factory Use

F074

Page 21 of 27

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Fn # Function Description Adjustment / Display Range

F075 Real Time Clock - Year 2000 - 2047 1 year 2000
F076 Real Time Clock - Month 1 - 12 1 Month 1
F077 Real Time Clock - Day 1 - 31 1 Day 1
F078 Real Time Clock - Hour 0 - 23 1 Hour 0
F079 Real Time Clock - Minute 0 - 59 1 Minute 0
F080 Real Time Clock - Second 0 - 59 1 Second 0
F081 Revision # - -

F082 –

Reserved for factory use

F084

F085

thru

Read Only No settings 1 0

F097
F085

thru

Read Only No settings 1 0

F097

Setting

Increments

Factory

Setting

Factory

Setting

Function 51 Internal protection features

Several protection features in the VMX Series are accomplished with internal hardware and use software
switches in Function 51 to enable or disable them. The following chart shows these functions and the factory
default settings. Refer to the Advanced Installation, Operation and Programming Manual, Section 5.6.9.a for
details on how to change these settings.

Protection

Function

Phase Rotation
Trip

Expected Phase
Sequence

Phase Current
Loss

Shorted SCR
Lockout

Shunt Trip

PTC Input Trip PTC Trip function. This can be disabled so that a jumper is not required across the PTC inputs. On

Line Loss Trip

Table 7: Function 51 table of Hardware Protection Features

Phase Rotation protection.
Phase rotation mu st match selection in Bit #2 below . Se ttin g to Off (0) will make the VM X
insensitive for use behind a reversing contactor

2 = A-B-C Phase Rotation Sequence Only
0 = A-C-B Phase Rotation Sequence Only

Phase Current Loss, any phase current reading is less than 12% of unit max amp rating after 3
seconds from Start command.

At least one SCR has shorted; there is no voltage drop across the SCR phase assembly. On
Shunt Trip of the main Circuit Breaker or Isolation Contactor (if provided and wired to an Aux.

relay in F060-F061)). 2 or more SCRs have shorted in opposing phases so current was flowing
to the motor while the VMX was in the Off state.

Protection against loss of input line voltage. Disable when using an In-Line Isolation Cont actor
or any other system that normally removes line power from the starter. Resets automatically
when line voltage returns.

Description

Default
Setting

On

A-B-C

Rotation

On

On

On

Page 22 of 27

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Aux. (Output) Relay Settings

Functions F060 through F062 provide the ability to program the functions of each of the 3 Output Auxiliary
Relays. Factory default programming is provided which covers a wide variety of applications, but any of these
relays can be changed as per the following chart.

Notes:

Check relay wiring before changing programming to avoid unintended consequences.
Relays programmed to some protection features will not operate if function is disabled elsewhere.

Setting

10 Short Circuit Trip 23 Run / Stop with On-delay from F063
11 Current Unbalance Trip 24 At Speed / Stop with On-delay from F063
12 Over Current (Shear-Pin) Trip 25 At Speed / End of Decel w/ On-delay from F063
13 Under Current Trip 26 Start / End of Decel with On-delay from F063

Table 8: Aux. Relay Settings

Relay Operation Description

1 Run / St op (Changes on Start, resets on Stop) 14 Ground Fault Trip
2 At Speed / Stop 15 Phase Rotation Trip
3 At Speed / End of Decel 16 Any Trip (#5 - #15)
4 Start / End of Decel 17
5 Short SCR Trip 18 Coast Down Time Lockout
6 Phase Loss Trip 19 Starts Per Hour Lockout
7 Shunt Trip 20 Time Between Starts Lockout
8 OL (Motor Thermal Overl oad) Tri p 21 Any Lockout (#18-#20)
9 OT (Starter Therm al Over Temperature) Trip 22 Run Timer (F030) Engaged

Setting

*Note: Flash rate for Setting #17 is ½ second On and Off

Relay Operation Description

Any Trip, (#5-#15) flashing output*

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Fault Mode

The VMX Series will automatically enter the Fault Mode when a fault occurs in the motor or starter and display
a code indicating the condition that caused a shutdown. Fault codes are three-digits in length and are displayed
in alpha characters. The first and second characters (reading left to right) are the initials for the applicable
English-language fault name. The third or right-most character can be either A, c, or d to denote when the fault
occurred. “A” denotes Acceleration. “c” denotes Constant speed. “d” denotes Decel.

A Fault History of the past 3 events is stored and can be accessed by using the Up or Down Arrow keys before
pressing the Reset button. The first (newest) event is indicated by the decimal point in the lower right corner. A
more detailed history with time and date stamps is also kept in Functions 85 through 93.

Fault Codes:

Basic common fault codes are shown in the chart below. For additional details refer to Chapter 7 of the
Advanced Installation, Operation and Programming Manual, or contact the factory for assistance.

Fault Condition Description

Over Current during Accel; Const spd; Decel ocA; occ: ocd
Phase Loss during Accel; Const spd; Decel PLA; PLc; PLd
Over Temperature during Accel; Const spd; Decel otA; otc; otd
Over Load during Accel; Const spd; Decel oLA; oLc; oLd
Shorted SCR during Accel; Const spd; Decel SSA; SSc; SSd
Shunt Trip during Accel; Const spd; Decel st
Current Imbalance during Accel; Const spd; Decel IBA; Ibc; IBd
Under Current during Accel; Const spd; Decel UcA; Ucc; Ucd
Short Circuit during Accel; Const spd; Decel ScA; Scc; Scd
Ground Fault during Accel; Const spd; Decel GFA; GFc; GFd
Bypass Discrepancy during Accel; Const spd; Decel BP A; BPc; BPd
PTC Trip during Accel; Const spd; Decel PtA; Ptc; Ptd
Rotation Trip during Accel; Const spd; Decel RtA; rtc; rtd

Additional codes that may be displayed

Display Code

Readout

nFLA No Full Load Amps set in F001

Inh

n3Ph No 3 Phase: No input line voltages on one or more phases

Loc

Err

Table 7.1: Fault and Display code list

Inhibit: Starter is still Run mode when you are attempting a change i n programming, or the starter

has Password Protection enabled and you have not entered the password code.

Lockout: The unit has tripped on Overload and you are attempting to Reset before it is ready,
or one of the Duty Cycle Lockout protection features has been enabled.

Error: You are attempting to enter an invalid password

Fault Display Code

Readout

Condition Description

Fault Number Code

used in History,

F085, F088 and

F091

1; 2; 3 Over Current
4; 5; 6 Phase Loss

7; 8; 9 Over Temp
10; 11; 12 Over Load
13; 14; 15 Short ed SCR
16; 17; 18 Shunt Trip
19; 20; 21 --­22; 23; 24 --­25; 26; 27 Over Current
28; 29; 30 --­31; 32; 33 --­34; 35; 36 Over Load
37; 38; 39 ---

LED

Indicator

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Chapter 5 - Motor Overload Protection

Solid State Overload Protection

The VMX Series Starter provides true U.L. listed I
main digital processor for maximum motor protection. It simulates 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
be easily programmed for different trip curves.

Thermal Memory

The VMX 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
VMX Series does not “forget” that the motor has been running even if power to the starter is turned off and back
on. Continuous overload protection is provided based on the true thermal condition of the motor.

Thermal Capacity

The Thermal Register is displayed as a percentage. This percentage is the motor’s remaining
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.

Examples:

H 100

100% Thermal Capacity

remaining at rest

H057

57% Thermal Capa c ity
remaining after starting

(43% used)

Note:

All VMX 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 VMX
Series without entering the motor nameplate FLA, the starter will Fault and the display will read
“nFLA” (no Full Load Amps).

Disabling the Overload Protection

The Overload Protection feature can be disabled if necessary. Please refer to the Advanced Installation,
Operation and Programming Manual for instructions and considerations before disabling the Overload
Protection

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.

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 get to this display as well.

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).

2

t Thermal Overload Protection as a built-in function of the

thermal capacity.

Page 25 of 27

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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 glow solid. When the motor cools
down, the LED will begin to flash, indicating that the Overload Trip can be reset.

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 VMX Series has
reset itself after the cool down period.

WARNING!

Two-wire control systems may restart without warning when Auto Reset 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

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.

Dual Overload Trip Curves

The VMX 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.

Starting Overload Trip Curve

During the start mode, Overload Trip Curves are selectable from NEMA Class 5 through Class 20 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.

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.

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Basic Installation and Operation Guide VMX Series Digital Solid State Soft Starters 18 – 1000A

Phone: [phone] - Fax: [phone] - Web: www.clrwtr.com - Email: [e-mail]

Overload Trip Curve Chart

Figure 15: VMX Series Overload Trip Curves

Overload Protection During Bypass

When a Bypass Contactor is used to shunt power around the SCRs in the VMX Series (as in the VMX…-BP
version), overload protection is maintained as long as the VMX Series is directly controlling the contactor. No
additional Overload Relay is necessary for normal operation.

Special Consideration for Across-the-Line (Direct-on-Line) Contactors

When the Bypass Contactor on a VMX…-BP Series has been selected to be used for Across-the-Line restart,
supplemental overload protection may be necessary. For this application, refer to the External Overload Relay
Applications supplement and wiring diagram in Appendix 5 and section 4.2.6.a of the Advanced Installation,
Operation and Programming Manual for detailed instructions.

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