AC Tech SCD Operation Manual

A

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C Tech

Variable Speed AC Motor Driv es

SCN Series

Installation and Operation Manual

THE SCN SUB-MICRO DRIVE

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INPUT POWER TERMINALS

GROUND
LUG

ELECTRONIC
PROGRAMMING
MODULE (EPM)

PROGRAMMING
BUTTONS

CONTROL
TERMINAL
STRIP

2-DIGIT LED
DISPLAY

OUTPUT (MOTOR) TERMINALS

1.0 GENERAL

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1.1 PRODUCTS COVERED IN THIS MANUAL

This manual covers the AC Tech SCN Series Variable Frequency Drive.

1.2 PRODUCT CHANGES

AC Technology Corporation reserves the right to discontinue or make modifications to the design of
its products without prior notice, and holds no obligation to make modifications to products sold
previously. AC Technology Corporation also holds no liability for losses of any kind which may result
from this action.

1.3 WARRANTY

AC Technology Corporation warrants the SCN Series AC motor control to be free of defects in material
and workmanship for a period of twelve months from the date of sale to the user, or eighteen months
from the date of shipment, which ever occurs first. If an SCN motor control, under normal use,
becomes defective within the stated warranty time period, contact AC Technology's Service Department
for instructions on obtaining a warranty replacement unit. AC Technology Corporation reserves the
right to make the final determination as to the validity of a warranty claim, and sole obligation is to
repair or replace only components which have been rendered defective due to faulty material or
workmanship. No warranty claim will be accepted for components which have been damaged due to
mishandling, improper installation, unauthorized repair and/or alteration of the product, operation in
excess of design specifications or other misuse, or improper maintenance. AC Technology Corporation
makes no warranty that its products are compatible with any other equipment, or to any specific
application, to which they may be applied and shall not be held liable for any other consequential
damage or injury arising from the use of its products.

This warranty is in lieu of all other warranties, expressed or implied. No other person, firm or
corporation is authorized to assume, for AC Technology Corporation, any other liability in
connection with the demonstration or sale of its products.

1.4 RECEIVING

Inspect all cartons for damage which may have occurred during shipping. Carefully unpack equipment
and inspect thoroughly for damage or shortage. Report any damage to carrier and/or shortages to
supplier. All major components and connections should be examined for damage and tightness, with
special attention given to PC boards, plugs, knobs and switches.

1.5 CUSTOMER MODIFICA TION

AC Technology Corporation, its sales representatives and distributors, welcome the opportunity to
assist our customers in applying our products. Many customizing options are available to aid in this
function. AC Technology Corporation cannot assume responsibility for any modifications not authorized
by its engineering department.

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2.0 SCN DIMENSIONS

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0.38"

H

W

D

R

0.38"

0.18"

0.69"

P

0.19"
Dia. Slot

Mounting Tab Detail

INPUT

HP VOLTAGE MODEL H W D P R

0.25 120 / 208 / 240 SN 103S 5.75 2. 88 3. 76 0. 80 4.37
208 / 240 SN203S 5.75 2.88 3.76 0.80 4.37

0.5 120 / 208 / 240 SN 105S 5.75 2.88 3.76 0.80 4.37
208 / 240 SN205S 5.75 2.88 3.76 0.80 4.37
208 / 240 SN205 5.75 2.88 3.76 0.80 4.37

1 120 / 208 / 240 SN 110S 5.75 3.76 5.24 1.90 4.37

208 / 240 SN210S 5.75 2.88 4.56 1.60 4.37
208 / 240 SN210 5.75 2.88 4.56 1.60 4.37

1.5 120 / 208 / 240 SN 115S 5.75 3.76 5.24 1.90 4.37
208 / 240 SN215S 5.75 3.76 5.24 1.90 4.37
208 / 240 SN215 5.75 2.88 5.56 2.60 4.37

2 208 / 240 SN220S 5.75 3.76 5.24 1.90 4.37

208 / 240 SN220 5.75 2.88 5.56 2.60 4.37

3 208 / 240 SN230S 5.75 3.76 6.74 3.40 4.37

208 / 240 SN230 5.75 3.76 6.74 2.60 4.37

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3.0 SCN MODEL DESIGNATION CODE

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The SCN model number gives a full description of the basic drive unit (see example below).

EXAMPLE: SN210 (SCN Series, 208/240 Vac, 1 HP, 3 phase input)

SN 2 10

Series:

SN = SCN Series Variable Speed AC Motor Drive

Input Voltage:

1 2= 120/208/240 Vac (For 110 to 120 Vac and 208 to 240 Vac; 50 or 60 Hz)

= 208/240 Vac (For 208, 220, 230, and 240 Vac; 50 or 60 Hz)

Horsepower:

03

= ¼ Hp

05

= ½ Hp

10

= 1 Hp

15
20
30

= 1½ Hp
= 2 Hp
= 3 Hp

Input: Phase

S = Single phase input only.

No character indicates three phase input only.

4.0 SCN SPECIFICA TIONS

Storage Tem perat ure -20 to 70 C
Ambient Operat ing Tem perat ure 0 to 50 C (up t o 6 k H z c arrier, derate abov e 6 k H z )
Ambient H um idit y < 95% (non-condensing)
Altitude 3300 ft (1000 m ) abov e s ea level (w it hout derating)
Input Line Voltages 120/208/240 Vac s ingle phase, 208/ 240 Vac t hree phase
Input Volt age Tolerance +10%, -15%
Input F requency Toleranc e 48 to 62 Hz
Output W ave F orm Sine Coded PWM
Output F requency 0 - 99 Hz
Carrier Frequency 4 kH z t o 10 k H z
Service F act or 1.00 (up to 6 kH z c arrier, derate abov e 6 kH z)
Effic ienc y Up to 98%
Power Fac t or (dis placem ent ) 0.96 or bett er
Overload Current C apac it y 150% for 60 sec onds, 180% f or 30 s ec onds
Speed Reference F ollower Speed Potentiom eter, 0-10 VDC (m ust be isolat ed)
Power Su pply f or Aux i liary R elay 50 mA a t 12 VD C
Digital Out put Circuit rat ed 50 m A and 30 VD C m ax (t o drive aux iliary r elay)

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WARNING: Control terminals are not isolated from line voltage! Do not touch!

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5.0 SCN RATINGS

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MODEL OUTPUT HEAT LOSS
NUMBER INPUT CURRENT POWER CURRENT (WATTS)
(NOT E 1) HP kW PHASE (AMPS) (kVA) (AMPS) (NOT E 4)

SN100 SERI ES (NOT E 2) 120 / 208 / 240 Vac

SN103S 0.25 0.2 1 6.0 / 3. 5 / 3. 0 0.72 1. 4 / 1. 6 / 1.4 21
SN105S 0.5 0.37 1 9.2 / 5. 3 / 4. 6 1.1 2.2 / 2. 5 / 2. 2 28
SN110S 1 0.75 1 16.6 / 9. 6 / 8.3 2.0 4.2 / 4. 8 / 4. 2 48
SN115S 1.5 1.1 1 24 / 13. 9 / 12. 0 2.9 6.0 / 6.9 / 6.0 73

SN200S SERIES (N OTE 3) 208 / 240 Vac

SN203S 0.25 0.20 1 3.6 / 3.2 0.76 1.6 / 1.4 19
SN205S 0.5 0.37 1 5.4 / 4. 7 1.2 2.5 / 2. 2 26
SN210S 1 0.75 1 10.6 / 9.2 2.2 4.8 / 4.2 49
SN215S 1.5 1.1 1 13.9 / 12.0 2.9 6.9 / 6.0 82
SN220S 2 1.5 1 14.8 / 12. 9 3.2 7.8 / 6.8 86
SN230S 3 2.2 1 19.7 / 17. 1 4.1 11.0 / 9.6 130

SN205 0.5 0.37 3 3.1 / 2.7 1.1 2.5 / 2. 2 24
SN210 1 0.75 3 5.8 / 5.1 2.1 4.8 / 4. 2 41
SN215 1.5 1.1 3 8.0 / 6.9 2.9 6.9 / 6.0 69
SN220 2 1.5 3 9.1 / 7. 9 3.3 7.8 / 6. 8 78

SN230 3 2.2 3 12.4 / 10.8 4.5 11.0 / 9. 6 117
NOTE 1: See Section 3. 0 for m odel number breakdown.
NOT E 2: T he f irs t c urrent rat ings lis t ed are f or 120 Vac input, t he s ec ond c urrent rati ngs are for 208 Vac input,
and the t hird current rat ings are f or 240 Vac input . 120 Vac input y ields t hree phas e 230 Vac out put .
NOT E 3: T he higher c urrent rat ings are f or 208 Vac input and t he low er c urrent rat ings are f or 240 Vac input .
NOTE 4: Values are wors t-c as e (not t ypic al) for 6k Hz c arrier frequency at f ull speed and full load.

FOR MOTORS INPUT (50-60 Hz)

RATED

208 / 240 VacSN200 SE RIES (NOT E 3)

0 - 230 / 200 / 230 Vac

0 - 200 / 230 Vac

0 - 200 / 230 Vac

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6.0 INST ALLATION

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SCN drives are intended for inclusion within other equipment, by professional electrical installers.
They are not intended for stand-alone operation.

DRIVES MUST NOT BE INSTALLED WHERE SUBJECTED T O ADVERSE ENVIRONMENT AL
CONDITIONS SUCH AS: COMBUSTIBLE, OILY, OR HAZARDOUS VAPORS OR DUST;
EXCESSIVE MOISTURE OR DIRT; VIBRATION; EXCESSIVE AMBIENT TEMPERATURES.
CONSULT AC TECHNOLOGY FOR MORE INFORMATION ON THE SUITABILITY OF A DRIVE
TO A P AR TICULAR ENVIRONMENT .

Hazard of electrical shock! The SCN control terminals are not isolated from line voltage! Line voltage
is present between the control terminals and ground. Do not touch!

Disconnect input power and wait three minutes before making connections to the control terminals.
Devices (such as switches, pushbuttons, potentiometers, relays, etc) and wiring connected to the control

terminals are hot to ground and must have an insulation rating of at least 240 Vac or a dielectric rating
of at least 1500 volts to prevent damage to equipment and/or injury to personnel.

SCN models are suitable for UL pollution degree 2 environment only, and MUST be installed in an
electrical enclosure which will provide complete mechanical protection and will maintain the internal
temperature within the drive’s ambient operating temperature rating. All drive models MUST be
mounted in a vertical position for proper heatsink cooling.

Maintain a minimum spacing around the drive of at least one inch on each side and two inches on the
top and bottom. Allow more spacing if the drive is mounted next to other heat-producing equipment.
Do not mount drives above other drives or heat producing equipment. Fans or blowers should be used
to insure proper cooling in tight quarters.

NOTE!

WARNING!

WARNING!

In order to properly size an enclosure, the heat generated by the drive(s) must be known. Refer to the
HEA T LOSS column in Section 5.0 - SCN RATINGS. An enclosure manufacturer can then determine
the required enclosure size based on the total heat generated inside the enclosure (from the drive(s)
and other heat sources), the maximum allowable temperature inside the enclosure, the maximum
ambient temperature outside the enclosure, and the enclosure properties.

The SCN Series is UL approved for solid state motor overload protection. Therefore, a separate
thermal overload relay is not required for single motor applications.

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6.1 INSTALLATION AFTER A LONG PERIOD OF STORAGE

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Severe damage to the drive can result if it is operated after a long period of storage or inactivity
without reforming the DC bus capacitors!

If input power has not been applied to the drive for a period of time exceeding three years (due to
storage, etc), the electrolytic DC bus capacitors within the drive can change internally, resulting in
excessive leakage current. This can result in premature failure of the capacitors if the drive is operated
after such a long period of inactivity or storage.

In order to reform the capacitors and prepare the drive for operation after a long period of inactivity,
apply input power to the drive for 8 hours prior to actually operating the motor.

6.2 EXPLOSION PROOF APPLICA TIONS

Explosion proof motors that are not rated for inverter use lose their certification when used for variable
speed. Due to the many areas of liability that may be encountered when dealing with these applications,
the following statement of policy applies:

“AC Technology Corporation inverter products are sold with no warranty of fitness for a
particular purpose or warranty of suitability for use with explosion proof motors. AC T echnology
Corporation accepts no responsibility for any direct, incidental or consequential loss, cost, or
damage that may arise through the use of its AC inverter products in these applications. The
purchaser expressly agrees to assume all risk of any loss, cost, or damage that may arise from
such application. AC Technology Corporation or AC Technology Corporation’s engineering
department will not knowingly approve applications involving explosion proof motors.”

WARNING!

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7.0 INPUT AC POWER REQUIREMENTS

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Hazard of electrical shock! Capacitors retain charge after power is removed. Disconnect incoming
power and wait until the voltage between terminals B+ and B- is 0 VDC before servicing the drive.

The input voltage must match the nameplate voltage rating of the drive. Voltage fluctuation must not
vary by greater than 10% overvoltage or 15% undervoltage.

NOTE: Drives with dual input voltage ratings must be programmed for the proper supply voltage
(refer to Parameter 01 - LINE VOLTAGE SELECTION in Section 15.0 - DESCRIPTION OF
PARAMETERS).

The drive is suitable for use on a circuit capable of delivering not more than 5,000 RMS symmetrical
amperes at the drive’s rated voltage.

Three phase voltage imbalance must be less than 2.0% phase to phase. Excessive phase to phase
imbalance can cause severe damage to the drive.

Motor voltage should match line voltage in normal applications. The drive’s maximum output voltage
will equal the input voltage. Use extreme caution when using a motor with a voltage rating which is
different from the input line voltage.

7.1 INPUT VOLTAGE RA TINGS

SN100 Series drives are rated for 120/208/240 Vac, single phase, 50-60 Hz input. The drive will
function with input voltage of 120 Vac (+10%, -15%), at 48 to 60 Hz, or with input voltage of 208 to
240 Vac (+ 10%, - 15%), at 48 to 62 Hz.

SN200S Series drives are rated for 208/240 V ac, single phase, 50-60 Hz input. The drive will function
with input voltages of 208 to 240 Vac (+10%, -15%), at 48 to 62 Hz.

WARNING!

SN200 Series drives are rated for 208/240 Vac, three phase, 50-60 Hz input. The drive will function

with input voltages of 208 to 240 Vac (+ 10%, - 15%), at 48 to 62 Hz.

NOTE: Parameter 01 - LINE VOLT AGE SELECTION must be programmed according to the applied
input voltage. See Section 15.0 - DESCRIPTION OF PARAMETERS.

7.2 INPUT FUSING AND DISCONNECT REQUIREMENTS

A circuit breaker or a disconnect switch with fuses must be provided in accordance with the National
Electric Code (NEC) and all local codes.

The SCN drive is capable of withstanding up to 150% current overload for 60 seconds. Select a fuse
or magnetic trip circuit breaker rated at 1.5 times the input current rating of the drive (the minimum
fuse size should be 10 amps, regardless of input current rating). Refer to Section 5.0 - SCN RA TINGS.

Minimum voltage rating of the protection device should be 250 Vac for 120/208/240 V ac and 208/240

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Vac rated drives.

UL Class CC fast-acting, current limiting type fuses should be used when input fusing is required.
Select fuses with low I

2

T values, rated at 200,000 AIC. Recommended fuses are Bussman KTK-R.

Similar fuses with equivalent ratings by other manufacturers may also be acceptable.

8.0 POWER WIRING

Hazard of electrical shock! Capacitors retain charge after power is removed. Disconnect incoming
power and wait until the voltage between terminals B+ and B- is 0 VDC before servicing the drive.

Note drive input and output current ratings and check applicable electrical codes for required wire
type and size, grounding requirements, over-current protection, and incoming power disconnect, before
wiring the drive. Size conservatively to minimize voltage drop.

Strip off 0.20 to 0.25 inches of insulation for input power, output power, and DC Bus wiring. The
input power, output power, and DC Bus terminals must be tightened to a torque of 4.0 to 4.5 lb-in.

Input fusing and a power disconnect switch or contactor MUST be wired in series with terminals L1,
L2, and L3 for three phase input models. For 208/240 V ac single phase input models, use terminals L1
and L2. For 120 Vac single phase input models, use terminals L1 and N. This disconnect must be
used to power down the drive when servicing, or when the drive is not to be operated for a long period
of time, but should not be used to start and stop the motor. Repetitive cycling of a disconnect or input
contactor (more than once every two minutes) may cause damage to the drive.

8.1 WIRING FOR SINGLE PHASE OR THREE PHASE INPUT

If the drive is rated for 120/208/240 Vac single phase input (SN100S models), wire the input to
terminals L1 and N for 120 V ac voltage, or wire to terminals L1 and L2 (do not wire to N) for 208/240
Vac input voltage. Refer to Section 9.0 - SCN POWER WIRING DIAGRAM.

WARNING!

If the drive is rated for 208/240 Vac single phase input (SN200S models), wire the input to terminals
L1 and L2.

If the drive is rated for three phase input (SN200 models), wire the input to terminals L1, L2, and L3.

All three power output wires, from terminals T1, T2, and T3 to the motor, must be kept tightly bundled
and run in a separate conduit away from all other power and control wiring.

Do not install contactors between the drive and motor without consulting AC Technology Corporation
for more information. Operating such devices while the drive is running can potentially cause damage
to the drive's power components. If such a device is required, it should only be operated when the
drive is in a STOP state.

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9.0 SCN POWER WIRING DIAGRAM

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THREE PHASE INPUT

(SN200 SERIES)

L1 L2 L3

208/240 Vac SINGLE PHASE INPUT

(SN100 AND SN200S SERIES)

L1 L2 L3*

*On SN100 models, this terminal

is labeled N.

WARNING!

Do not connect incoming AC power to output terminals T1, T2, or T3. Severe damage to the drive will
result.

120 Vac SINGLE PHASE INPUT

(SN100 SERIES)

L1 L2 N

OUTPUT (ALL SERIES)

T1 T2 T3 B- B+

+

3 PHASE

AC MOTOR

DC BUS

VOLTAGE

NOTES:

1. WIRE AND GROUND IN ACCORDANCE WITH NEC OR CEC, AND ALL APPLICABLE
LOCAL CODES.

2. Motor wires MUST be run in a separate steel conduit away from control wiring and incoming AC
power wiring.

3. Do not install contactors between the drive and the motor without consulting AC Technology for
more information. Failure to do so may result in drive damage.

4. Use only UL and CSA listed and approved wire.

5. Minimum wire voltage ratings: 300 V for 120, 208 and 240 Vac systems.

6. Wire gauge must be based on a minimum of 125% of the rated input/output current of the drive,
and a minimum 75°C insulation rating. Use copper wire only.

7. Strip off 0.20 to 0.25 inches of insulation for input power, output power, and DC Bus wiring.

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10.0 CONTROL WIRING

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Hazard of electrical shock! The SCN control terminals are not isolated from line voltage! Line voltage
is present between the control terminals and ground. Do not touch!

Disconnect input power and wait three minutes before making connections to the control terminals.
Devices (such as switches, pushbuttons, potentiometers, relays, etc) and wiring connected to the control

terminals are hot to ground and must have an insulation rating of at least 240 Vac or a dielectric rating
of at least 1500 volts to prevent damage to equipment and/or injury to personnel.

10.1 CONTROL WIRING VS. POWER WIRING

External control wiring MUST be run in a separate conduit away from all other input and output
power wiring. If control wiring is not kept separate from power wiring, electrical noise may be generated
on the control wiring that will cause erratic drive behavior. Use twisted wires or shielded cable rated
for 300 VDC minimum (do not ground the shield).

10.2 SURGE SUPPRESION ON RELA YS

Current and voltage surges and spikes in the coils of contactors, relays, and solenoids, near or connected
to the drive, can cause erratic drive operation. Snubbers should be used on any coils associated with
the drive. For AC loads, snubbers should consist of a resistor and a capacitor in series across the coil.
For DC loads, a free-wheeling or flyback diode should be placed across the coil.

10.3 START/STOP CONTROL

There are various control schemes that allow for 2-wire and 3-wire Start/Stop circuits. Refer to the
wiring diagrams in Section 11.0 - SCN CONTROL WIRING DIAGRAMS.

10.4 SPEED REFERENCE SIGNALS

WARNING!

SPEED POT Connect the wiper to terminal TB-5, and connect the high and low end leads to

0-10 VDC Wire the positive to terminal TB-5 and the negative to terminal TB-3. The 0-10

DO NOT connect the low side of the speed pot or 0-10 VDC signal to ground.

terminals TB-6 and TB-3, respectively. The speed pot can be 5kΩ up to 10kΩ.

VDC signal must be isolated, as the control terminals are at line voltage potential.

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10.5 SPEED REFERENCE SELECTION

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If a speed pot is to be used to control the drive speed, terminal TB-13A, 13B, or 13C (Parameter 10,
11, or 12) may be programmed as the input select for the speed pot. When that TB-13 terminal is then
closed to TB-11, the drive will follow the speed pot input.

If the speed pot is not selected on the terminal strip using TB-13A, 13B, or 13C, speed control will
default to ST ANDARD mode, which is governed by the setting of Parameter 05 - ST ANDARD SPEED
SOURCE. The ST ANDARD SPEED SOURCE can be the ! and " buttons on the front of the drive,
PRESET SPEED #1 (Parameter 31), or a speed pot.

PRESET SPEEDS

TB-13A can be programmed to select PRESET SPEED #1, TB-13B to select PRESET SPEED #2,
and TB-13C to select PRESET SPEED #3. There are a total of seven preset speeds, which are activated
by different combinations of contact closures between TB-13A, 13B, 13C and TB-11. Refer to
Parameters 31-37 in Section 15.0 - DESCRIPTION OF PARAMETERS.

JOG

TB-13B can be programmed to select either JOG FORWARD or JOG REVERSE. The Jog speed is set
by PRESET SPEED #2. Close TB-13B to TB-11 to JOG, and open the contact to STOP.

When operating in JOG mode, the STOP signal and the AUXILIARY ST OP function (see Parameters
10-12) WILL NOT stop the drive. To stop the drive, remove the JOG command.

JOG REVERSE will operate the drive in reverse rotation even if ROTATION DIRECTION (Parameter

17) is set to FORWARD ONLY.

NOTE: If the drive is commanded to JOG while running, the drive will enter JOG mode and run at
PRESET SPEED #2. When the JOG command is removed, the drive will STOP.

MOTOR OPERATED POT (MOP) / FLOA TING POINT CONTROL

TB-13B and TB-13C are required for this function, which controls the drive speed using normally
open contacts wired to the terminal strip. Program TB-13B for DECREASE FREQ, and program TB­13C for INCREASE FREQ. Closing the contacts between the TB-13 terminals and TB-11 will cause
the speed setpoint to increase or decrease until the contact is opened. The INCREASE FREQ function
will only operate while the drive is running.

NOTE: If TB-13A, TB-13B, and TB-13C are all programmed to select speed references, and two or
three of the terminals are closed to TB-11, the higher terminal has priority and will override the others.
For example, if TB-13A is programmed to select a speed pot, and TB-13C is programmed to select
PRESET SPEED #3, closing both terminals to TB-11 will cause the drive to respond to PRESET
SPEED #3, because TB-13C overrides TB-13A.

WARNING!

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10.7 DRIVE STATUS DIGITAL OUTPUTS

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There is one open-collector output at terminal TB-14. The open-collector circuit is a current-sinking
type rated at 30 VDC and 50 mA maximum.

The open-collector output can be programmed to indicate any one of the following: RUN, FAULT,
INVERSE FAULT , F AUL T LOCKOUT , AT SPEED, ABOVE PRESET SPEED #3, CURRENT LIMIT ,
AUTO SPEED MODE, and REVERSE. Refer to Parameter 06 in Section 15.0 - DESCRIPTION OF
PARAMETERS.

DIODE SNUBBER

(RECOMMENDED)

TB-11

RELA Y COIL

TB-14

SCN TERMINAL STRIP

Hazard of electrical shock! The SCN control terminals are not isolated from line voltage! Line voltage

WARNING!

is present between the control terminals and ground. Do not touch!
Only use relays with an insulation rating of at least 240 Vac or a dielectric rating of at least 1500 volts

to prevent damage to equipment and/or injury to personnel.

NOTE: When the optional remote keypad is used, TB-14 is wired to the remote keypad and cannot be
used for status indication.

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