AC Tech MC3000 Operation Manual

MCH Series

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

Installation and Operation Manual

1.0 GENERAL

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

1.1 PRODUCTS COVERED IN THIS MANUAL

This manual covers the AC Tech MCH Variable Frequency Drive and optional
configurations. The main focus of this manual is the standard drive. Refer to Appendix
A for the Bypass option, or Appendix B for the Option Box.

1.2 PRODUCT CHANGES

AC Technology Corporation reserves the right to discontinue or make modifications to
the design of its products and manuals 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. Instruction manuals
with the most up-to-date information are available for download from the AC Tech website
(www.actechdrives.com).

1.3 WARRANTY

AC Technology Corporation warrants the MCH Series AC motor control to be free of defects
in material and workmanship for a period of eighteen months from the date of sale to the user,
or two years from the date of shipment, which ever occurs first. An MCH Series control, or
any component contained therein, which under normal use, becomes defective within the
stated warranty time period, shall be returned to AC Technology Corporation, freight prepaid,
for examination (contact AC Technology Corporation for authorization prior to returning any
product). 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, switches, etc.

1.5 CUSTOMER MODIFICATION

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.

1

2.0 MCH SPECIFICATIONS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

Storage Temperature -20° to 70° C

Ambient Operating Temperature Type 1 (IP 31) -10
(With 2.5, 6, and 8 kHz carrier,
derate for higher carriers)

Ambient Humidity Less than 95% (non-condensing)

Altitude 3300 feet (1000 m) above sea level
without derating

Input Line Voltages 240/200 Vac, 480/400 Vac, & 590/480 Vac

Input Voltage Tolerance +10%, -15%

Input Frequency Tolerance 48 to 62 Hz

Output Wave Form Sine Coded PWM

Output Frequency 0-120 Hz

Carrier Frequency 2.5 kHz to 14 kHz

Frequency Stability + 0.00006% / °C

Efficiency > 97% throughout speed range

Power Factor (displacement) > 0.96

° to 40° C

Service Factor 1.00

Overload Current Capacity 120% of output rating for 60 seconds

Speed Reference Follower 0-10 VDC, 4-20 mA

Control Voltage 15 VDC

Analog Outputs 0 - 10 VDC, or 2 - 10 VDC
Proportional to speed or load

Digital Outputs Form C relay: 2 A at 28 VDC or 120 Vac
Open-collector outputs: 40 mA at 30 VDC

2

3.0 MCH MODEL DESIGNATION CODE

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

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

EXAMPLE: MH450BH

(MCH, 480 Vac, 5 HP, Type 1 Enclosure, with Additional Form C Relay)

MH 4 50 B H

Series:

MH = MCH Series Variable Speed AC Motor Drive

Input Voltage:

2 = 240/200 Vac (For 208, 230, and 240 Vac; 50 or 60 Hz)

4 = 480/400 Vac (For 380, 415, 440, 460 and 480 Vac; 50 or 60 Hz)

5 = 590/480 Vac (For 440, 460, 480, 575 and 600 Vac; 50 or 60 Hz)

Rating:

10 = 1 HP (0.75 kW) 200 = 20 HP (15 kW) 1000 = 100 HP (75 kW)

20 = 2 HP (1.5 kW) 250 = 25 HP (18.5 kW) 1250 = 125 HP (90 kW)

30 = 3 HP (2.2 kW) 300 = 30 HP (22 kW) 1500 = 150 HP (110 kW)

50/51 = 5 HP (3.7 kW) 400 = 40 HP (30 kW) 2000 = 200 HP (150 kW)

75 = 7½ HP (5.5 kW) 500 = 50 HP (37.5 kW) 2500 = 250 HP (185 kW)

100 = 10 HP (7.5 kW) 600 = 60 HP (45 kW)

150 = 15 HP (11 kW) 750 = 75 HP (55 kW)

Enclosure Type:

B = NEMA 1: General Purpose, vented

C = NEMA 4: Water-tight and Dust-tight

D = NEMA 12: Oil-tight and Dust-tight

E = NEMA 4X: Water-tight, Dust-tight, and Corrosion Resistant (Stainless Steel)

Standard Options:

H = Additional Form C relay circuit board

No character when this type of option is not specified.

NOTE: Drives equipped with Bypass or the Option Box will have a modified
version of this model number format. Not all enclosure types are available when
drives are equipped with Bypass or the Option Box.

3

4.0 MCH DIMENSIONS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

NOTE: These dimensions apply to standard MCH drives. Consult the factory
for dimensions of drives equipped with Bypass or the Option Box.

4.1 TYPE 1 DIMENSIONS FOR MODELS RATED UP TO 30 HP AT
240/200 Vac AND 60 HP AT 480/400 Vac AND 590 Vac

W

R

Q Q

P

N

HP

(kW)

(0.75)

(1.5)

(2.2)

(3.7)

(5.5)

INPUT

VOLTAGE MODEL H W D N P Q R S

240 / 200 MH210B 7.50 4.70 4.33 2.35 2.60 1.37 5.50 0.88

1

480 / 400 MH410B 7.50 4.70 3.63 2.35 1.90 1.37 5.50 0.88

590 MH510B 7.50 4.70 3.63 2.35 1.90 1.37 5.50 0.88

240 / 200 MH220B 7.50 6.12 5.12 3.77 3.30 1.37 5.50 0.88

2

480 / 400 MH420B 7.50 6.12 4.22 3.77 2.40 1.37 5.50 0.88

590 MH520B 7.50 6.12 4.22 3.77 2.40 1.37 5.50 0.88

240 / 200 MH230B 7.50 6.12 5.12 3.77 3.30 1.37 5.50 0.88

3

480 / 400 MH430B 7.50 6.12 5.12 3.77 3.30 1.37 5.50 0.88

590 MH530B 7.50 6.12 5.12 3.77 3.30 1.37 5.50 0.88

240 / 200 MH250B 7.88 7.86 5.94 5.13 3.95 1.50 5.88 1.13

5

480 / 400 MH450B 7.50 6.12 5.12 3.77 3.30 1.37 5.50 0.88

590 MH551B 7.88 7.86 5.94 5.13 3.95 1.50 5.88 1.13

240 / 200 MH275B 9.38 7.86 6.84 3.93 4.19 2.00 5.88 1.13

7.5
480 / 400 MH475B 9.38 7.86 6.25 5.13 3.95 1.50 7.38 1.13

590 MH575B 9.38 7.86 6.25 5.13 3.95 1.50 7.38 1.13

Conduit Holes:

S Dia.

0.88" Dia.

S Dia.

Dia. Slot

D

W

U

V

T

Mounting Tab Detail

H

1.00"

R

IF W < 7.86"
T = 0.20"
U = 0.34"
V = 0.19"

IF W = 10.26"
T = 0.28"
U = 0.44"
V = 0.24"

4

TYPE 1 DIMENSIONS (continued)

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

HP

(kW)

(7.5)

(11)

(15)

(18.5)

(22)

(30)

(37.5)

(45)

INPUT

VOLTAGE MODEL H W D N P Q R S

240 / 200 MH2100B 11.25 7.86 6.84 3.93 4.19 2.00 7.75 1.38

10

480 / 400 MH4100B 9.38 7.86 6.84 3.93 4.19 2.00 5.88 1.13

590 MH5100B 9.38 7.86 7.40 3.93 4.19 2.00 5.88 1.13

240 / 200 MH2150B 12.75 7.86 6.84 3.93 4.19 2.00 9.25 1.38

15

480 / 400 MH4150B 11.25 7.86 6.84 3.93 4.19 2.00 7.75 1.38

590 MH5150B 12.75 7.86 6.84 3.93 4.19 2.00 9.25 1.38

240 / 200 MH2200B 12.75 10.26 7.74 5.13 5.00 2.50 9.25 1.38

20

480 / 400 MH4200B 12.75 7.86 6.84 3.93 4.19 2.00 9.25 1.38

590 MH5200B 12.75 7.86 7.40 3.93 4.19 2.00 9.25 1.38

240 / 200 MH2250B 15.75 10.26 8.35 5.13 5.00 2.50 12.25 1.38

25

480 / 400 MH4250B 12.75 10.26 7.74 5.13 5.00 2.50 9.25 1.38

590 MH5250B 12.75 10.26 7.74 5.13 5.00 2.50 9.25 1.38

240 / 200 MH2300B 15.75 10.26 8.35 5.13 5.00 2.50 12.25 1.38

30

480 / 400 MH4300B 12.75 10.26 7.74 5.13 5.00 2.50 9.25 1.38

590 MH5300B 12.75 10.26 8.25 5.13 5.00 2.50 9.25 1.38

480/400 MH4400B 15.75 10.26 8.35 5.13 5.75 2.50 12.25 1.38

40

590 MH5400B 15.75 10.26 8.35 5.13 5.75 2.50 12.25 1.38

480 / 400 MH4500B 19.75 10.26 8.55 5.13 5.75 2.50 16.25 1.75

50

590 MH5500B 19.75 10.26 8.55 5.13 5.75 2.50 16.25 1.75

480 / 400 MH4600B 19.75 10.26 8.55 5.13 5.75 2.50 16.25 1.75

60

590 MH5600B 19.75 10.26 8.55 5.13 5.75 2.50 16.25 1.75

5

4.2 TYPE 1 DIMENSIONS FOR MODELS RATED ABOVE 30 HP AT

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

240/200 Vac AND 60 HP AT 480/400 Vac AND 590 Vac

W

R

Q

Q

P

N

HP

INPUT

(kW)

VOLTAGE MODEL H W D N P Q R S

40

240 / 200 MH2400B 25.00 13.00 10.50 5.56 6.50 2.62 22.00 1.38

(30)

50

240 / 200 MH2500B 25.00 13.00 10.50 5.56 6.50 2.62 22.00 1.38

(37.5)

60

240 / 200 MH2600B 47.00 16.64 11.85 7.14 6.88 3.12 N/A 1.75

(45)

75

480 / 400 MH4750B 29.00 16.64 11.85 7.14 6.88 3.12 N/A 1.75

(55)

100
(75)

125
(90)

150

(110)

200

(150)

250

(185)

590 MH5750B 29.00 16.64 11.85 7.14 6.88 3.12 N/A 1.75

480/400 MH41000B 29.00 16.64 11.85 7.14 6.88 3.12 N/A 1.75

590 MH51000B 29.00 16.64 11.85 7.14 6.88 3.12 N/A 1.75

480 / 400 MH41250B 29.00 24.42 11.85 11.12 6.50 4.50 N/A 2.50

590 MH51250B 29.00 24.42 11.85 11.12 6.50 4.50 N/A 2.50

480 / 400 MH41500B 29.00 24.42 11.85 11.12 6.50 4.50 N/A 2.50

590 MH51500B 29.00 24.42 11.85 11.12 6.50 4.50 N/A 2.50

480 / 400 MH42000B 29.00 36.66 11.85

590 MH52000B 29.00 36.66 11.85

480 / 400 MH42500B 29.00 36.66 11.85

Conduit Holes:

1.13" Dia.

S Dia.

S Dia.

IF W = 13.00"
T = 0.36"
U = 0.68"
V = 0.31"

IF W > 16.64"
See Mounting
Tab Detail in
Section 4.3

T

Dia.

Mounting Tab Detail

See Section 4.3

D

H

U

V

1.50"

3.00"

6

4.3 CONDUIT HOLES AND MOUNTING TAB DETAIL FOR MODELS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

MH42000B, MH52000B, AND MH42500B

P

N

7.25"

Conduit Holes: Large holes = 3.00"
Small holes = 1.13"

N = 7.45"
P = 9.00"

6.50"

Q = 7.00"

0.44"
Dia.

Mounting Tab Detail

Q

P

0.92"

0.43"

1.36"

3.00"

1.36"

7

4.4 TYPE 4, 4X, AND 12 DIMENSIONS FOR MODELS RATED UP TO

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

30 HP AT 240/200 Vac AND 60 HP AT 480/400 Vac AND 590 Vac

W

R

Q Q

P

N

HP

INPUT

(kW)

VOLTAGE MODEL* H W D N P Q R S

1 240 / 200 MH210 7.88 6.12 4.35 3.06 2.70 1.37 5.88 0.88

(0.75) 480 / 400 MH410 7.88 6.12 4.35 3.06 2.70 1.37 5.88 0.88

590 MH510 7.88 6.12 4.35 3.06 2.70 1.37 5.88 0.88

2 240 / 200 MH220 7.88 7.86 4.90 4.80 3.25 1.37 5.88 0.88

(1.5) 480 / 400 MH420 7.88 7.86 4.90 4.80 3.25 1.37 5.88 0.88

590 MH520 7.88 7.86 4.90 4.80 3.25 1.37 5.88 0.88

3 240 / 200 MH230 7.88 7.86 5.90 4.80 4.25 1.37 5.88 0.88

(2.2) 480 / 400 MH430 7.88 7.86 4.90 4.80 3.25 1.37 5.88 0.88

590 MH530 7.88 7.86 4.90 4.80 3.25 1.37 5.88 0.88

5 240 / 200 MH250 9.75 10.26 7.20 5.13 5.25 2.00 7.75 1.13

(3.7) 480 / 400 MH450 7.88 7.86 5.90 4.80 4.25 1.37 5.88 0.88

590 MH550 7.88 7.86 5.90 4.80 4.25 1.37 5.88 0.88

7.5 240 / 200 MH275 11.75 10.26 8.35 5.13 5.75 2.00 9.75 1.13

(5.5) 480 / 400 MH475 9.75 10.26 7.20 5.13 5.25 2.00 7.75 1.13

590 MH575 9.75 10.26 7.20 5.13 5.25 2.00 7.75 1.13

10 240 / 200 MH2100 13.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

(7.5) 480 / 400 MH4100 11.75 10.26 8.35 5.13 5.75 2.00 9.75 1.13

590 MH5100 11.75 10.26 8.35 5.13 5.75 2.00 9.75 1.13

Conduit Holes:

S Dia.

0.88" Dia.

S Dia.

Dia. Slot

D

W

U

V

T

Mounting Tab Detail

1.00"

R

H

IF W = 7.86"
T = 0.20"
U = 0.34"
V = 0.19"

IF W = 10.26"
IF W = 13.72"
T = 0.28"
U = 0.44"
V = 0.24"

8

TYPE 4, 4X, AND 12 DIMENSIONS (continued)

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

HP

INPUT

(kW)

VOLTAGE MODEL* H W D N P Q R S

15 240 / 200 MH2150 15.75 10.26 8.35 5.13 5.75 2.00 13.75 1.38

(11) 480 / 400 MH4150 13.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

590 MH5150 13.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

20 240 / 200 MH2200D 15.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

(15) 480 / 400 MH4200 15.75 10.26 8.35 5.13 5.75 2.00 13.75 1.38

590 MH5200 15.75 10.26 8.35 5.13 5.75 2.00 13.75 1.38

25 240 / 200 MH2250D 20.25 10.26 8.35 5.13 5.75 2.00 16.25 1.38

(18.5) 480 / 400 MH4250D 15.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

590 MH5250D 15.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

30 240 / 200 MH2300D 20.25 10.26 8.35 5.13 5.75 2.00 16.25 1.38

(22) 480 / 400 MH4300D 15.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

590 MH5300D 15.75 10.26 8.35 5.13 5.75 2.00 11.75 1.38

40 480 / 400 MH4400D 20.25 10.26 8.35 5.13 5.75 2.00 16.25 1.38

(30) 590 MH5400D 20.25 10.26 8.35 5.13 5.75 2.00 16.25 1.38

50 480 / 400 MH4500D 21.00 13.72 8.35 5.13 6.10 2.00 16.25 1.38

(37.5) 590 MH5500D 21.00 13.72 8.35 5.13 6.10 2.00 16.25 1.38

60 480 / 400 MH4600D 21.00 13.72 8.35 5.13 6.10 2.00 16.25 1.38

(45) 590 MH5600D 21.00 13.72 8.35 5.13 6.10 2.00 16.25 1.38

* MODELS WITH BLANK ENCLOSURE DESIGNATION ARE AVAILABLE IN NEMA 4

(INDICATED BY “C”) OR 4X STAINLESS STEEL (INDICATED BY “E”).

9

4.5 TYPE 12 DIMENSIONS FOR MODELS RATED ABOVE 30 HP AT

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

240/200 Vac AND 60 HP AT 480/400 Vac AND 590 Vac

P

(37.5)

W

R

QQ

N

HP

(kW)

(30)

(45)

(55)

100
(75)

125
(90)

INPUT

VOLTAGE MODEL H W D N P Q R S

40

240 / 200 MH2400D 31.00 14.00 11.86 6.00 7.50 2.62 22.50 1.38

50

240 / 200 MH2500D 31.00 14.00 11.86 6.00 7.50 2.62 22.50 1.38

60

240 / 200 MH2600D 37.00 18.00 13.30 7.50 8.00 3.13 27.00 1.75

480 / 400 MH4750D 37.00 18.00 13.30 7.50 8.00 3.13 27.00 1.75

75

590 MH5750D 37.00 18.00 13.30 7.50 8.00 3.13 27.00 1.75

480 / 400 MH41000D 39.00 26.00 13.30 11.50 8.00 4.50 27.00 2.50

590 MH51000D 39.00 26.00 13.30 11.50 8.00 4.50 27.00 2.50

480 / 400 MH41250D 39.00 26.00 13.30 11.50 8.00 4.50 27.00 2.50

590 MH51250D 39.00 26.00 13.30 11.50 8.00 4.50 27.00 2.50

Conduit Holes:

1.13" Dia.

S Dia.

S Dia.

IF W > 14.00"
T = 0.36"
U = 0.68"
V = 0.31"

T

Dia.

Mounting Tab Detail

D

H

U

V

3.00"

1.50"

10

5.0 MCH RATINGS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The following tables indicate the input and output ratings of the MCH Series
drive.

NOTE: The output current ratings are based on operation at carrier frequencies
of 8 kHz and below. At full ambient temperature, operation at carrier frequencies
above 8 kHz require derating the drive by multiplying the output current rating
by the following factors: 0.94 at 10 kHz, 0.89 at 12 kHz, and 0.83 at 14 kHz.
Refer to Parameter 23 - CARRIER FREQ in Section 18.0 - DESCRIPTION OF
PARAMETERS.

MH200 SERIES RATINGS

MODEL

MODEL FOR MOTORS NOMINAL NOMINAL

NUMBER RATED INPUT CURRENT POWER CURRENT POWER

(NOTE 1) HP kW PHASE (AMPS) (KVA) (AMPS) (KVA)

MH210 1 0.75 3 5.5 / 4.8 2.0 4.6 / 4.0 1.6

MH220 2 1.5 3 9.3 / 8.1 3.4 7.8 / 6.8 2.7

MH230 3 2.2 3 13.0 / 11.3 4.7 11.0 / 9.6 3.8

MH250 5 3.7 3 20 / 17.7 7.4 17.5 / 15.2 6.1

MH275 7.5 5.5 3 30 / 26 10.6 25 / 22 8.8

MH2100 10 7.5 3 37 / 32 13.2 32 / 28 11.2

MH2150 15 11 3 55 / 48 19.8 48 / 42 16.7

MH2200 20 15 3 70 / 61 25.3 62 / 54 21.5

MH2250 25 18.5 3 89 / 77 32.0 78 / 68 27.1

MH2300 30 22 3 104 / 90 37.6 92 / 80 31.9

MH2400 40 30 3 99 / 99 41.0 104 / 104 41.4

MH2500 50 37.5 3 122 / 122 50.7 130 / 130 51.8

MH2600 60 45 3 145 / 145 60.5 154 / 154 61.3

(200/240 Vac, 50 - 60 Hz) (0 - 200/230 Vac)

INPUT OUTPUT

NOTE 1: See Section 3.0 for model number breakdown.

NOTE 2: See Section 8.0 for recommended fuse type.

11

MH400 SERIES RATINGS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

MODEL

MODEL
NUMBER
(NOTE 1)

MH410 1 0.75 3 2.8 / 2.4 2.0 2.3 / 2.0 1.6

MH420 2 1.5 3 4.7 / 4.1 3.4 3.9 / 3.4 2.7

MH430 3 2.2 3 6.6 / 5.7 4.7 5.5 / 4.8 3.8

MH450 5 3.7 3 10.2 / 8.9 7.3 8.7 / 7.6 6.1

MH475 7.5 5.5 3 14.7 / 12.8 10.6 12.6 / 11.0 8.8

MH4100 10 7.5 3 18.3 / 15.9 13.2 16.0 / 14.0 11.2

MH4150 15 11 3 28 / 24 19.8 24 / 21 16.7

MH4200 20 15 3 36 / 31 25.3 31 / 27 21.5

MH4250 25 18.5 3 44 / 38 31.9 39 / 34 27.1

MH4300 30 22 3 52 / 45 37.6 46 / 40 31.9

MH4400 40 30 3 68 / 59 49.0 60 / 52 41.4

MH4500 50 37.5 3 85 / 74 61.5 75 / 65 51.8

MH4600 60 45 3 100 / 87 72.3 88 / 77 61.3

MH4750 75 55 3 91 / 91 75.5 96 / 96 76.5

MH41000 100 75 3 116 / 116 96.4 124 / 124 98.8

MH41250 125 90 3 146 / 146 121.4 156 / 156 124.3

MH41500 150 110 3 168 / 168 139.7 180 / 180 143.4

MH42000 200 150 3 225 / 225 187.1 240 / 240 191.2

MH42500 250 185 3 281 / 281 233.6 300 / 300 240.6

NOTE 1: See Section 3.0 for model number breakdown.

NOTE 2: See Section 8.0 for recommended fuse type.

FOR MOTORS

RATED CURRENT POWER CURRENT POWER

HP kW (AMPS) (KVA) (AMPS) (KVA)

(400/480 Vac, 50 - 60 Hz) (0 - 400/460 Vac)

INPUT
PHASE

INPUT OUTPUT

NOMINAL NOMINAL

12

MH500 SERIES RATINGS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

MODEL

MODEL
NUMBER
(NOTE 1)

MH510 1 0.75 3 1.9 / 1.9 1.9 1.6 / 1.6 1.6

MH520 2 1.5 3 3.3 / 3.3 3.4 2.7 / 2.7 2.7

MH530 3 2.2 3 4.6 / 4.6 4.7 3.9 / 3.9 3.9

MH551 5 3.7 3 7.1 / 7.1 7.3 6.1 / 6.1 6.1

MH575 7.5 5.5 3 10.5 / 10.5 10.7 9.0 / 9.0 8.8

MH5100 10 7.5 3 12.5 / 12.5 12.8 11.0 / 11.0 11.0

MH5150 15 11 3 19.3 / 19.3 19.7 17.0 / 17.0 16.9

MH5200 20 15 3 25 / 25 25.4 22 / 22 21.5

MH5250 25 18.5 3 31 / 31 31.2 27 / 27 26.9

MH5300 30 22 3 36 / 36 37.1 32 / 32 31.9

MH5400 40 30 3 47 / 47 47.5 41 / 41 40.8

MH5500 50 37.5 3 59 / 59 60.3 52 / 52 51.8

MH5600 60 45 3 71 / 71 72.5 62 / 62 61.7

MH5750 75 55 3 74 / 74 75.7 77 / 77 76.7

MH51000 100 75 3 95 / 95 96.6 99 / 99 98.6

MH51250 125 90 3 119 / 119 121.6 125 / 125 124.5

MH51500 150 110 3 137 / 137 140.0 144 / 144 143.4

MH52000 200 150 3 183 / 183 187.0 192 / 192 191.2

NOTE 1: See Section 3.0 for model number breakdown.

NOTE 2: See Section 8.0 for recommended fuse type.

FOR MOTORS

RATED CURRENT POWER CURRENT POWER

HP kW (AMPS) (KVA) (AMPS) (KVA)

(480/590 Vac, 50 - 60 Hz) (0 - 460/575 Vac)

INPUT
PHASE

INPUT OUTPUT

NOMINAL NOMINAL

13

6.0 THEORY

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

6.1 DESCRIPTION OF AC MOTOR OPERATION

Three phase AC motors are comprised of two major components, the stator and
the rotor. The stator is a set of three electrical windings held stationary in the
motor housing. The rotor is a metal cylinder, fixed to the motor drive shaft, which
rotates within the stator. The arrangement of the stator coils and the presence
of three phase AC voltage give rise to a rotating magnetic field which drives the
rotor. The speed at which the magnetic field rotates is known as the synchronous
speed of the motor. Synchronous speed is a function of the frequency at which
the voltage is alternating and the number of poles in the stator windings.

The following equation gives the relation between synchronous speed, frequency,
and the number of poles:

Ss = 120 f/p

Where: Ss = Synchronous speed (rpm ), f = frequency (Hz),
p = number of poles

In three phase induction motors the actual shaft speed differs from the synchronous
speed as load is applied. This difference is known as “slip”. Slip is commonly
expressed as a percentage of synchronous speed. A typical value is three percent
at full load.

The strength of the magnetic field in the gap between the rotor and stator is
proportional to the amplitude of the voltage at a given frequency. The output
torque capability of the motor is, therefore, a function of the applied voltage
amplitude at a given frequency. When operated below base (rated) speed, AC
motors run in the range of “constant torque”. Constant torque output is obtained
by maintaining a constant ratio between voltage amplitude (Volts) and frequency
(Hertz). For 60 Hz motors rated at 230, 460, and 575 Vac, common values for
this V/Hz ratio are 3.83, 7.66, and 9.58 respectively. Operating with these V/Hz
ratios generally yields optimum torque capability. Operating at lower ratio values
results in lower torque and power capability. Operating at higher ratio values will
cause the motor to overheat. Most standard motors are capable of providing full
torque output from 3 to 60 Hz. However, at lower speeds, where motor cooling
fans become less effective, supplemental cooling may be needed to operate at full
torque output continuously.

14

If the frequency applied to the motor is increased while the voltage remains

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

constant, torque capability will decrease as speed increases. This will cause the
horsepower capability of the motor to remain approximately constant. Motors
run in this mode when operated above base speed, where drive output voltage is
limited by the input line voltage. This operating range is known as the “constant
horsepower” range. The typical maximum range for constant horsepower is about

2.3 to 1 (60 to 140 Hz). The diagram below depicts the characteristics of a typical
AC induction motor with a 60 Hz base speed.

WARNING!

Consult motor manufacturer before operating motor and/or driven equipment
above base speed.

150

130

110

90

70

50

TORQUE (%)

30

10

CONSTANT TORQUE

TORQUE HORSEPOWER

HORSEPOWER

20 40

60 80 100 120

CONSTANT HP

TORQUE

FREQUENCY (Hz)

6.1.1 VARIABLE TORQUE VS. CONSTANT TORQUE

Variable frequency drives, and the loads they are applied to, can generally be
divided into two groups: constant torque and variable torque. Constant torque
loads include: vibrating conveyors, punch presses, rock crushers, machine tools,
and just about every other application that is not considered variable torque.
Variable torque loads include centrifugal pumps and fans, which make up the
majority of HVAC applications.

Variable torque loads are governed by the affinity laws, which define the
relationships between speed, flow, torque and horsepower. The diagram below
illustrates these relationships:

15

100%

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

75%

50%

25%

0%

% FLOW

% TORQUE

% HORSEPOWER

100%75%50%25%0%

% SPEED

“Variable torque” refers to the fact that the torque required varies with the square
of the speed. Also, the horsepower required varies with the cube of the speed,
resulting in a large reduction in horsepower for even a small reduction in speed.
It is easily seen that substantial energy savings can be achieved by reducing the
speed of a fan or pump. For example, reducing the speed to 50% results in a
50 HP motor having to produce only 12.5% of rated horsepower, or 6.25 HP.
Variable torque drives usually have a low overload capacity (110% - 120% for
60 seconds), because variable torque applications rarely experience overload
conditions. To optimize efficiency and energy savings, variable torque drives are
usually programmed to follow a variable V/Hz ratio.

The term “constant torque” is not entirely accurate in terms of the actual torque
required for an application. Many constant torque applications have reciprocating
loads, such as vibrating conveyors and punch presses, where the rotational motion
of the motor is being converted to a linear motion. In such cases, the torque required
can vary greatly at different points in the cycle. For constant torque loads, this
fluctuation in torque is not a direct function of speed, as it is with a variable torque
load. As a result, constant torque drives typically have a high overload rating
(150% for 60 seconds) in order to handle the higher peak torque demands. To
achieve maximum torque, constant torque drives follow a constant V/Hz ratio.

The MCH Series has an overload capacity of 120% for one minute, indicating
that it is meant for variable torque loads.

6.2 DRIVE FUNCTION DESCRIPTION

The MC Series is a microprocessor based, keypad programmable, variable speed
AC motor drive. There are four major sections: an input diode bridge and filter,
a power board, a control board, and an output intelligent power module.

16

6.2.1 DRIVE OPERATION

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

Incoming AC line voltage is converted to a pulsating DC voltage by the input
diode bridge. The DC voltage is supplied to the bus filter capacitors through a
charge circuit which limits inrush current to the capacitors during power-up. The
pulsating DC voltage is filtered by the bus capacitors which reduces the ripple
level. The filtered DC voltage enters the inverter section of the drive, composed
of six output intelligent insulated gate bi-polar transistors (IGBTs) which make up
the three output legs of the drive. Each leg has one intelligent IGBT connected to
the positive bus voltage and one connected to the negative bus voltage. Alternately
switching on each leg, the intelligent IGBT produces an alternating voltage on
each of the corresponding motor windings. By switching each output intelligent
IGBT at a very high frequency (known as the carrier frequency) for varying time
intervals, the inverter is able to produce a smooth, three phase, sinusoidal output
current wave which optimizes motor performance.

6.2.2 CIRCUIT DESCRIPTION

The control section consists of a control board with a microprocessor, keypad
and display. Drive programming is accomplished via the keypad or the serial
communications port. During operation the drive can be controlled via the
keypad, by control devices wired to the control terminal strip, or by the the serial
communications port. The Power Board contains the control and protection
circuits which govern the six output IGBTs. The Power Board also contains a
charging circuit for the bus filter capacitors, a motor current feedback circuit, a
voltage feedback circuit, and a fault signal circuit. The drive has several built
in protection circuits. These include phase-to-phase and phase-to-ground short
circuit protection, high and low line voltage protection, protection against excessive
ambient temperature, and protection against continuous excessive output current.
Activation of any of these circuits will cause the drive to shut down in a fault
condition.

6.2.3 MCH INPUTS & OUTPUTS

The drive has two analog inputs (0-10 VDC and 4-20 mA) that can be used for
speed reference, PID setpoint reference, or PID feedback. A speed potentiometer
(10,000 Ohm) can be used with the 0-10 VDC input.

There are also two analog outputs: one is proportional to speed (frequency), and
the other is proportional to load.

The standard MCH drive has three programmable outputs for status indication:
one Form C Relay and two open-collector outputs.

Refer to Sections 14.0 - CONTROL WIRING and 15.0 - MCH CONTROL
WIRING DIAGRAMS for more information.

17

7.0 INSTALLATION

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

WARNING!

DRIVES MUST NOT BE INSTALLED WHERE SUBJECTED TO ADVERSE
ENVIRONMENTAL CONDITIONS! DRIVES MUST NOT BE INSTALLED
WHERE SUBJECTED TO: COMBUSTIBLE, OILY, OR HAZARDOUS
VAPORS OR DUST; EXCESSIVE MOISTURE OR DIRT; STRONG
VIBRATION; EXCESSIVE AMBIENT TEMPERATURES. CONSULT AC
TECHNOLOGY FOR MORE INFORMATION ON THE SUITABILITY OF

A DRIVE TO A PARTICULAR ENVIRONMENT.

The drive should be mounted on a smooth vertical surface capable of safely
supporting the unit without vibrating. The LCD display has an optimum field of
view, this should be considered when determining the mounting position.

Maintain a minimum spacing around the drive as follows:

SPACING REQUIREMENTS

HP

0.25 - 5 2 50

7.5 - 25 4 100

30 - 60 6 150

75 - 250 8 200

SPACING

INCHES mm

All drive models MUST be mounted in a vertical position for proper heatsink
cooling. Fans or blowers should be used to insure proper cooling in tight quarters.
Do not mount drives above other drives or heat producing equipment that would
impede the cooling of the drive. Note the ambient operating temperature ratings
for each drive model.

If it is necessary to drill or cut the drive enclosure or panel, extreme care must be
taken to avoid damaging drive components or contaminating the drive with metal
fragments (which cause shorting of electrical circuits). Cover drive components
with a clean cloth to keep out metal chips and other debris. Use a vacuum cleaner
to clean drive components after drilling, even if chips do not appear to be present.
Do not attempt to use positive air pressure to blow chips out of drive, as this tends
to lodge debris under electronic components. Contaminating the drive with metal
chips can cause drive failure and will void the warranty.

18

7.1 INSTALLATION AFTER A LONG PERIOD OF STORAGE

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

WARNING!

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.

7.2 EXPLOSION PROOF APPLICATIONS

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 Technology 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.”

19

8.0 INPUT AC REQUIREMENTS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

WARNING!

Hazard of electrical shock! Disconnect incoming power and wait three minutes
before servicing the drive. Capacitors retain charge after power is removed.

8.1 INPUT AC POWER REQUIREMENTS

8.1.1 VOLTAGE

Th e input vo ltage mu st matc h the driv e ’s namepl ate volt age rat i ng.
Voltage fluctuation must not vary by greater than 10% overvoltage or 15%
undervoltage.

NOTE: Drives with dual rated input voltage must be programmed for the
proper supply voltage. Refer to Parameter 0 - LINE VOLTS in Section 18.0

- DESCRIPTION OF PARAMETERS.

The drive is suitable for use on a circuit capable of delivering not more than
200,000 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’s power
components.

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.

8.1.2 SUPPLY TRANSFORMER kVA RATINGS

If the kVA rating of the AC supply transformer is greater than ten times the input
kVA rating of the drive, a drive isolation transformer, or a 2 - 3% input line reactor
(also known as a choke) must be added.

8.2 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 MCH drive is capable of withstanding up to 120% current overload for 60
seconds. Select a fuse or magnetic trip circuit breaker rated at 1.25 times the input
current rating of the drive (the minimum size should be 10 amps, regardless of
input current rating). Refer to Section 5.0 – MCH RATINGS.

Minimum voltage rating of the protection device should be 250 Vac for 240/200
Vac rated drives, and 600 Vac for 480/400 Vac and 590/480 Vac drives.

20

Current limiting type fuses should be used when input fusing is required. Select

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

fuses with low I
Bussman type KTK-R, JJN, and JJS. Similar fuses with equivalent ratings by
other manufacturers may also be acceptable.

2

T values, rated at 200,000 AIC. Recommended fuses are

9.0 VOLTAGE SELECTION

MH200 Series drives are rated for 240/200 Vac, 50-60 Hz input. The drive will

function with input voltages of 200 to 240 Vac (+ 10%, - 15%), at 48 to 62 Hz.

MH400 Series drives are rated for 480/400 Vac, 50-60 Hz input. The drive will
function with input voltages of 400 to 480 Vac (+ 10%, - 15%), at 48 to 62 Hz.

MH500 Series drives are rated for 590/480 Vac, 50-60 Hz input. The drive will
function with input voltages of 480 to 590 Vac (+ 10%, - 15%), at 48 to 62 Hz.

10.0 POWER WIRING

WARNING!

Hazard of electrical shock. Disconnect incoming power and wait three minutes
before servicing the drive. Capacitors retain charge after power is removed.

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

Input fusing and a power disconnect switch or contactor MUST be wired in series
with terminals L1, L2, and L3. If one has not been supplied by AC Technology
Corporation, a disconnect means must be wired during installation. 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.

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.

21

11.0 MCH POWER WIRING DIAGRAM

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

This diagram applies to
standard MC H d r i v e s .
Refer to Appendix A for
Bypass power wiring, or
Appendix B for Option
Box power wiring.

THREE PHASE

AC MOTOR

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

T1 T2 T3 L1 L2 L3

GND

WARNING!

GNDGND

DISCONNECT

MEANS

(REQUIRED)

FUSED INPUT

VOLTAGE

IN S TA L L , WI R E , AND GR O U ND IN AC C ORDANCE WITH ALL
APPLICABLE CODES.

NOTES:

1. Wire the motor for the proper voltage per the output rating of the drive. Motor
wires MUST be run in a separate steel conduit away from control wiring and
incoming AC power wiring.

2. 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.

3. Remove any existing, and do not install, power factor correction capacitors
between the drive and the motor. Failure to do so will result in drive
damage.

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

5. Minimum wire voltage ratings: 300 V for 200 and 240 Vac systems, and 600
V for 400, 480, and 590 Vac systems.

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

7. Wire and ground in accordance with NEC or CEC, and all applicable local
codes.

22

12.0 INITIAL POWER UP

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

WARNING!

Hazard of electrical shock! Wait three minutes after disconnecting incoming
power before servicing drive. Capacitors retain charge after power is
removed.

Before attempting to operate the drive, motor, and driven equipment be sure all
procedures pertaining to installation and wiring have been properly followed.

WARNING!

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.

Disconnect the driven load from the motor. Verify that the drive input terminals
(L1, L2, and L3) are wired to the proper input voltage per the nameplate rating
of the drive.

WARNING!

DO NOT connect incoming AC power to output terminals T1, T2, and T3! Do
not cycle input power to the drive more than once every two minutes. Damage
to the drive will result.

Energize the incoming power line. The LCD display should light and flash
“TESTING” and then show the voltage and horsepower rating of the drive. The
display should then look like the example display below, which indicates that
the drive is in a STOP state, the speed setpoint is 20.00 Hz, and there is no load
(because it is not running):

KSTOP > 20.00 HZ
0 % LOAD OFF

NOTE: If the drive is equipped with Bypass, the drive will not power up unless
the Drive Mode/Off/Bypass Mode switch is in the Drive Mode position, or the
Drive Test/Off/Drive Normal switch is in the Drive Test position.

23

If the display does not appear, remove the incoming power, wait three minutes for

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

the bus capacitors to discharge, and verify correct installation and wiring. If the
wiring is correct, re-apply incoming power and note the display for drive status.
If the display still does not appear call the factory for assistance.

Follow the procedure given below to check the motor rotation:

1. Use the  key to decrease the speed setpoint to the minimum value allowed
(0.50 Hz if Parameter 10 - MIN FREQ has not been changed).

2. Press the HAND (START) key. The drive should indicate RUN, but if the speed
setpoint is 0.50 Hz, the motor may not rotate. Press the  key to increase the
speed setpoint until the motor starts to rotate.

3. If the motor is rotating in the wrong direction, press the OFF (STOP) key
and remove power from the drive. Wait three minutes for the bus capacitors
to discharge, and swap any two of the motor wires connected to T1, T2, and
T3.

NOTE 1: The drive is phase insensitive with respect to incoming line voltage.
Therefore, to change the motor rotation, the phases must be swapped at the drive
output terminals or at the motor.

NOTE 2: If the drive is equipped with the Bypass option, motor rotation must
be checked in both drive mode and bypass mode:

To check rotation in Drive mode:

1. Select Drive Mode using the Drive Mode/Off/Bypass Mode switch.

2. Select Drive Normal using the Drive Test/Off/Drive Normal switch.

3. Select HAND using the HAND/OFF/AUTO switch. The drive should start,
allowing the motor rotation to be checked.

To check rotation in Bypass mode:

1. Select Bypass Mode using the Drive Mode/Off/Bypass Mode switch.

2. Select Drive Normal using the Drive Test/Off/Drive Normal switch.

3. Momentarily put the Hand/Off/Auto switch into Hand to "bump" the motor
so rotation can be checked.

If rotation is incorrect in both modes, swap any two motor leads at the output
terminals (thermal overload terminals).

If rotation is correct in drive mode, but incorrect in bypass mode, swap any two
leads at the main input power terminals.

If rotation is incorrect in drive mode, but correct in bypass mode, swap any two
leads at the main input terminals AND any two leads at the output terminals
(thermal overload terminals).

24

13.0 KEYPAD CONTROL

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The drive can be operated in a number of different ways: keypad (HAND),
control devices wired to the terminal strip (AUTO), serial communications
(SERIAL), or combinations of each. The drive should first be operated in HAND
mode during initial start-up. Refer to Sections 14.0 - CONTROL WIRING, and

18.0 - DESCRIPTION OF PARAMETERS for information on remote (AUTO)
operation.

13.1 KEYPAD FUNCTIONS (in Keypad H/O/A mode)

HAND (START) To start the drive, press the HAND (START) key.

OFF (STOP) To stop the drive, press the OFF (STOP) key.
NOTE: The OFF (STOP) key is active in both HAND

and AUTO modes.

AUTO (START) Puts the drive into AUTO mode.
Close TB-1 to TB-2 to start the drive.
Open TB-1 to TB-2 to stop the drive.

SPEED SOURCE Selects the speed reference source. Press this key to

select the desired speed reference, and then press the
ENTER key within three seconds to confirm the change.
The choices are described below:

HAND ONLY: Drive speed is determined by the setting

of Parameter 29 - HAND SOURCE.

AUTO ONLY: Drive speed is determined by the setting

of Parameter 24 - AUTO SOURCE.

NORM SRC: In HAND mode, speed is determined by

the setting of Parameter 29 - HAND SOURCE.

In AUTO mode, speed is determined by the setting of

Parameter 24 - AUTO SOURCE.

SPEED SETPOINT To increase the speed setpoint, press the  key. To

decrease the speed setpoint, press the  key.

NOTE: The  and  keys are only active if another

speed reference source is not selected.

FAULT RESET Use the OFF (STOP) key to reset a fault. If the fault

condition has passed, pressing the STOP key will clear
the fault and return the drive to a STOP condition.

NOTE: If an OUTPUT fault occurs, there will be a 30

second delay before the fault can be cleared using the
STOP key.

25

13.2 MCH DISPLAY

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The following describes the possible display configurations for the MCH Series
drive when operating as a standard drive (without PID control). Refer to Section

19.0 - MCH PID SETPOINT CONTROL for a complete description of drive

operation when using PID control.

13.2.1 MCH DISPLAY IN STOP MODE

When the drive is in the STOP mode, there are two possible displays: load
and motor voltage. The standard display indicates % LOAD, which is shown

DRIVE

STATUS

DIRECTION
(FORWARD)

SPEED

SETPOINT

SPEED

UNITS

KSTOP > 20.00 HZ
0 % LOAD OFF

LOAD

METER

NOTE: See Parameter 31 - UNITS for the SPEED UNITS display options.

Pressing the ENTER key will change the display from the % LOAD indication
to the VAC (motor voltage) indication:

DRIVE

STATUS

DIRECTION
(FORWARD)

HAND/OFF/AUTO

SPEED

SETPOINT

STATUS

SPEED
UNITS

KSTOP > 20.00 HZ
0 VAC OFF

MOTOR

VOLTAGE

HAND/OFF/AUTO

STATUS

Pressing ENTER again will change the display back to the % LOAD indication.

26

The following table shows the possible DRIVE STATUS indications that can

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

appear on the drive display:

DRIVE STATUS TABLE

DISPLAY DESCRIPTION

KSTOP KEYPAD STOP - The drive was stopped using the OFF (STOP) key.

RSTOP REMOTE STOP - The drive was stopped by opening TB-1 to TB-2.

SSTOP SERIAL STOP - The drive was stopped through the serial link.

RUN Drive is in RUN mode and is within + 0.5 Hz of the speed setpoint.

Drive has shut down due to a FAULT condition. If the fault condition has

FAULT

LOCK Drive is in FAULT LOCKOUT after five unsuccessful restart attempts.

BRAKE DC BRAKE is energized.

LIMIT

F DEC Drive is in DECEL FREEZE because DECEL is set too fast.

passed, pressing the HAND (OFF) key will clear the fault and return the
drive to the STOP mode.

Drive is in CURRENT LIMIT due to an overloaded motor, or ACCEL is set
too fast.

13.2.2 MCH DISPLAY IN RUN MODE

When the drive is in the RUN mode, the default display will look like this:

DRIVE

STATUS

DIRECTION
(FORWARD)

SPEED

SETPOINT

SPEED
UNITS

RUN > 60.00 HZ
86 % LOAD HAND

LOAD

METER

HAND/OFF/AUTO

STATUS

27

As in the STOP mode, the ENTER key can be used to toggle the display from %

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

LOAD to VAC (motor voltage):

DRIVE

STATUS

DIRECTION
(FORWARD)

SPEED

SETPOINT

SPEED

UNITS

RUN > 60.00 HZ
460 VAC HAND

MOTOR

VOLTAGE

NOTE: During acceleration and deceleration to the SPEED SETPOINT, the
DRIVE STATUS will show the actual drive speed. When the SPEED SETPOINT
is reached, the DRIVE STATUS will change to RUN (or STOP if the drive is
decelerating to a STOP).

HAND/OFF/AUTO

STATUS

13.2.3 MCH DISPLAY IN FAULT MODE

When the drive trips on a fault, the display will automatically change to the FAULT
display, which indicates the FAULT MESSAGE:

DRIVE

STATUS

DIRECTION

(FORWARD)

SPEED

SETPOINT

SPEED
UNITS

FAULT > 60.00 HZ
OVERLOAD HAND

FAULT

MESSAGE

HAND/OFF/AUTO

STATUS

In FAULT mode, the ENTER key will toggle the display between three screens:
FAULT, % LOAD and VAC. The DRIVE STATUS for these displays will be
FAULT. An example is shown below of the drive in the FAULT mode displaying
% LOAD:

DRIVE

STATUS

DIRECTION

(FORWARD)

SPEED

SETPOINT

SPEED
UNITS

FAULT > 60.00 HZ
0 % LOAD HAND

FAULT

MESSAGE

NOTE: To clear a FAULT, press the OFF (STOP) key, issue a remote STOP
command at TB-1, or use TB-13D (refer to Parameter 50 - TB13D INPUT).

HAND/OFF/AUTO

STATUS

28

13.2.4 MCH DISPLAY IN AUXILIARY MODE

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

If the ENTER key is held down, the display will enter the auxiliary mode and
cycle between two displays: a CONTROL display that indicates the H/O/A source
(keypad or terminal strip), speed reference source, and the setting of the SPEED
SOURCE key on the keypad; and a TIME/kWh display that indicates total elapsed
run time and kilowatt hours. When the ENTER key is released, the display will
return to the previous screen. Examples of theses displays are shown below:

H/O/A

SOURCE

KEYPAD HOA - KEY
SRC=NORM

SPEED SOURCE

KEY SETTING

CONTROL DISPLAY

SPEED

REFERENCE

TIME: 4872.7 HRS
KWH: 49345

TIME / KWH DISPLAY

The table below shows the possible SPEED REFERENCE SOURCE indications
for the CONTROL display in the auxiliary mode:

SPEED REFERENCE SOURCE TABLE

DISPLAY DESCRIPTION

KEY

VDC

IDC

KEYPAD -

0 - 10 VDC analog input at TB-5A (In PID mode, this indicates that the
SETPOINT reference is a 0-10 VDC signal).

4 - 20 mA analog input at TB-5B (In PID mode, this indicates that the
SETPOINT reference is a 4-20 mA signal).

 and  keys.

SP#1 - SP#4 PRESET SPEED #1 - PRESET SPEED #4

MKB

AKB

MANUAL KEYBOARD - The
control. This occurs in PID mode when the drive is put into HAND
(open-loop) mode.

AUTO KEYBOARD - The
SETPOINT reference. This occurs in PID mode when the drive is put
into AUTO (closed-loop) mode.

 and  keys are used for speed

 and  keys are used as the PID

29

14.0 CONTROL WIRING

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

14.1 GENERAL

This section describes control wiring for standard MCH drives. Refer to
Appendix A for control wiring for the Bypass option, or Appendix B for
control wiring for the Option Box.

14.1.1 KEYPAD CONTROL

The drive can be controlled by the keypad or by control devices wired to the terminal
strip. The drive will run from the keypad “out of the box”, requiring no connections
to the terminal strip. Refer to Section 13.0 - KEYPAD CONTROL.

14.1.2 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 grounded at the drive
chassis ONLY. Recommended control wire is Belden 8760 (2-wire) or 8770 (3­wire), or equivalent.

Torque the control terminals to 2 lb-in (0.2 Nm). Be careful not to overtorque
the terminals, as this will cause damage to the terminal strip. This is not covered
under warranty and can only be repaired by replacing the control board.

14.1.3 TB-2: CIRCUIT COMMON

The TB-2 terminals are used as circuit common for the start/stop, input select,
analog input, and analog output functions. There are three TB-2 terminals available
on the terminal strip, and they are all internally connected to each other on the
main control board. If necessary TB-2 may be connected to chassis ground.

NOTE: TB-2 MUST be connected to chassis ground when using serial
communications.

14.1.4 SURGE SUPPRESSION ON RELAYS

Current and voltage surges and spikes in the coils of contactors, relays, solenoids,
etc, near or connected to the drive, can cause erratic drive operation. Therefore,
a snubber circuit should be used on coils associated with the drive. For AC coils,
snubbers should consist of a resistor and a capacitor in series across the coil.
For DC coils, a free-wheeling or flyback diode should be placed across the coil.
Snubbers are typically available from the manufacturer of the device.

30

14.2 START/STOP AND SPEED CONTROL

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

14.2.1 START/STOP CONTROL IN KEYPAD H/O/A MODE

In Keypad H/O/A mode, the HAND (START) and AUTO (START) keys on the
keypad are used to select HAND and AUTO modes. When the HAND (START)
key is pressed, HAND mode is selected and the drive starts immediately. When the
drive is put into AUTO mode, it will respond to an external start/stop command.
This is done as follows:

1. Press the AUTO key on the keypad. The H/O/A STATUS portion of the display
will indicate AUTO.

2. Wire a normally open maintained contact between TB-1 and TB-2 on the
terminal strip. Close the contact to start the drive, and open the contact to
stop the drive.

Refer to the wiring diagram in Section 15.2.

14.2.2 START/STOP CONTROL IN REMOTE H/O/A MODE

In Remote H/O/A mode, the terminal strip is used to select HAND and AUTO
modes. This is done as follows:

1. Program TB-13C (Parameter 49) to HAND. Once this is done, the HAND
(START) and AUTO (START) keys on the keypad will be disabled.

2. Wire a contact between TB-13C and TB-2. Close this contact to select HAND
mode.

NOTE: When HAND mode is selected, TB-1 must be closed to TB-2 to allow

the drive to run. Therefore, when TB-13C is closed to TB-2, TB-1 must also
be closed to TB-2 by some means (another set of contacts, etc).

3. Wire a contact between TB-12A and TB-2. Close this contact to select AUTO
mode.

4. Wire a normally open maintained contact between TB-1 and TB-2. In AUTO
mode (TB-12A closed to TB-2), close this contact to start the drive and open
this contact to stop the drive.

Refer to the wiring diagram in Section 15.3.

NOTE: If the drive is operating in Remote H/O/A mode, and the OFF (STOP)
key on the keypad is used to stop the drive (instead of using the OFF position of
the remote H/O/A switch), the HAND (START) or AUTO (START) key must be
pressed to cancel the keypad stop and allow the drive to start again.

31

14.2.3 SPEED REFERENCE SIGNALS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The drive allows for three analog speed reference inputs: a speed potentiometer
(10,000 Ohm), 0-10 VDC, or 4-20 mA.

SPEED POT Connect the wiper to terminal TB-5A, and connect the high and

low end leads to terminals TB-6 and TB-2, respectively.

0-10 VDC Wire the positive to terminal TB-5A and the negative to terminal

TB-2. TB-5A input impedance is 200 kilohms.

4-20 mA Wire the positive to terminal TB-5B and the negative to terminal

TB-2. TB-5B input impedance is 100 Ohms.

14.2.4 SPEED REFERENCE SELECTION

In HAND mode, the speed reference source will be determined by the setting of
Parameter 29 - HAND SOURCE.

In AUTO mode, the speed reference source will be determined by the setting of
Parameter 24 - AUTO SOURCE.

The SPEED SOURCE key on the keypad can be used to change the speed reference
source. When NORM SRC is selected, the above statements are true. However,
the SPEED SOURCE key can also be used to select HAND ONLY or AUTO
ONLY, which forces the drive speed to be controlled from the HAND SOURCE
(Parameter 29) or the AUTO SOURCE (Parameter 24), regardless of whether the
drive is in HAND or AUTO mode.

Speed references can also be selected using TB-13A, 13B, and 13C on the terminal
strip. If HAND SOURCE and/or AUTO SOURCE are set to SELECTED, the
speed source will be whatever speed reference is selected using TB-13A, 13B, or
13C (0-10 VDC, 4-20 mA, preset speeds, etc). Refer to Parameters 47, 48, and
49 in Section 18.0 - DESCRIPTION OF PARAMETERS.

0 - 10 VDC and 4 - 20 mA INPUT SIGNALS

HAND SOURCE (Parameter 29) and AUTO SOURCE (Parameter 24) can be set
for 0-10 VDC or 4-20 mA.

If HAND SOURCE and/or AUTO SOURCE are set to SELECTED, TB-13A,
TB-13B, and TB-13C can all be used to select 0-10 VDC or 4-20 mA input.

32

PRESET SPEEDS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

HAND SOURCE (Parameter 29) and AUTO SOURCE (Parameter 24) can be set
to PRESET #1 - PRESET #4.

If HAND SOURCE and/or AUTO SOURCE are set to SELECTED, TB-13A
can be programmed to select PRESET #1, TB-13B to select PRESET #2, and
TB-13C to select PRESET #3. Closing any two of these terminals to TB-2 will
select PRESET #4. Refer to Parameters 1-4: PRESET #1 - #4 in Section 18.0

- DESCRIPTION OF PARAMETERS.

MOP - MOTOR OPERATED POT

MOP allows the drive speed to be adjusted using contact closures (one for increase
and another for decrease).

HAND SOURCE (Parameter 29) and AUTO SOURCE (Parameter 24) can be set
to MOP. This requires that TB-13A (Parameter 47) be set to DECREASE FREQ,
and TB-13B (Parameter 48) be set to INCREASE FREQ. Close TB-13A to TB-2
to decrease the drive speed, and close TB-13B to TB-2 to increase the drive speed.
Once the desired speed is reached, release the contact, and the drive speed will
hold at that value. The DECREASE FREQ function will work when the drive is
in a STOP or RUN mode. The INCREASE FREQ function will only work while
the drive is in a RUN mode.

If HAND SOURCE and/or AUTO SOURCE is set to SELECTED, TB-13A and
TB-13B can be programmed for this function. Program TB-13A (Parameter 47)
to DECREASE FREQ, and TB-13B (Parameter 48) to INCREASE FREQ. Refer
to the description of operation above .

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-2, the higher terminal
has priority and will override the others. For example, if TB-13A is programmed
to select 0-10VDC, and TB-13C is programmed to select PRESET #3, closing
both terminals to TB-2 will cause the drive to respond to PRESET #3, because
TB-13C overrides TB-13A.

14.2.5 ANALOG OUTPUT SIGNALS

There are two terminals that can supply analog output signals proportional to
output frequency and load. Terminal TB-10A can provide a 0-10 VDC or a 2­10 VDC signal proportional to output frequency, and TB-10B can provide the
same signals proportional to load. The 2-10 VDC signals can be converted to a
4-20 mA signal using a resistor in series with the signal such that the total circuit
resistance is 500 Ohms. See Parameters: 42 - TB10A OUTPUT, 43 - TB10A
SCALING, 44 - TB10B OUTPUT, and 45 - TB10B SCALING in Section 18.0

- DESCRIPTION OF PARAMETERS.

33

14.2.6 DRIVE STATUS OUTPUTS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The control board has one Form C relay at terminals TB-16, TB-17, and TB-18.
Contacts are rated 2 amps at 28 VDC or 120 Vac.

There are also two open-collector outputs at terminals TB-14 and TB-15. The open­collector circuit is a current-sinking type rated at 30 VDC and 40 mA maximum.
A power supply (30 VDC max) must be used to power the open-collector outputs.
The standard drive does not have a power supply (a 24 VDC power supply is
optional when the drive is equipped with the Bypass option).

The Form C relay and open-collector outputs can be programmed for many
different status indications. See Parameters 52 - TB14/RELAY #2, 53 - TB15/
RELAY #3, and 54 - RELAY #1.

NOTE: The Bypass option includes two Form C relays and a third is optional
(refer to Appendix A). When the drive is equipped with the Option Box, there are
two Form C relays and two open-collector outputs (refer to Appendix B).

34

15.0 MCH CONTROL WIRING DIAGRAMS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The following wiring diagrams apply to standard MCH drives. Refer to
Appendix A for control wiring for the Bypass option, or Appendix B for
control wiring for the Option Box.

15.1 MCH TERMINAL STRIP

Shown below is the terminal strip on the main control board, along with a brief
description of the function of each terminal.

FORM C

The TB-2 terminals are internally tied together

RELAY

1 2 5A 5B 6

RUN / STOP

0-10 VDC SPEED REFERENCE INPUT

CIRCUIT COMMON

10A 12A RXA TXB10B 2 13A 13B

10 VDC SUPPLY FOR SPEED POT

0-10 OR 2-10 VDC OUTPUT: FREQUENCY

4-20 mA SPEED REFERENCE INPUT

0-10 OR 2-10 VDC OUTPUT: LOAD

AUTO MODE SELECT

CIRCUIT COMMON

TB-13A FUNCTION SELECT

13C

TB-13B FUNCTION SELECT

TB-13C FUNCTION SELECT

15 2

13D 14

TB-13D FUNCTION SELECT

CIRCUIT COMMON

OPEN-COLLECTOR OUTPUT

OPEN-COLLECTOR OUTPUT

COMMUNICATIONS

16 17 18

RS-485 SERIAL

NOTE: The function of terminals TB-10A, TB-10B, TB-13A, TB-13B, TB-13C,
TB-13D, TB-14, TB-15, TB-16, and TB-18 are dependent on the programming
of certain parameters. In most cases, the name of the parameter matches the
number of the terminal, allowing quick and easy programming of the terminals
to suit the application. The exception is TB-16 and TB-18, which are governed
by Parameter 54 - RELAY.

A complete description of operating the drive in the AUTO mode can be found in
Section 14.2. The following diagrams provide a quick reference to wire the drive
for the most common configurations.

35

15.2 KEYPAD H/O/A

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

When the drive is in Keypad H/O/A mode, the AUTO (START) key on the keypad
is used to put the drive into AUTO mode. The drive will then respond to start/stop
commands from the terminal strip. The start/stop circuit is wired as shown below.
Also shown is the wiring for a 4-20 mA or 0-10 VDC speed reference signal.

FORM C

The TB-2 terminals are internally tied together

RELAY

1 2 5A 5B 6

CIRCUIT COMMON

RUN / STOP

4-20 mA INPUT

0-10 VDC INPUT

MAINTAINED

RUN/STOP

CONTACT

10A 12A RXA TXB10B 2 13A 13B

CIRCUIT COMMON

13C

13D 14

NOTES:

1. Close TB-1 to TB-2 to RUN, and open to STOP.

15 2

16 17 18

2. When the drive is put into AUTO mode, the speed reference will be determined
by AUTO SOURCE (Parameter 24). In the example above, the AUTO speed
reference is either a 4-20 mA or 0-10 VDC signal.

3. When HAND mode is selected, the drive starts immediately. TB-1 has no
effect.

36

15.3 REMOTE H/O/A

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

Shown below is the wiring diagram for selecting H/O/A from the terminal strip.
Also shown is the wiring for a 0-10 VDC or 4-20 mA speed reference signal. In
HAND mode, TB-1 must be closed to TB-2 in order to start the drive. In AUTO
mode, close TB-1 to TB-2 to RUN, and open to STOP

FORM C

The TB-2 terminals are internally tied together

RELAY

1 2 5A 5B 6

CIRCUIT COMMON

RUN / STOP

4-20 mA INPUT

0-10 VDC INPUT

MAINTAINED

RUN/STOP CONTACT

(AUTO MODE ONLY)

10A 12A RXA TXB10B 2 13A 13B

CIRCUIT COMMON

AUTO MODE SELECT

13C

HAND MODE SELECT

OFF

AUTO

HAND

OFF

AUTO

13D 14

HAND

15 2

CIRCUIT COMMON

16 17 18

NOTES:

1. Program TB-13C (Parameter 49) to HAND. This forces TB-12A to act as
AUTO.

2. In AUTO mode (TB-12A closed to TB-2), close TB-1 to TB-2 to RUN, and
open to STOP. The speed reference will be determined by AUTO SOURCE
(Parameter 24).

3. When HAND mode is selected (TB-13C closed to TB-2), TB-1 must also be
closed to TB-2 in order to RUN. The speed reference will be determined by
HAND SOURCE (Parameter 29).

37

15.4 SPEED POT AND PRESET SPEED CONTROL

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

In this example, the drive is in Keypad H/O/A mode. In HAND mode, speed is
controlled from the speed pot. In AUTO mode, speed is controlled by the selected
PRESET SPEED.

FORM C

The TB-2 terminals are internally tied together

RELAY

1 2 5A 5B 6

CIRCUIT COMMON

RUN / STOP

0-10 VDC INPUT

MAINTAINED

RUN/STOP

CONTACT

10A 12A RXA TXB10B 2 13A 13B

10 VDC SUPPLY

SPEED POT

(10 K)

CIRCUIT COMMON

PRESET SPEED #1

PRESET SPEED #2

13C

13D 14

PRESET SPEED #3

15 2

CIRCUIT COMMON

NOTES:

1. Program the PRESETS (Parameters 1-4) to the desired values.

16 17 18

2. Program TB-13A to PRESET #1, TB-13B to PRESET #2, and TB-13C to
PRESET #3 (Parameters 47-49). Close any two to select PRESET #4.

3. Program HAND SOURCE (Parameter 29) to 0-10 VDC. In HAND mode,
the speed will be controlled by the speed pot.

4. Program AUTO SOURCE (Parameter 24) to SELECTED. In AUTO mode,
the speed will be controlled by the preset speeds.

38

16.0 PROGRAMMING THE MCH DRIVE

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The MCH keypad serves two purposes: operating the drive when in the LOCAL
mode, and programming the parameters for particular applications. The keypad
is shown below, along with the display that should appear when the drive is first
powered up:

STOP > 20.00 HZ
0 % LOAD OFF

PROG

RUN

ENTER

AUTO

(START)

SPEED

SOURCE

HAND

(START)

OFF

(STOP)

To program the drive, the PROGRAM mode must be entered by pressing the
PROG/RUN button. If the password protection is disabled, pressing the PROG/
RUN button will result in direct entry into the PROGRAM mode. If the password
protection is enabled, the PASSWORD prompt will appear when an attempt is made
to enter the PROGRAM mode. The PASSWORD prompt appears as follows:

PASSWORD
0000

CURSOR

To enter the password, use the

 and  keys to scroll to the password value, and

then press the ENTER key.

NOTE: The factory default password is 0019.

39

Once the correct password is entered, the PROGRAM mode will be entered and

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

the first parameter will be displayed, which is Parameter 0 - LINE VOLTS. This
is shown below:

PARAMETER

NUMBER

PARAMETER

NAME

PARAMETER

VALUE

0 LINE VOLTS
AUTO

CURSOR

To scroll through the parameters, use the

 and  keys on the keypad. When

the desired parameter is found, press the ENTER key to shift the cursor from the
parameter name to the parameter value. In this example, the cursor shifts from
LINE VOLTS to AUTO:

PARAMETER

NUMBER

PARAMETER

NAME

PARAMETER

VALUE

0 LINE VOLTS
AUTO

CURSOR

The parameter value can then be changed using the  and  keys. If the parameter
has a numerical value, the  key will increase the value and the  key will
decrease the value. If the parameter has specific choices that can be selected, the
 and  keys will scroll through the list of possible settings. When the desired
value or option is selected, press the ENTER key to store the new setting. If the
new setting is not ENTERED, it will not take effect and the old setting will still
be valid.

If the PROG/RUN key is pushed while the cursor is highlighting the parameter
value, the value will change back to the original setting (if it had been changed, but
not ENTERED), and the cursor will shift back to the parameter name. Pressing
PROG/RUN again will exit the PROGRAM mode. If the PROGRAM mode is
entered again within two minutes, the last parameter that was viewed, or changed,
will come up on the display. After two minutes has elapsed, the password will
have to be entered again when attempting to access the PROGRAM mode.

40

17.0 PARAMETER MENU

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAMETER MENU

PARAM.

NUMBER

0 LINE VOLTS HIGH, LOW, AUTO AUTO

1 PRESET #1 (NOTE 1) 20.00 Hz

2 PRESET #2 (NOTE 1) 20.00 Hz

3 PRESET #3 (NOTE 1) 20.00 Hz

4 PRESET #4 (NOTE 1) 20.00 Hz

5 SKIP FREQ #1 .00 Hz - MAXIMUM FREQ .00 Hz

6 SKIP FREQ #2 .00 Hz - MAXIMUM FREQ .00 Hz

7 BANDWIDTH .00 - 10.00 Hz 1.00 Hz

8 ACCEL RATE (NOTE 1) 30.0 SEC

9 DECEL RATE (NOTE 1) 30.0 SEC

10 MINIMUM FREQ .00 - MAXIMUM FREQ .50 Hz

11 MAXIMUM FREQ MINIMUM FREQ - 120.0 Hz 60.00 Hz

12 DC BRAKE VOLT (NOTE 1) .0 VDC

13 DC BRAKE TIME .0 - 999.9 SEC .0 SEC

14 DYNAMIC BRAKE OFF, ON OFF

PARAMETER

NAME

RANGE OF

ADJUSTMENT

FACTORY
DEFAULT

16 CURRENT LIMIT 25 - 120 % 120 %

17 MOTOR OVRLOAD 25 - 100 % 100%

18 BASE FREQ 20.00 - 360.0 Hz 60.00 Hz

19 FIXED BOOST .0 - 30.0 % (NOTE 1)

22 TORQUE

23 CARRIER FREQ 2.5, 6, 8, 10, 12, 14 kHz 2.5 kHz

NOTE 1: REFER TO SECTION 18.0 - DESCRIPTION OF PARAMETERS.

CONSTANT, VARIABLE,

CONST / NO COMP

CONSTANT

41

PARAMETER MENU

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAM.

NUMBER

24 AUTO SOURCE

25 START METHOD

26 STOP METHOD RAMP, COAST COAST

28 SPEED SRC KEY ENABLED, DISABLED ENABLED

29 HAND SOURCE

30 CONTROL

31 UNITS

32 HZ MULTIPLIER .10 - 650.0 1.00

33 UNITS DECIMAL

34 LOAD MULTIPLY 95 - 139 % 100%

35 LCD CONTRAST LOW, MED, HIGH MED

36 SLEEP THRSHLD .00 - 360.0 Hz .00 Hz

37 SLEEP DELAY .0 - 300 SEC 30.0 SEC

38 SLEEP BANDWID FB @ MIN - FB @ MAX 0%

39 TB5 MIN FREQ .00 - 360.0 Hz .00 Hz

40 TB5 MAX FREQ .00 - 360.0 Hz 60.00 Hz

41 AN INPUT FLTR 0.01 - 10.0 SEC 0.02 SEC

42 TB10A OUTPUT NONE, 0-10V, 2-10V NONE

PARAMETER

NAME

RANGE OF

ADJUSTMENT

KEYPAD, 0-10 VDC, 4-20 MA,

PRESET #1, PRESET #2,

PRESET #3, PRESET #4,

MOP, SELECTED

NORMAL, POWER UP,

AUTO 1, AUTO 2, AUTO 3

KEYPAD, 0-10 VDC, 4-20 MA,

PRESET #1, PRESET #2,

PRESET #3, PRESET #4,

MOP, SELECTED

NORMAL, NORM NO HAND,

SERIAL AUTO, S AUTO/NO HND

speed: HERTZ, RPM, % HZ,

/SEC, /MIN, /HR, GPH, NONE

speed: HERTZ

pid: %, PSI, FPM, CFM, GPM, IN,

FT, /SEC, /MIN, /HR, F, C, MPM, GPH

XXXXX, XXX.X, XX.XX,

X.XXX, .XXXX

FACTORY
DEFAULT

4-20 MA

NORMAL

KEYPAD

NORMALSERIAL SPEED, S SPD/NO HAND,

XXXXX

42

PARAMETER MENU

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAM.

NUMBER

43 TB10A SCALING 3.00 - 360.0 Hz 60.00 Hz

44 TB10B OUTPUT NONE, 0-10V, 2-10V NONE

45 TB10B SCALING 10 - 200 % 125 %

47 TB13A INPUT

48 TB13B INPUT

49 TB13C INPUT

50 TB13D INPUT

52 TB14/RELAY #2 CURRENT LIMIT, AUTO/HAND

53 TB15/RELAY #3 SRC, FOLLOWER PRES, NONE

54 RELAY #1 MIN/MAX ALARM, INV MIN/MAX A,

55 TB5B LOSS FAULT, PRESET #3 FAULT

56 SERIAL LOSS FAULT, AUTO FAULT

57 SERIAL

58 SERIAL ADDRES 1 - 247 30

61 PASSWORD 0000 - 9999 0019

63 SOFTWARE VERS (VIEW - ONLY) (N/A)

64 MONITOR MODE OFF, ON ON

PARAMETER

NAME

RANGE OF

ADJUSTMENT

NONE, 0-10VDC, 4-20MA,

FREQ, REVERSE

NONE, 0-10VDC, 4-20MA,

PRESET #2, INCREASE FREQ

NONE, 0-10VDC, 4-20MA,

PRESET #3, HAND, REVERSE

EXTERN FAULT,

EXTERN FAULTEXTERN /FAULT,

EXTERN CLEAR

NONE, RUN, FAULT, INVERSE

FAULT, FAULT LOCKOUT,

AT SPEED, ABOVE PRSET #3,

MIN ALARM, INV MIN ALARM,

MAX ALARM, INV MAX ALARM,

RUN REVERSE

DISABLED, WITH TIMER,

W/O TIMER

FACTORY
DEFAULT

NONEPRESET #1, DECREASE

NONE

NONE

DISABLED

43

PARAMETER MENU

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAM.

NUMBER

65 PROGRAM

66 CLEAR HISTORY MAINTAIN, CLEAR MAINTAIN

70 PID MODE OFF, NORMAL, REVERSE OFF

74 PID FEEDBACK TB-5A, TB-5B TB-5A

75 FEEDBACK @ MIN -32500 to 32500 0.0%

76 FEEDBACK @ MAX -32500 to 32500 100.0%

77 PROPOR. GAIN 0.0 - 999.9% 5.00%

78 INTEGRAL GAIN 0.0 - 10.0 SEC 0.0 SEC

79 DIFF. GAIN 0.0 - 10.0 SEC 0.0 SEC

80 PID ACCEL 0.0 - 100.0 SEC 30.0 SEC

81 MIN ALARM FB @ MIN - FB @ MAX 0.0%

82 MAX ALARM FB @ MIN - FB @ MAX 0.0%

98 LANGUAGE (NOTE 1) ENGLISH

99 FAULT HISTORY (VIEW - ONLY) (N/A)

NOTE 1: REFER TO SECTION 18.0 - DESCRIPTION OF PARAMETERS.

PARAMETER

NAME

RANGE OF

ADJUSTMENT

MAINTAIN, RESET 60,

RESET 50

FACTORY
DEFAULT

RESET 60

44

18.0 DESCRIPTION OF PARAMETERS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

0 LINE VOLTS

This parameter calibrates the drive based on the input voltage, and can be set
to AUTO, HIGH, or LOW. When set to AUTO, the drive automatically selects
HIGH or LOW based on the incoming voltage.

This parameter can also be set “manually”, using the HIGH or LOW settings.
Refer to the table below:

INPUT LINE VOLTAGE SELECTION

RATED INPUT

MODEL

MH200 240 / 200 Vac 3 220 - 240 Vac HIGH

MH400 480 / 400 Vac 3 460 - 480 Vac HIGH

MH500 590 / 480 Vac 3 575 - 600 Vac HIGH

VOLTAGE

240 / 200 Vac 3 200 - 208 Vac LOW

480 / 400 Vac 3 380 - 415 Vac LOW

590 / 480 Vac 3 460 - 480 Vac LOW

INPUT

PHASE

ACTUAL INPUT

VOLTAGE

PARAM.

SETTING

1-4 PRESET #1- #4

PRESETS are activated via contact closures between terminal TB-2 and terminals
TB-13A, TB-13B, and TB-13C. These terminals must be programmed as preset
selects using Parameters 47 - 49: TB13A INPUT, TB13B INPUT, and TB13C
INPUT.

In non-PID mode, PRESETS #1-#4 can be used as preset speeds. In this case, the
PRESETS are set in Hz, and can only be set to values within the range defined by
the minimum and maximum frequency (Parameters 10 and 11).

In PID mode, PRESETS #1, #2, and #4 can also be used as preset setpoints
(PRESET #3 cannot be used as a preset setpoint, only a preset speed). In this
case, PRESETS #1, #2, and #4 are set in actual PID units (the units selected in
Parameter 31 - UNITS), and can only be set to values within the range defined by
the minimum and maximum PID feedback (Parameters 75 and 76).

The following table shows how each preset is selected using the TB-13 terminals.
OPEN and CLOSED refer to the state of the TB-13 terminal relative to TB-2.

45

PRESET ACTIVATION

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PRESET # TB - 13A TB - 13B TB - 13C

1 CLOSED OPEN OPEN

2 OPEN CLOSED OPEN

3 OPEN OPEN CLOSED

CLOSED CLOSED OPEN

4 CLOSED OPEN CLOSED

OPEN CLOSED CLOSED

5,6 SKIP FREQ #1 & #2
7 BANDWIDTH

These parameters are used to prevent the drive from operating continuously
at critical frequencies that cause excessive mechanical vibration of the driven
equipment. The SKIP FREQUENCIES (Parameters 5 and 6) and the SKIP
BANDWIDTH (Parameter 7) are used to define up to two speed avoidance ranges.
The SKIP FREQUENCY settings define the starting point of the speed range that
is to be avoided, and the SKIP BANDWIDTH setting defines how far the speed
range extends beyond SKIP FREQUENCY. Setting the SKIP FREQUENCIES
to .00 Hz disables this function.

Example: The critical frequency is 21 Hz, and a bandwidth of 2 Hz is desired.
Therefore, set SKIP FREQ #1 to 20 Hz and set SKIP BANDWIDTH to 2 Hz. This
results in a speed range from 20 Hz to 22 Hz that the drive will not operate within
continuously. If the drive were operating at 25 Hz and then commanded to operate
at a speed within the range of avoidance, the drive would decelerate to 22 Hz and
remain at that frequency until commanded to 20 Hz or below. The drive would
then decelerate through the range of avoidance to the new frequency. Likewise,
if the drive were operating at 18 Hz, and then commanded to operate at a speed
within the range of avoidance, the drive would accelerate to 20 Hz and remain at
that frequency until commanded to a speed of 22 Hz or above. The drive would
then accelerate through the range of avoidance to the new frequency.

8 ACCEL RATE

ACCEL RATE sets the acceleration time for all speed reference sources (keypad,
speed pot, 4-20 mA, 0-10 VDC, and preset speeds). The ACCEL RATE setting is
the time to accelerate from 0 Hz to the BASE FREQUENCY (Parameter 18). The
range of adjustment depends on horsepower. Refer to the table below:

46

ACCELERATION LIMITS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

HORSEPOWER RANGE OF ADJUSTMENT

0.25 - 20 0.1 - 3600 SEC

25 - 60 0.3 - 3600 SEC

75 - 250 0.6 - 3600 SEC

Example: If ACCEL RATE is set to 30 seconds, and the BASE FREQUENCY
is set to 60 Hz, the drive will ramp from 0 Hz to 60 Hz in 30 seconds. This is a
linear function, therefore the drive would ramp up to 30 Hz in 15 seconds, etc.

NOTE: The ability to accelerate a given load at a particular rate is limited by
the output power capability of the drive/motor combination. The acceleration
of high-inertia and high-friction loads may be affected by the current limiting
characteristics of the drive. See Parameters 16 - CURRENT LIMIT and 19 ­FIXED BOOST for more information.

9 DECEL RATE

DECEL RATE sets the deceleration time for all speed reference sources. The
DECEL setting is the time to decelerate from BASE FREQUENCY to 0 Hz. As
with Parameter 8 - ACCEL RATE, this is a linear function. If the drive is set to
coast to a stop, DECEL will have no effect when a STOP command is given. The
range of adjustment for DECEL depends on horsepower, voltage, and whether
Dynamic Braking (DB) is being used. Refer to the table below:

DECELERATION LIMITS

HORSEPOWER / VOLTAGE RATING RANGE OF ADJUSTMENT

240 / 200 Vac 480 / 400 Vac 590 / 480 Vac WITHOUT DB WITH DB

(NOTE 1) (NOTE 2)

0.25 - 7.5 HP 1 - 7.5 HP ---- 0.3 - 3600 SEC 0.1 - 3600 SEC

10 - 15 HP 10 - 20 HP 1 - 7.5 HP 0.5 - 3600 SEC 0.1 - 3600 SEC

20 - 60 HP 25 - 60 HP 10 - 20 HP 1.0 - 3600 SEC 0.2 - 3600 SEC

---- 75 - 100 HP 25 - 60 HP 2.0 - 3600 SEC 0.2 - 3600 SEC

---- 125 - 250 HP 75 - 200 HP 4.0 - 3600 SEC 0.2 - 3600 SEC

NOTE 1: 240/120 Vac units have the same limits as 240/200 Vac units.

NOTE 2: This parameter can be set as low as the value shown in the WITH

DB column. However, the value shown in the WITHOUT DB column is the
operational limit of a drive without dynamic braking. For example, DECEL can
be set as low as 0.1 seconds on a 10 HP, 480 Vac drive without dynamic braking,
but the actual minimum deceleration time would be 0.5 seconds.

47

If an attempt is made to decelerate a high-inertia load too quickly, the motor

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

will regenerate voltage back into the drive. This will cause the DC bus voltage
to rise, which can result in a HI VOLTS fault. In order to prevent faulting, the
drive will enter DECEL FREEZE, which halts the deceleration until the DC bus
voltage returns to a normal level. The drive will then begin to decelerate again,
and if necessary, will enter DECEL FREEZE repeatedly to avoid faulting. If a
very short deceleration time is programmed, DECEL FREEZE may not be able
to compensate fast enough, resulting in a HI VOLTS fault.

In applications where very short deceleration times are required on high-inertia
loads, dynamic braking may be required. Consult the factory for more information
on the Dynamic Braking option.

10 MINIMUM FREQ

This parameter defines the lower limit of the drive’s speed range. MINIMUM
FREQ is used in conjunction with MAXIMUM FREQ (Parameter 11 below) to
define the operating range of the drive.

If MINIMUM FREQ is set to a value above 0.0 Hz, the drive will ramp up from

0.0 Hz when given a start command. Once running, however, the drive will not

operate below the MINIMUM FREQ setting unless the rotation is changed, or a
stop command is issued and the drive is programmed to ramp to a stop.

If MINIMUM FREQ is set to 0.0 Hz, the drive may be operated in ZERO SPEED
mode (drive is in RUN state, but there is no output to the motor). ZERO SPEED
operation can be used in applications requiring the ability to start and stop the
drive using only the selected speed reference. The drive will start when the speed
reference is raised above 0 VDC or 4 mA, and it will stop when the reference is
lowered to 0 VDC or 4 mA. Note that the drive must be initially started using
one of the normal start commands (keypad or terminal strip).

11 MAXIMUM FREQ

This parameter defines the upper limit of the drive’s speed range. MAXIMUM
FREQ is used in conjunction with MINIMUM FREQ (Parameter 10 above) to
define the operating range of the drive.

WARNING!

Consult motor manufacturer before operating motor above rated frequency.
Overspeeding the motor and/or driven equipment can cause damage to
equipment and injury to personnel!

12 DC BRAKE VOLT

DC braking creates a braking torque by injecting DC voltage into the motor. This
parameter sets the magnitude of that DC voltage.

48

The point at which the drive applies DC braking to the motor depends on which

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

STOP method is programmed (either COAST or RAMP, see Parameter 26 - STOP
METHOD).

If the drive is set to COAST, DC braking is activated when the stop command
is given. In this case, DC braking helps decelerate the motor. This is useful in
applications where a quick deceleration is desired on a load that would normally
take a long time to coast to a stop.

If the drive is set to RAMP, DC braking is activated when the output frequency
reaches 0 Hz. In this case, the drive decelerates the load to a near stop and then
DC braking is used to stop and hold the motor. This is useful in applications where
the load needs to be stopped in a certain position. Similar applications with high­inertia loads utilize both dynamic braking and DC braking. The dynamic braking
allows the high-inertia load to be decelerated quickly, while the DC braking stops
the load in the desired position.

Due to heat generated in the motor, DC braking should only be used in applications
where the load is stopped infrequently. In high duty-cycle applications, dynamic
braking is recommended because the heat is dissipated through external resistor
banks, rather than in the motor. When used, DC BRAKE VOLT should be set to
the lowest voltage that provides satisfactory operation in order to minimize motor
heating. The maximum voltage available depends on the voltage rating of the
drive. Refer to the table below:

MAXIMUM DC BRAKE VOLTAGE

MODEL MH200

240 / 200 Vac

24 VOLTS 48 VOLTS 59 VOLTS

MODEL MH400

480 / 400 Vac

MODEL MH500

590 / 480 Vac

13 DC BRAKE TIME

This parameter determines the length of time that the DC braking voltage is applied
to the motor. DC BRAKE TIME should be set to the lowest value that provides
satisfactory operation in order to minimize motor heating.

NOTE: If this parameter is set to 999.9 seconds (the maximum value), the DC
braking will be continuous. If it is set to .0 seconds, it is disabled.

14 DYNAMIC BRAKE

This parameter enables the dynamic braking circuit. Set this parameter to ON only
if the optional dynamic braking circuit board and resistors are installed.

49

Dynamic braking is used in applications where high-inertia loads need to be

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

decelerated quickly. When this is attempted, the motor regenerates voltage back
into the drive, causing the DC bus voltage to rise, eventually resulting in a HI
VOLTS fault. With the dynamic braking option, the DC bus voltage is monitored,
and when it reaches a certain level, a transistor is switched on that connects an
external resistor bank across the DC bus. This allows the regenerated energy from
the motor to be dissipated through the resistors as heat, which keeps the DC bus
voltage below the trip level.

16 CURRENT LIMIT

This parameter sets the maximum allowable output current of the drive, which also
determines the torque capability of the motor. For most applications, CURRENT
LIMIT is left at the maximum setting, which is 120% of the drive’s output current
rating. Regardless of the CURRENT LIMIT setting, the drive is capable of
delivering a maximum of 120% current for one minute before tripping into an
OVERLOAD fault. See Parameter 17 – MOTOR OVRLOAD below.

The drive will enter current limit when the load demands more current than the
drive can deliver, which results in a loss of synchronization between the drive
and the motor. To correct this condition, the drive will enter FREQUENCY
FOLDBACK, which commands the drive to decelerate in order to reduce the
output current and regain synchronization with the motor. When the overcurrent
condition passes, the drive will return to normal operation and accelerate back
to the speed setpoint. However, if FREQUENCY FOLDBACK cannot correct
the condition and the drive remains in current limit for too long, it will trip on an
OVERLOAD fault. If the drive enters current limit while accelerating, the time
required to reach the speed setpoint will be longer than the time programmed into
ACCEL RATE (Parameter 8).

17 MOTOR OVRLOAD

The MCH Series is UL approved for solid state motor overload protection.
Therefore, a separate thermal overload relay is not required for single motor
applications. The MOTOR OVERLOAD circuit is used to protect the motor from
overheating due to excessive current draw.

The trip time for the MOTOR OVERLOAD setting is based on what is known as
an “inverse I2t” function. This function allows the drive to deliver 120% of the
rated output current for one minute, and even higher current levels for shorter
periods of time. Once the overload circuit “times out”, the drive will trip into an
OVERLOAD fault.

50

The MOTOR OVERLOAD should be set to a value which is equal to the ratio (in

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

percentage) of the motor full load current rating to the drive output current rating.
This will result in an overload capacity of 120% of the MOTOR current rating for
one minute. If this parameter is set to 100%, the motor will be allowed to draw
120% of the DRIVE output current rating for one minute. This distinction is
important in cases where the motor full load current rating is significantly less than
the drive output current rating, such as applications where the drive is oversized
to meet torque requirements.

Example 1: A 5 Hp, 480 Vac drive is operating a 3 HP motor with a full load current
rating of 4.8 amps. Divide the motor current rating by the drive output current
rating: 4.8 / 7.6 = 63%. Entering this value will allow continuous operation at

4.8 amps, and will also allow the motor to draw 5.8 amps (120% of 4.8 amps) for
one minute. If the setting is left at 100%, the motor could draw 9.1 amps (120%
of 7.6 amps) for one minute before faulting.

The MCH Series drive has two options for thermal overload protection. One
depends on the speed of the drive, while the other does not. The diagram below
illustrates the difference between “speed compensated” and “non-compensated”
thermal overload protection.

100

80

60

40

20

MAXIMUM CONTINUOUS

OUTPUT CURRENT (%)

NON-COMPENSATED

SPEED COMPENSATED

10 20 30 40 50 60

FREQUENCY (Hz)

The “speed-compensated” thermal overload circuit offers additional protection
from high load conditions at low speeds, where motor cooling is often less effective
(e.g., motors with shaft-mounted fans). As seen on the diagram below, the drive
reduces the allowable continuous output current when operating at frequencies
less than 30 Hz.

Example 2: A 480 Vac, 20 HP drive is operating a motor at 10 Hz. From the
diagram, a drive operating at 10 Hz can deliver about 75% of its output current
rating continuously. A 480 Vac, 20 HP drive’s output current rating is 27 Amps.
Therefore, the drive would be able to operate continuously at 20 Amps. The drive
would also be able to deliver 120% of that value (24 Amps) for one minute before
tripping into an OVERLOAD fault.

51

The “speed compensated” thermal overload is the factory default and should be

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

used in applications where the motor does not normally experience high loads at
low speeds for extended periods of time.

NOTE 1: The above diagram is based on a MOTOR OVRLOAD setting of 100%.
For lower MOTOR OVRLOAD settings, reduce the % CURRENT values by the
same percentage. For example, if MOTOR OVRLOAD is set to 75%, reduce the
% CURRENT values by 25%. Therefore, the curve shifts down, but the shape
of the curve remains the same.

The “non-compensated” therma l over load circui t allo ws 100% current
continuously, and 120% current for one minute, at all speeds. In the example
above, the motor operating at 10 Hz without “speed-compensated” protection
would be allowed to operate continuously at 27 Amps, and could draw 32.4 Amps
for one minute before tripping. Without sufficient motor cooling, this can result
in motor failure due to overheating.

The “non-compensated” circuit is selected by setting Parameter 22 - TORQUE
to CONST / NO COMP. The “non-compensated” setting should only be used
in applications where the motor is properly cooled at all speeds, or the motor
manufacturer has approved the motor for full-load operation at low speeds.

NOTE 2: The operation of the motor thermal overload circuit is affected by the
setting of Parameter 34 - LOAD MULTIPLY.

18 BASE FREQ

The BASE FREQUENCY determines the V/Hz ratio by setting the frequency at
which the drive will output full voltage to the motor. For most applications the
base frequency should be set to match the motor’s rated frequency.

For example, if the drive is rated for 460 Vac output, and the BASE FREQUENCY
is set to 60 Hz, the drive will maintain a constant ratio of 7.66 V/Hz (except when
FIXED BOOST is active, see Parameter 19) from 0 Hz to 60 Hz. This range is the
region of constant torque. If the motor speed is increased past 60 Hz, the output
voltage remains constant while the frequency increases, resulting in a reduced V/Hz
ratio. This range, from 60 Hz to about 90 Hz, is the region of constant horsepower.
Above 90 Hz, horsepower begins to decrease as frequency increases. Refer to
Section 6.1 - DESCRIPTION OF AC MOTOR OPERATION.

19 FIXED BOOST

This parameter is used in applications which require high starting torque. FIXED
BOOST increases the output voltage at lower output frequencies (below 30 Hz
for 60 Hz base frequency), in order to boost the torque capability of the motor.
Refer to the diagram below. The factory default for FIXED BOOST depends on
the horsepower rating of the drive. Refer to the table below:

52

FX BOOST FACTORY DEFAULT SETTINGS

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

HP

FACTORY
DEFAULT

HP

FACTORY
DEFAULT

0.25 - 1 5.30 % 20 2.00 %

1.5 - 2 4.40 % 25 1.80 %

3 3.60 % 30 1.60 %

5 3.00 % 40 1.20 %

7.5 2.70 % 50 - 75 0.80 %

10 2.40 % 100 - 125 0.60 %

15 2.20 % 150 - 250 0.40 %

The diagram below illustrates how FIXED BOOST alters the V/Hz ratio to
increase motor torque.

The FIXED BOOST setting represents the amount of boost at 0 Hz (approximately
15% in the example below), and as the output frequency approaches 30 Hz, the
boost decreases to zero. Therefore, at 30 Hz and above, the V/Hz ratio returns
to its “normal” state.

100

90

80

70

60

FIXED BOOST

50

40

30

20

OUTPUT VOLTAGE (%)

10

CONSTANT V/Hz

10

20 30

40 50 60

OUTPUT FREQUENCY (Hz)

22 TORQUE (TORQUE CURVE SELECTION)

This parameter is used to select whether the output of the drive follows a constant
or variable V/Hz curve. The following selections are available:

CONSTANT Use for constant torque applications to optimize torque.

53

VARIABLE Use for variable torque applications to optimize energy

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

savings.

CONST / NO COMP Use for constant torque applications that require full

overload capacity at low speeds (see Parameter 17 ­MOTOR OL).

23 CARRIER FREQ

This parameter sets the carrier frequency, or switching frequency of the output
IGBT’s. Higher switching rates result in less audible noise to be emitted from the
motor, but the efficiency of the drive decreases as the carrier frequency increases.
Therefore, this parameter should be set to the lowest value which yields acceptable
sound levels. Available settings are: 2.5 kHz, 6 kHz, 8 kHz, 10 kHz, 12 kHz
and 14 kHz.

NOTE 1: The 2.5 kHz carrier frequency setting is a variable carrier. The carrier
frequency remains fixed at 1.5 kHz up to 25 Hz output frequency. Above 25 Hz,
the carrier is a fixed multiple of 60 times the drive’s output frequency. For example,
if the output frequency of the drive was set to 45 Hz, the carrier frequency would
be 2.7 kHz (45 Hz x 60 = 2700 Hz). The other settings are constant carriers that
remain fixed for the entire speed range.

NOTE 2: The ability to operate a drive at higher carrier frequencies is dependent
on the drive horsepower rating, driven load, drive enclosure, and the ambient
temperature. Operation above 8kHz requires derating the drive by multiplying
the output current rating by the following factors: 0.94 at 10 kHz, 0.89 at 12 kHz,
and 0.83 at 14 kHz.

24 AUTO SOURCE

This parameter selects the speed reference source that the drive will follow when
it is in AUTO mode. The following options are possible:

KEYPAD The  and  keys control the drive speed.

0-10 VDC The drive will follow a 0-10 VDC signal wired between TB-

5A (+) and TB-2 (-).

4-20 MA The drive will follow a 4-20 mA signal wired between TB-5B

(+) and TB-2 (-).

PRESET #1 - #4 The drive will run at a programmable preset speed. Refer to

Parameters 1-4.

54

MOP The drive speed is controlled by two contacts (one to increase

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

the speed and the other to decrease the speed). Program
TB-13A (Parameter 47) to DECREASE FREQ, and TB-13B
(Parameter 48) to INCREASE FREQ. Closing TB-13A to
TB-2 will decrease the speed, and closing TB-13B to TB-2
will increase the speed. Refer to Section 14.2.4.

SELECTED The drive speed will be determined by whatever speed

reference is selected using the TB-13 terminals. Refer to
Parameters 47, 48, and 49.

25 START METHOD

WARNING!

Automatic start of equipment may result in damage to equipment and/or
injury to personnel! Automatic start should only be used on equipment that is
inaccessible to personnel.

This parameter selects the starting method for the drive, and can be set for one
of the following:

NORMAL The drive will start when the appropriate contact closure is

made on the terminal strip (in REMOTE mode), or by pressing
the keypad START key (in LOCAL mode). To start the drive
in NORMAL mode, a start command must be issued at least
two seconds AFTER input power is applied.

POWER UP The drive will automatically start upon application of input

power. The drive MUST be in AUTO mode, and the start
command MUST be present when power is applied for this
function to operate.

AUTO 1 FLYIN G A U T O RES TA RT - L OW per f o r manc e .

Synchronization in approximately 6 seconds with current
levels up to 50% of the drive rating. This setting results in a
slow, smooth synchronization.

AUTO 2 FLYIN G AUTO RESTART - MEDIUM performance.

Synchronization in approximately 1 second with current
levels up to 50% of the drive rating. This setting allows faster
synchronization while retaining smoothness.

AUTO 3 FLYING AU T O R ES TART - H I G H p er fo r ma n ce .

Synchronization in approximately 1 second with current levels
up to 100% of the drive rating. This setting allows the fastest
synchronization, but sacrifices smoothness.

55

The AUTO 1 - 3 settings allow the drive to start into a spinning load after a fault

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

or upon application of input power. As with POWER UP, the drive MUST be
in AUTO mode, and the start command MUST be present after a fault or when
power is applied for this function to operate.

When set for AUTO 1, 2, or 3, the drive will attempt five restarts after a fault.
During the interval between restart attempts, the drive will display START
PENDING to indicate that the equipment will automatically restart. If all five
restart attempts are unsuccessful, the drive will trip into FAULT LOCKOUT,
which requires a manual reset. Every 15 minutes that passes will decrement the
restart counter by one. Therefore, 75 minutes after a successful restart, the restart
counter is fully reset, and the drive can once again attempt five restarts.

NOTE 1: When set for AUTO 1, 2, or 3, only the first two restart attempts will
perform a speed search to start into a spinning load. The last three restart attempts
will apply DC braking (at the voltage level programmed into Parameter 12 - DC
BRAKE) for 15 seconds and then start from zero speed.

NOTE 2: The drive WILL NOT restart after a CONTROL or PWR SAG
fault. Also, if an OUTPUT fault occurs below 1.5 Hz, only one restart will be
attempted, after a 30 second delay. If unsuccessful, it will then trip into FAULT
LOCKOUT, which requires a manual reset. This is done to protect the drive in
case of a shorted motor.

26 STOP METHOD

This parameter selects whether the motor will COAST to a stop, or RAMP to a
stop, when the drive is given a stop command.

COAST When a stop command is given, the drive shuts off the output

to the motor, allowing it to coast to a stop. In this mode, the
time it takes the motor to stop is governed by the inertia of
the driven load.

RAMP When a stop command is given, the drive will decelerate the

motor to a stop over a period of time according to Parameter
9 - DECEL.

28 SPEED SRC KEY (SPEED SOURCE KEY)

This parameter ENABLES or DISABLES the SPEED SOURCE key on the keypad.
The SPEED SOURCE key can be used to change the speed reference source. See
Section 13.1 - KEYPAD FUNCTIONS.

ENABLED The SPEED SOURCE key is active and can be used to select

HAND ONLY, AUTO ONLY, or NORM SRC.

56

DISABLED The SPEED SOURCE key is disabled and cannot be used to

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

select HAND ONLY, AUTO ONLY, or NORM SRC.

NOTE: If the SPEED SOURCE key is disabled, the drive will respond to the
last speed source selected before the SPEED SOURCE key was disabled. For
example, if the SPEED SOURCE key was used to select HAND ONLY, and then
the SPEED SOURCE key is disabled, the drive speed will be controlled by the
HAND SOURCE only.

29 HAND SOURCE

This parameter selects the speed reference source that the drive will follow when
it is in HAND mode. The following options are possible:

KEYPAD The  and  keys control the drive speed.

0-10 VDC The drive will follow a 0-10 VDC signal wired between TB-

5A (+) and TB-2 (-).

4-20 MA The drive will follow a 4-20 mA signal wired between TB-5B

(+) and TB-2 (-).

PRESET #1 - #4 The drive will run at a programmable preset speed. Refer to

Parameters 1-4.

MOP The drive speed is controlled by two contacts (one to increase

the speed and the other to decrease the speed). Program
TB-13A (Parameter 47) to DECREASE FREQ, and TB-13B
(Parameter 48) to INCREASE FREQ. Closing TB-13A to
TB-2 will decrease the speed, and closing TB-13B to TB-2
will increase the speed. Refer to Section 14.2.4.

SELECTED The drive speed will be determined by whatever speed

reference is selected using the TB-13 terminals. Refer to
Parameters 47, 48, and 49.

30 CONTROL

This parameter affects how the H/O/A modes are selected, and also determines
the level of serial control. The following settings are possible:

NORMAL H/O/A is selected from the keypad or terminal strip. The

serial link can be used for monitoring only; no serial
start/stop or speed control.

NORM NO HAND Same as NORMAL except HAND mode is disabled.

AUTO mode can be selected normally from the keypad
or terminal strip.

57

SERIAL SPEED H/O/A is selected from the keypad or terminal strip. The

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

serial link can control the drive speed or PID setpoint, but
only in AUTO mode. In HAND and OFF modes, serial
speed control is disabled. No serial start/stop control.

S SPD / NO HAND Same as SERIAL SPEED except HAND mode is

disabled. AUTO mode can be selected normally from
the keypad or terminal strip.

SERIAL AUTO H/O/A is selected from the keypad or terminal strip. In

AUTO mode, only the serial link can start the drive. The
serial link can control the drive speed or PID setpoint in
AUTO mode only.

S AUTO / NO HND Same as SERIAL AUTO except HAND mode is disabled.

AUTO mode can be selected normally from the keypad
or terminal strip.

31 UNITS (SPEED/PID UNITS)

This parameter sets the units of the output speed or the PID display on the keypad.
The following choices are available:

speed: HERTZ pid: CFM (cubic feet per minute)
speed: RPM (revolutions per minute) pid: GPM (gallons per minute)
speed: %HZ (percent Hertz) pid: IN (inches)
speed: /SEC (units per second) pid: FT (feet)
speed: /MIN (units per minute) pid: /SEC (units per second)
speed: /HR (units per hour) pid: /MIN (units per minute)
speed: GPH (gallons per hour) pid: /HR (units per hour)
speed: NONE (no units displayed) pid: F (degrees Fahrenheit)
pid: % (percent of PID feedback) pid: C (degrees Celsius)
pid: PSI (pounds per square inch) pid: MPM (meters per minute)
pid: FPM (feet per minute) pid: GPH (gallons per hour)

NOTE: If one of the “pid” units is selected, but the drive is in HAND (open-loop)
speed control mode or PID MODE is DISABLED, the displayed speed units will
default to HERTZ.

32 HZ MULTIPLIER

The HZ MULTIPLIER is used to scale the output speed indication on the display.
This parameter is only active when UNITS is set for speed: RPM, speed: /SEC,
speed: /MIN, speed: /HR, or speed: GPH. Multiplying the output frequency by
the HZ MULTIPLIER will yield the desired speed value on the display.

58

Example: The desired speed units is RPM with a standard 60 Hz, 1800 RPM

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

motor. Set UNITS to speed: RPM and set HZ MULTIPLIER to 30.00. This will
result in a display of 1110 RPM for an output frequency of 37 Hz (37 Hz X 30
= 1110 RPM). Also, if there is a 100:1 gear reducer in the system, Parameter 33

- UNITS DECIMAL below could be set to XX.XX to represent the output of the
gear reducer (11.10 RPM in the example).

33 UNITS DECIMAL (UNITS DECIMAL POINT)

In “non-PID” mode, UNITS DECIMAL selects the decimal point location of the
speed display. UNITS DECIMAL has no effect if UNITS is set to speed: HERTZ
or speed: % HZ.

In PID mode, UNITS DECIMAL selects the decimal point location for the PID
SETPOINT and FEEDBACK displays, and FEEDBACK @ MIN and FEEDBACK
@ MAX.

The possible settings are: XXXXX, XXX.X, XX.XX, X.XXX, and .XXXX. Refer
to the above example in Parameter 32 - HZ MULTIPLIER.

34 LOAD MULTIPLY

This parameter is used to scale the % LOAD display. If the drive output current
rating is higher than the motor full load current rating, the drive will not display
100% load when the motor is at full load. Setting this parameter to the ratio (in
%) of the drive output current rating to the motor full load current rating will scale
the load display to show motor load instead of drive load. This will result in a
display of 100% when the motor is at full load.

The motor overload circuitry is also affected by this parameter. When the display
reads 120% load, the drive will trip on OVERLOAD in one minute, regardless
of the actual motor current. If this parameter is used to scale the display to show
actual motor load, then Parameter 17 - MOTOR OL should be left at 100%.
Likewise, if MOTOR OL has been set according to the motor full load rating,
this parameter should be left at 100%. Changing both parameters will result in
an OVERLOAD fault sooner than expected.

The output signal at TB-10B is also affected by this parameter. When set to the
ratio of current ratings as explained above, the output signal will be proportional
to motor load instead of drive load.

35 LCD CONTRAST

This parameter is used to adjust the contrast of the drive display and can be set
to LOW, MED, or HIGH in order to obtain the most visible display. If the drive
is mounted lower than eye level, a HIGH setting may make the display more
visible. Likewise, if the drive is mounted higher than eye level, a LOW setting

59

may make the display more visible.

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

36 SLEEP THRSHLD (SLEEP THRESHOLD)

The MCH Series drive has a Sleep Mode function that allows the drive to cease
operation when system demand falls below a preset level. This is to prevent the
motor from operating at low speeds for long periods of time. It is commonly
used along with the PID Setpoint Control feature, but can also be used in standard
speed control mode.

When the commanded speed falls below the SLEEP THRESHOLD setting for the
defined SLEEP DELAY time (see Parameter 37 below), the drive will "go to sleep"
and the motor will go to zero speed. The drive will remain "sleeping" until it is
commanded to operate at a speed that is 2 Hz above the SLEEP THRESHOLD, at
which point it will "wake up" and ramp the motor up to the commanded speed.

NOTE 1: While the the drive is in Sleep Mode, the Status portion of the display
will read SLEEP.

NOTE 2: If the drive's commanded speed goes below the SLEEP THRESHOLD,
the SLEEP DELAY timer will start to count down. If the commanded speed equals
or exceeds the SLEEP THRESHOLD before the SLEEP DELAY times out, the
SLEEP DELAY timer will be reset.

NOTE 3: If the drive is in a Stop state, and the commanded speed is below
the SLEEP THRESHOLD, the drive will immediately go to sleep upon a Start
command, bypassing the SLEEP DELAY.

37 SLEEP DELAY

This parameter sets the amount of time the drive must operate below the SLEEP
THRESHOLD (see Parameter 36 above) before the drive "goes to sleep" and
brings the motor to zero speed.

Example: SLEEP THRESHOLD is set to 15 Hz and SLEEP DELAY is set to 60
seconds. If the drive operates below 15 Hz for 60 seconds, the drive will "go to
sleep" and the motor will stop. The drive's display will indicate SLEEP, and the
drive will remain "sleeping" until the drive is commanded to a speed equal to or
greater than 17 Hz. At this point, the drive will "wake up" and ramp the motor
up to the commanded speed. This example assumes that SLEEP BANDWIDTH
(Parameter 38) is set to 0.

38 SLEEP BANDWID (SLEEP BANDWIDTH)

This parameter allows the PID feedback signal to determine when drive should
"wake up" when operating in Sleep Mode. In process systems that utilize Integral
Gain (see Parameter 78), the drive may cycle in and out of Sleep Mode more often
than desired, due to the Integral function of the PID algorithm.

60

When SLEEP BANDWIDTH is used, the feedback signal must decrease or increase

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

(depending on whether the system is normal or reverse-acting) by the programmed
amount before the drive will "wake up". This parameter is set in PID units.

Example: In a normal-acting system, the PID setpoint is 50 PSI, SLEEP
THRESHOLD is set to 20 Hz, and SLEEP BANDWIDTH is set to 5 PSI. The
drive will enter Sleep Mode when the commanded speed drops below 20 Hz for
the time defined in SLEEP DELAY. The drive will wake up when the feedback
signal drops below 45 PSI (50 PSI setpoint minus 5 PSI bandwidth = 45 PSI),
even if the commanded speed is still below 20 Hz.

NOTE: If SLEEP BANDWIDTH is set to 0, this function is disabled, and the
drive will wake up when the commanded speed exceeds the SLEEP THRESHOLD
plus 2 Hz, as described in Parameters 36 and 37.

39 TB5 MIN FREQ

This parameter sets the output frequency of the drive that will correspond to the
minimum analog speed reference input (0 VDC or 4 mA). This parameter is used
in conjunction with Parameter 40 - TB5 MAX FREQ to define a speed range that
corresponds to the analog speed reference input (0-10 VDC or 4-20 mA).

40 TB5 MAX FREQ

This parameter sets the output frequency of the drive that will correspond to the
maximum analog speed reference input (10 VDC or 20 mA). This parameter is
used in conjunction with Parameter 39 - TB5 MIN FREQ to define a speed range
that corresponds to the analog speed reference input (0-10 VDC or 4-20 mA).

Example: The drive is required to operate from 0 to 60 Hz in response to a 0-5
VDC speed reference signal (rather than the “normal” 0-10 VDC). Because TB5
MAX FREQ is based on a 0-10 VDC (or 4-20 mA) signal, the drive will operate
at half of the TB5 MAX FREQ value if it is given a 5 VDC signal. Therefore,
setting TB5 MAX FREQ to 120 Hz will cause the drive to run at 60 Hz when it
is given a 5 VDC speed reference signal.

NOTE: The drive can be programmed for inverse operation so that as the speed
reference increases, the drive speed will decrease, and as the speed reference
decreases, the drive speed will increase. This is accomplished by setting TB5
MIN FREQ to the desired maximum output frequency, and TB5 MAX FREQ to
the desired minimum output frequency.

41 AN INPUT FLTR (ANALOG INPUT FILTER)

This parameter adjusts the filter on the analog input terminals (TB-5A and TB­5B) to reduce the effect of any electrical noise that may be present on the analog
input signals.

61

This filter works in both PID mode and standard speed control mode. It should

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

be set to the lowest value that yields acceptable performance, as setting it too high
may cause the drive to react too slowly to signal changes.

42 TB10A OUTPUT

The analog output signal at TB-10A is proportional to the output frequency of the
drive. This parameter selects whether that signal is 0-10 VDC or 2-10 VDC. The
2-10 VDC signal can be converted to a 4-20 mA signal by connecting a resistor
in series with the signal such that the total circuit resistance is 500 Ohms. If set
to NONE, the function is disabled.

NOTE: This output cannot be used with “loop-powered” devices that derive
power from a 4-20 mA signal.

43 TB10A SCALING

This parameter scales the analog output signal at TB-10A. This setting is the output
frequency that is indicated when the TB-10A output measures 10 VDC.

Example: The drive is part of a control system that requires a 0-5 VDC signal
(rather than 0-10 VDC) that is proportional to 0-60 Hz output frequency. The
output signal is linear, so setting this parameter to 120 Hz would yield 10 VDC
at 120 Hz, and 5 VDC at 60 Hz.

44 TB10B OUTPUT

The analog output signal at TB-10B is proportional to the drive load. This
parameter selects whether that signal is 0-10 VDC or 2-10 VDC. The 2-10 VDC
signal can be converted to a 4-20 mA signal by connecting a resistor in series with
the signal such that the total load resistance is 500 Ohms.

NOTE: This output cannot be used with “loop-powered” devices that derive
power from a 4-20 mA signal.

45 TB10B SCALING

This parameter scales the analog output signal at TB-10B. This setting is the load
(in %) that is indicated when the TB-10B output measures 10 VDC.

Example: The drive is part of a control system that requires a 0-10 VDC signal
to indicate 0-120% drive load. If this parameter is set to 120%, the drive will
output 10 VDC at 120% load (and about 8.3 VDC at 100% load).

NOTE: The output signal at TB-10B is affected by the setting of Parameter 34

- LOAD MULTIPLY.

62

47 TB13A INPUT

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

This parameter is used to select the function of terminal TB-13A. Closing TB­13A to TB-2 activates the TB-13A input function. The following functions can
be selected:

NONE Disables the TB-13A function.

0-10VDC Selects 0-10 VDC as the speed reference input (or setpoint

source in PID mode). The 0-10 VDC signal is wired to TB­5A (+) and TB-2 (-).

4-20 MA Selects 4-20 mA as the speed reference input (or setpoint

source in PID mode). The 4-20 mA signal is wired to TB-5B
(+) and TB-2 (-).

PRESET #1 Selects PRESET #1 (Parameter 1) as the speed reference.

DEC FREQ Decrease frequency setpoint. Used with the MOP (motor

operated pot) function. Refer to Section 14.2.6 - SPEED
REFERENCE SELECTION.

REVERSE Selects Reverse motor rotation. This function can be used

for cooling tower de-icing.

48 TB13B INPUT

This parameter is used to select the function of terminal TB-13B. Closing TB­13B to TB-2 activates the TB-13B function. The following functions can be
selected:

NONE Disables the TB-13B function.

0-10VDC Selects 0-10 VDC as the speed reference input (or setpoint

source in PID mode). The 0-10 VDC signal is wired to TB­5A (+) and TB-2 (-).

4-20 MA Selects 4-20 mA as the speed reference input (or setpoint

source in PID mode). The 4-20 mA signal is wired to TB-5B
(+) and TB-2 (-).

PRESET #2 Selects PRESET #2 (Parameter 2) as the speed reference.

INC FREQ Increase frequency setpoint. Used with MOP (motor operated

pot) function. Refer to Section 14.2.6 - SPEED REFERENCE
SELECTION.

63

49 TB13C INPUT

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

This parameter is used to select the function of terminal TB-13C. Closing TB­13C to TB-2 activates the TB-13C input function. The following functions can
be selected:

NONE Disables the TB-13C function.

0-10VDC Selects 0-10 VDC as the speed reference input (or setpoint

source in PID mode). The 0-10 VDC signal is wired to TB­5A (+) and TB-2 (-).

4-20 MA Selects 4-20 mA as the speed reference input (or setpoint

source in PID mode). The 4-20 mA signal is wired to TB-5B
(+) and TB-2 (-).

PRESET #3 Selects PRESET #3 (Parameter 3) as the speed reference.

HAND Selects HAND mode. TB-1 to TB-2 must be closed for the

drive to start when TB-13C is closed to TB-2.

REVERSE Selects Reverse motor rotation. This function can be used

for cooling tower de-icing.

NOTE: On drives equipped with the Bypass option, TB-13C is factory set to
HAND and cannot be changed.

50 TB13D INPUT

WARNING!

EXTERNAL FAULT (TB-13D) circuitry may be disabled if parameters are reset
to factory defaults! The drive must be reprogrammed after a RESET in order
to insure proper operation (see Parameter 65 - PROGRAM).

FAILURE TO DO SO MAY RESULT IN DAMAGE TO EQUIPMENT AND/
OR INJURY TO PERSONNEL!

This parameter selects the function for TB-13D. The following settings are
available:

EXTERN FAULT Sets TB-13D as a normally open EXTERNAL FAULT

contact. Close TB-13D to TB-2 to trip the drive into an
EXTERNAL FAULT.

EXTERN / FAULT Sets TB-13D as a normally closed EXTERNAL FAULT

contact. Open TB-13D to TB-2 to trip the drive into an
EXTERNAL FAULT.

64

EXTERN CLEAR Sets TB-13D as a normally open EXTERNAL FAULT

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

RESET. Close TB-13D to TB-2 to clear a fault.

NOTE: When set to EXTERN CLEAR, TB-13D becomes the only terminal
that can be used to clear a fault (TB-1 will not work). However, the keypad OFF
(STOP) key can still be used to clear faults.

52 TB14/RELAY #2

This parameter sets the open-collector output indication for terminal TB-14. The
following conditions can be selected:

NONE This setting disables the output.

RUN The relay energizes when the drive is given a START

command, and remains energized until: a STOP
comman d is given and the output freque ncy has
decelerated to 0.5 Hz, the drive has “tripped”, or the
input voltage is removed. Note that this relay indicates
only that the drive is in the RUN mode. It does not
necessarily indicate that the motor is turning.

FAULT The relay energizes when input voltage is applied to the

drive and remains energized until the drive “trips” into
a fault condition, or input voltage is removed.

INVERSE FAULT The relay energizes when the drive “trips” into a fault

condition, and remains energized until the fault condition
is cleared.

FAULT LOCKOUT This setting is used when the drive is programmed to

automatically restart after a fault. The relay energizes
when input voltage is applied to the drive and remains
energized until the drive has faulted and unsuccessfully
attempted five restarts, or input voltage is removed.

AT SPEED The relay energizes when the drive reaches the speed

setpoint. To avoid a “chattering” relay (energizing and
de-energizing), due to small fluctuations in speed, the
relay will remain energized as long as the actual speed
is within + 3 Hz of the speed setpoint.

ABOVE PRSET #3 ABOVE PRESET SPEED #3 - The relay energizes when

the output frequency exceeds the PRESET #3 value,
and de-energizes when the output frequency returns to a
value lower than the PRESET #3 value. See Parameter
3 - PRESET #3 in Section 18.0 - DESCRIPTION OF
PARAMETERS.

65

CURRENT LIMIT The relay energizes when the drive is operating in

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

current limit. Once the current limit relay is energized,
it remains energized for a minimum of 500ms, regardless
of whether the drive is still in current limit. At the end
of the 500ms interval, the relay will de-energize if the
drive is no longer in current limit. See Parameter 16

- CURRENT in Section 18.0 - DESCRIPTION OF
PARAMETERS.

AUTO/HAND SRC The relay energizes when the drive speed is controlled by

the AUTO SOURCE, and de-energizes when the drive
speed is controlled by the HAND SOURCE. Refer to
Section 14.2.4 - SPEED REFERENCE SELECTION.

FOLLOWER PRES FOLLOWER PRESENT - The relay energizes when the

analog input reference signal at TB-5B is greater than 2
mA, and de-energizes if the signal falls below 2 mA.

MIN/MAX ALARM The relay de-energizes when the feedback signal (in PID

mode) or the speed reference signal (in open-loop speed
mode) is within the limits set by MIN ALARM and MAX
ALARM (Parameters 81 and 82), and energizes when the
signal falls below the MIN ALARM setting or exceeds
the MAX ALARM setting.

INV MIN/MAX A INVERSE MIN/MAX ALARM - The relay energizes

when the feedback signal (in PID mode) or the speed
reference signal (in open-loop speed mode) is within
the limits set by MIN ALARM and MAX ALARM
(Parameters 81 and 82), and de-energizes when the
signal falls below the MIN ALARM setting or exceeds
the MAX ALARM setting.

MIN ALARM The relay de-energizes when the feedback signal (in

PID mode) or the speed reference signal (in open-loop
speed mode) equals or exceeds the MIN ALARM setting
(Parameter 81), and energizes when the signal falls below
the MIN ALARM setting.

INV MIN ALARM INVERSE MIN ALARM - The relay energizes when the

feedback signal (in PID mode) or the speed reference
signal (in open-loop speed mode) equals or exceeds the
MIN ALARM setting (Parameter 81), and de-energizes
when the signal falls below the MIN ALARM setting.

MAX ALARM The relay de-energizes when the feedback signal (in PID

mode) or the speed reference signal (in open-loop speed
mode) is less than or equal to the MAX ALARM setting
(Parameter 82), and energizes when the signal exceeds
the MAX ALARM setting.

66

INV MAX ALARM INVERSE MAX ALARM - The relay energizes when

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

the feedback signal (in PID mode) or the speed reference
signal (in open-loop speed mode) is less than or equal
to the MAX ALARM setting (Parameter 82), and de­energizes when the signal exceeds the MAX ALARM
setting.

RUN REVERSE Energizes when the drive is running in reverse rotation,

and de-energizes when running in forward rotation.

The open-collector output circuit is a current-sinking type rated at 30 VDC and 40
mA maximum. A power supply (30 VDC max.) must be used to power the open­collector outputs. The standard drive does not have a power supply (a 24 VDC
power supply is optional when the drive is equipped with the Bypass option).

NOTE: On models above 30 HP @ 240 Vac and 60 HP @ 480 Vac & 590 Vac,
this parameter also controls a second FORM C relay at TB-19, 20, and 21.

53 TB15/RELAY #3

This parameter sets the open-collector output indication for terminal TB-15. It
has the same functionality as Parameter 52 - TB14/RELAY #2 above.

NOTE: When the drive is equipped with the Bypass option, Parameters 52 and
53 control Relay #2 and Relay #3 respectively. When the drive is equipped with
the Option Box, Parameter 52 controls Relay #2. Refer to Appendix A and B.

54 RELAY #1

On models rated up to 30 Hp @ 240 Vac and 60 Hp @ 480 Vac & 590 Vac, there
is one FORM C relay at TB-16, 17, and 18 that can be programmed for the same
indications as the open-collector outputs described above. Larger models also have
a second relay at TB-19, 20, and 21 controlled by Parameter 52 - TB-14/RELAY#2
(this additonal relay is optional on the smaller models).

The FORM C relay contacts are rated 2 Amps at 28 VDC or 120 Vac. Control
wiring diagrams show relays in the rest state (coils NOT energized).

55 TB5B LOSS (LOSS OF FOLLOWER ACTION)

This parameter selects the action taken by the drive if the 4-20 mA follower signal
is lost at TB-5B. The 4-20 mA signal is considered lost if it falls below 2 mA.

FAULT The drive will trip into a FLWR/SER fault condition.

PRESET #3 The drive will operate at PRESET #3 (Parameter 3).

67

56 SERIAL LOSS (LOSS OF SERIAL LINK ACTION)

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

This parameter selects the action taken by the drive if the serial link is lost. The
serial link is considered lost if there is no serial activity for 10 seconds.

FAULT The drive will trip into a FLWR/SER fault condition.

AUTO The drive will operate according to the speed reference defined

by Parameter 24 - AUTO SOURCE.

57 SERIAL COMM

This parameter is used to activate serial communications. When using this
feature, the drive can communicate with a personal computer (PC), programmable
logic controller (PLC), or other external device that utilizes RS-485 serial
communications for control. The serial interface may be used to read present
parameter settings (uploading to the control device), write new parameter settings
(downloading from the control device), monitor present drive activity, and control
drive activity. The following settings are available:

DISABLED Serial communication function is disabled.

WITH TIMER Enables serial communications with a watchdog timer. If

there is no serial activity (read or write) for more than 10
seconds, the drive will either trip into a fault, or go to the
speed reference selected in Parameter 24 - AUTO SOURCE,
depending on the setting of Parameter 56 - SERIAL LOSS.

W/O TIMER Enables serial communications without a watchdog timer.

However, after 10 seconds of no serial activity, serial control
can be turned off by issuing a STOP command from any source
(keypad, terminal strip) other than the serial link.

NOTE: If a RESET command (Parameter 65 - PROGRAM) is issued through
the serial link, this parameter will not default back to DISABLED. However,
explicitly setting this parameter to DISABLED through the serial link will cut
off communication with the drive.

Modbus is the standard protocol for the MCH. Optional protocols that are available
are: BACnet, LON Works, Metasys N2, and Siemens P1. Please refer to the AC
Tech website (www.actechdrives.com) for documentation on these protocols.

58 SERIAL ADDRES

This parameter is used with the serial communications feature, and is intended
for use in a multiple drive network (RS-485). The serial link will support drives
with addresses from 1 up to 247.

68

61 PASSWORD

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

This feature limits access to the programmable parameters for added security. The
correct password must be entered in order to change the parameters.

Pressing the PROG/RUN button on the keypad will activate the PASSWORD
prompt. If the correct password is entered, the PROGRAM MODE is entered
and parameters can be changed.

If the wrong password is entered, the display will flash ERROR: INCORRECT
and then return to the PASSWORD prompt to allow another attempt at entering
the correct password.

If the ENTER key is pressed while PASSWORD reads 0000, the MONITOR
MODE will be entered (if Parameter 64 - MONITOR, is set to ON), which will
allow the parameters to be viewed (except for PASSWORD), but not changed.

NOTE 1: The factory default value is 0019.

NOTE 2: If PASSWORD is set to 0000, the function is disabled. Pressing the

PROG/RUN key will result in direct entry into the PROGRAM mode without
having to enter a password.

63 SOFTWARE VERS

This parameter displays the software code and revision number of the control
board software. This information is useful when contacting the factory for
programming or troubleshooting assistance. This is a “view-only” parameter,
and cannot be changed.

64 MONITOR MODE

This parameter is used to enable (ON) or disable (OFF) the MONITOR MODE
function. The functionality is explained below:

ON Pressing the PROG/RUN key will activate the PASSWORD

prompt. If the ENTER key is pressed while the password
value reads 0000, the MONITOR MODE is entered and
parameters can be viewed (except for PASSWORD), but not
changed.

OFF Pressing the PROG/RUN key will activate the PASSWORD

prompt. If the ENTER key is pressed while the password
value reads 0000, it will be treated as in incorrect password
and the display will flash ERROR: INCORRECT, and then
return to the PASSWORD prompt to allow another attempt
at entering the correct password.

69

65 PROGRAM (PROGRAM FACTORY DEFAULTS)

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

WARNING!

EXTERNAL FAULT (TB-13D) circuitry may be disabled if parameters are
reset to factory defaults! The drive must be reprogrammed after a RESET in
order to insure proper operation.

FAILURE TO DO SO MAY RESULT IN DAMAGE TO EQUIPMENT AND/
OR INJURY TO PERSONNEL!

This parameter is used to reset the programmable parameters back to the factory
default settings for 60 Hz or 50 Hz systems:

MAINTAIN Maintain parameter settings as they are.

RESET 60 Resets the parameters back to the factory defaults for 60 Hz

base frequency.

RESET 50 Resets the parameters back to the factory defaults for 50 Hz

base frequency.

NOTE: When a reset is performed, TB-13D will default to a normally open
EXTERNAL FAULT contact because Parameter 50 - TB13D will be reset to
EXTERN FAULT.

66 CLEAR HISTORY

This parameter is used to clear the previous faults in the FAULT HISTORY
(Parameter 99). When set to CLEAR and the ENTER key is pushed, the display
will change to MAINTAIN, and the FAULT HISTORY will display NO FAULT
for each of the eight fault histories.

70 PID MODE

This parameter activates the PID function, and selects whether the PID control
will be direct or reverse acting. Refer to Section 19.0 - MCH PID SETPOINT
CONTROL. The following options are available:

OFF Disables the PID function to allow “standard” drive operation.

NORMAL Enables the PID function for direct-acting systems. An increase

in the feedback variable will cause a decrease in motor speed.

REVERSE Enables the PID function for reverse-acting systems. An increase

in the feedback variable will cause an increase in motor speed.

70

NOTE: The REVERSE selection is not used to compensate for reverse acting

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

feedback devices. If a reverse acting feedback device is used, program Parameters
75 and 76 - FEEDBACK @ MIN and FEEDBACK @ MAX as described in
Section 19.1 - FEEDBACK DEVICES.

When PID is enabled, and the drive is in AUTO mode, the drive will operate in a
CLOSED LOOP fashion, responding to the feedback signal in order to maintain
the process setpoint. In this case, the PID setpoint reference is controlled by the
source defined by AUTO SOURCE (Parameter 24). The SPEED REFERENCE
SOURCE indication in the CONTROL display will indicate AKB (keypad), VDC
(0-10 VDC), or IDC (4-20 mA), depending on the setpoint reference source.

When PID is enabled, and the drive is in HAND mode, the drive will operate in
an OPEN LOOP fashion, responding directly to speed commands from the keypad
or Preset #3, depending on the setting of HAND SOURCE (Parameter 29). In
this configuration, the other settings in HAND SOURCE are disabled, and speed
control will default to the keypad.

When PID is disabled, the drive will operate in an OPEN LOOP fashion,
responding directly to speed commands from the selected speed reference source
(HAND SOURCE or AUTO SOURCE).

74 PID FEEDBACK

This parameter selects the terminal to be used for the feedback signal, and can
be set to TB-5A or TB-5B. TB-5A is used for 0-10 VDC signals, and TB-5B is
used for 4-20 mA signals.

NOTE: The MCH has only one analog input of each type, so the same type of
signal cannot be used for feedback and setpoint reference. For example, a 4-20
mA signal from a transducer could not be used as a feedback signal if the setpoint
is being controlled by a 4-20 mA signal from a PLC.

75 FEEDBACK @ MIN

This parameter should be set to the value of the process variable that corresponds
to the minimum transducer feedback signal (0 VDC or 4 mA).

76 FEEDBACK @ MAX

This parameter should be set to the value of the process variable that corresponds
to the maximum transducer feedback signal (10 VDC or 20 mA).

Example: A 0-100 psi transducer outputs 4 mA at 0 psi and 20 mA at 100 psi.
Set FEEDBACK @ MIN to 0.0 PSI, and set FEEDBACK @ MAX to 100.0 PSI
(this assumes that Parameter 31 - UNITS is set to pid: PSI, and Parameter 33

- UNITS DECIMAL is set to XXX.X).

71

NOTE: If a reverse-acting feedback device is being used, FEEDBACK @ MIN

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

should be set to the maximum process variable value, and FEEDBACK @ MAX
should be set to the minimum process variable value.

77 PROPOR. GAIN (PROPORTIONAL GAIN)

The Proportional Gain setting represents the speed command output (in % of
maximum speed) that results from each 1% of error (1% of Parameter 75 ­FEEDBACK @ MIN or 76 - FEEDBACK @ MAX, whichever is larger).

Example: If PROPOR. GAIN is programmed for 5%, and the error (difference
between setpoint and feedback) is 10%, the speed command output of the
Proportional term is 50% (10 x 5 = 50) of maximum speed.

78 INTEGRAL GAIN

The Integral Gain setting represents the ramp rate of the speed command output
(in % of maximum speed per second) that results from each 1% of error.

Example: If INTEGRAL GAIN is programmed for 0.5 seconds, and the error is
5%, the rate of rise of the speed command output from the Integral term is 2.5%
(0.5 x 5 = 2.5) of maximum speed per second.

79 DIFF. GAIN (DIFFERENTIAL GAIN)

The Differential Gain setting represents the speed command output (in % of
maximum speed) that results from each 1% per second change in the error.

Example: If DIFF. GAIN is programmed for 5 seconds, and the error is increasing
at 2% per second, the speed command output of the Differential term is 10% (5
x 2 = 10) of maximum speed.

NOTE: Differential gain is used as a “shock-absorber” to dampen overshoots in
fast-acting systems. However, it can be very sensitive to “noise” on the feedback
signal and to digitizing errors, so it must be used with caution.

80 PID ACCEL (PID ACCEL/DECEL)

This parameter sets the acceleration and deceleration rate of the setpoint reference
into the PID unit. When the setpoint changes, this function will “filter” the input
to the PID unit by ramping the setpoint reference from the previous value to the
new value. This will help prevent overshoots that can occur when the PID control
attempts to respond to step changes in setpoint, resulting in smoother operation.
If PID ACCEL is set to 0.0 seconds, it is effectively disabled.

72

81 MIN ALARM

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

This parameter setting represents the value that the feedback signal (in PID mode),
or speed reference signal (in open-loop speed mode), must fall below to activate
the MIN ALARM output (see Parameters 52 - 54).

82 MAX ALARM

This parameter setting represents the value that the feedback signal (in PID mode),
or speed reference signal (in open-loop speed mode) must exceed to activate the
MIN ALARM output (see Parameters 52 - 54).

NOTE 1: The MIN ALARM function can be used to start and stop the drive
based on the level of the speed reference signal or PID feedback signal. This
is done by wiring a 2-wire start/stop circuit through the drive's Form C relay or
open-collector output, and setting the Form C relay or open-collector output for
MIN ALARM (see Parameters 52 - 54). When the signal drops below the MIN
ALARM setting, the relay or open-collector output will de-energize, which opens
the start contact and stops the drive. When the signal is equal to or greater than
the MIN ALARM setting, the relay or open-collector output will energize, which
closes the start contact and starts the drive. The drive must be in AUTO mode to
use the MIN ALARM function to start and stop and the drive.

NOTE 2: In order to use the MIN and MAX ALARM functions in non-PID
mode, PID FEEDBACK (Parameter 74) must still be programmed to match the
speed reference signal.

98 LANGUAGE (LANGUAGE SELECTION)

The MC Series drive can support other languages with the addition of an optional
LANGUAGE EEPROM chip installed in socket U11 on the control board of the
drive. If the EEPROM is not present, the default language will be ENGLISH.
Also, this parameter is not affected when the parameters are reset using Parameter
65 - PROGRAM. Therefore, if a language other than ENGLISH is selected, it
will remain in effect after a RESET.

73

99 FAULT HISTORY

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The FAULT HISTORY stores the previous eight fault conditions that caused
the drive to trip. The information stored here is view-only, it cannot be altered.
The FAULT HISTORY can be used to determine if there is a pattern, or trend,
to the faults, which may indicate a problem in the system. Refer to Section 20.0

- TROUBLESHOOTING for more information on faults.

The FAULT HISTORY indicates the number of the fault (number 1 is the most
recent fault), the fault message, and the status of the drive at the time of the fault.
An example is shown below:

99 FAULT HISTORY
3 OVERLOAD RUN

FAULT

ENTRY

FAULT

MESSAGE

DRIVE

STATUS

In the example above, the third fault entry is being viewed, which is an
OVERLOAD fault that occurred while the drive was in a RUN state.

74

19.0 MCH PID SETPOINT CONTROL

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PID Setpoint Control allows the MCH drive to maintain a process setpoint, such
as PSI or CFM, without using an external controller. When PID is activated (and
the drive is in AUTO mode), the MCH will operate in a closed-loop fashion,
automatically adjusting the motor speed to maintain the setpoint.

PID setpoint control requires feedback from the process in order to compare the
process variable “value” to the setpoint. The difference between the process
variable “value” and the setpoint is called the error. The MCH will increase
or decrease the motor speed in an attempt to minimize the error. By constantly
adjusting the motor speed, the PID control will drive the process toward the
setpoint. Refer to the PID block diagram below:

P

SETPOINT

Error

I

Speed

D

Command

Process Variable

Feedback (transducer)

Motor

Process

19.1 FEEDBACK DEVICES

A transducer or transmitter is required to monitor the process variable and provide
feedback to the PID unit in order to compare the process variable feedback to
the setpoint. A transducer outputs a signal corresponding to a fixed range of the
process variable. A transmitter provides offset and gain adjustments to allow
the output signal to be adjusted to correspond to different ranges of the process
variable. Typical output signals for transducers and transmitters are: 0-5 VDC,
0-10 VDC, or 4-20 mA. The feedback device must be externally powered, as
the drive does not have a power supply for such devices. Program Parameter 74

- PID FEEDBACK for the appropriate terminal (TB-5A or TB-5B), and connect
the feedback device as described below:

POT The positive signal wire (wiper) is connected to TB-5A, and

the “high” lead is connected to TB-6.
0-5, 0-10 VDC Connect the positive signal wire to TB-5A.
4-20 mA Connect the positive signal wire to TB-5B.

The common, or negative signal wire, is connected to TB-2 (circuit common).

75

Feedback devices can be direct or reverse acting. A direct acting device outputs

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

a signal that increases as the process variable increases. A reverse acting device
outputs a signal that decreases as the process variable increases. The programming
of Parameters 75 - FEEDBACK @ MIN and 76 - FEEDBACK @ MAX depend
on the type of feedback device being used.

When using a direct acting transducer, Parameter 75 - FEEDBACK @ MIN should
be set to the value of the process variable feedback corresponding to the minimum
feedback signal (0 VDC or 4 mA), and Parameter 76 - FEEDBACK @ MAX
should be set to the value of the process variable feedback corresponding to the
maximum feedback signal (5 or 10 VDC, or 20 mA). See the example below:

Example 1: A 0-100 psi transducer outputs a 4 mA signal at 0 psi and 20 mA at
100 psi. Program Parameter 75 to 0.0 PSI, and Parameter 76 to 100.0 PSI (this
assumes that Parameter 31 - UNITS is set to pid: PSI, and Parameter 33 - UNITS
DECIMAL is set to XXX.X).

For a reverse acting transducer, set Parameter 75 - FEEDBACK @ MIN to the
maximum process variable feedback value, and set Parameter 76 - FEEDBACK @
MAX to the minimum process variable feedback value. In other words, Parameter
75 is set higher than Parameter 76. See the example below:

Example 2: A 0-100 psi transducer outputs a 20 mA signal at 0 psi and 4 mA at
100 psi. Program Parameter 75 to 100.0 PSI, and Parameter 76 to 0.0 PSI (This
assumes that Parameter 31 - UNITS is set to pid: PSI, and Parameter 33 - UNITS
DECIMAL is set to XXX.X).

19.2 THE SYSTEM - DIRECT AND REVERSE ACTING

The entire system can also be direct or reverse acting. In a direct acting system,
an increase in motor speed causes an increase in the process variable. This is
equivalent to requiring an increase in motor speed in response to a decreasing
process variable feedback.

In a reverse acting system, an increase in motor speed causes a decrease in the
process variable. This is equivalent to requiring an increase in motor speed in
response to an increasing process variable feedback. Examples of direct and
reverse acting systems are described in the next section.

19.3 PID CONTROL - DIRECT AND REVERSE ACTING

The PID Setpoint Control software can be direct or reverse acting, and must be
set to match the system. This is accomplished with Parameter 70 - PID MODE.
When set to NORMAL (for direct acting systems), the PID unit will command an
increase in motor speed if the process variable feedback decreases, and a decrease
in motor speed if the process variable feedback increases. When set to REVERSE
(for reverse acting systems), the opposite is true.

76

NOTE: Do not use the REVERSE setting for Parameter 70 - PID MODE to

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

compensate for reverse acting feedback devices. If a reverse acting feedback device
is used, program Parameters 75 and 76 as described above in Section 19.1.

An example of a direct acting system is one that maintains duct pressure. Duct
pressure is the process variable that is monitored by the feedback device. As duct
pressure rises, motor speed needs to be decreased to maintain the pressure. A
direct acting PID control will command a decrease in motor speed in response to
an increasing process variable feedback.

An example of a reverse acting system is one that maintains water temperature
in a cooling tower. Water temperature is the process variable that is monitored
by the feedback device. As the water temperature rises, motor speed needs to
be increased to lower the temperature of the water. A reverse acting PID control
will command an increase in motor speed in response to an increasing process
variable feedback.

19.4 SETPOINT REFERENCE SOURCES

The setpoint reference input can be one of the following:

1. Keypad ( and  keys)

2. 4-20 mA signal at TB-5B

3. 0-10 VDC signal at TB-5A

4. Potentiometer signal at TB-5A

5. PRESET #1, #2, and #4 (Parameters 1, 2, and 4)

Parameter 24 - AUTO SOURCE selects the PID setpoint reference. If more than one
setpoint reference is required, then AUTO SOURCE must be set to SELECTED,
and the TB-13 terminals must be used to select the desired reference.

NOTE: The default setting of AUTO SOURCE is 4-20 MA, so AUTO SOURCE
must be changed if the setpoint reference is anything other than a 4-20 mA
signal.

Remote setpoint reference inputs at TB-5A and TB-5B can only be used if that
terminal is NOT being used for the process feedback signal from a transducer. The
MCH has only one analog input of each type, so the same type of signal cannot
be used for transducer feedback and setpoint reference. For example, a 4-20 mA
signal from a transducer could not be used as a feedback signal if the setpoint is
being controlled by a 4-20 mA signal from a PLC.

If the keypad is the setpoint reference source, the  and  keys are used to adjust
the setpoint. This is done while the drive is in the "normal" operation display.
See the example below:

Example PID setpoint of 35.0 PSI

42.53 HZ 35.0 PSI
57 % LOAD AUTO

77

To change the PID setpoint, simply

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

press the  and  keys (example
setting changed to 40.5 PSI)

48.31 HZ 40.5 PSI
64 % LOAD AUTO

CURSOR

19.5 TUNING THE PID CONTROL

Once the PID control is set up correctly, it needs to be tuned in order to maintain
the process setpoint. First, set the Integral and Differential Gains to zero, and
increase the Proportional Gain (Parameter 77) until the system becomes unstable,
then lower the gain until the system stabilizes again. Set the Proportional Gain
about 15% less than that value that stabilizes the system. If only Proportional Gain
is used, and the system is operating in a steady-state condition (setpoint is fixed
and process variable has settled to a fixed value), there will always be a certain
amount of error in the system. This is called the steady-state error.

Integral Gain (Parameter 78) is used to force the steady-state error to zero by
increasing the output speed command with respect to time. Over time, the error
will be forced to zero because the Integral term will continue to change the speed
command, even after the Proportional term reaches steady state and no longer
affects the speed command. The Integral Gain affects the rate of rise of the output
speed command from the Integral term. Small amounts of Integral Gain can cause
large changes in PID performance, so care must be taken when adjusting Integral
Gain. Too much Integral Gain will result in overshoots, especially if large step
changes in error occur.

Typically, Proportional and Integral Gain are all that is needed to fine-tune the
system. However, it may be necessary to use Differential Gain (Parameter 79) to
further stabilize the system, especially when quick responses are required. The
Differential term responds to the rate of change of the error, not the actual error
itself. Differential Gain acts like a “shock-absorber” to dampen overshoots that
can occur when the PID tries to react quickly to changes in error or setpoint.
This allows fast PID response, with reduced risk of becoming unstable due to
overshoots. The Differential term is very sensitive to electrical noise on the
feedback signal and to digitizing errors, so it must be used with caution.

The other parameter setting that affects the response of the PID control is Parameter
80 - PID ACCEL. This sets the acceleration (and deceleration) rate of the setpoint
reference into the PID unit. When the setpoint changes, this function will “filter”
the input to the PID unit by ramping the setpoint reference from the previous value
to the new value. This will help prevent overshoots that can occur when the PID
control attempts to respond to step changes in setpoint, resulting in smoother
operation. If PID ACCEL is set to 0.0 seconds, it is effectively disabled.

78

19.6 MCH DISPLAY IN PID MODE

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

When the drive is in PID mode, the DRIVE STATUS portion of the display will
indicate actual output frequency (in Hertz) instead of RUN, and the bottom left part
of the display will indicate % LOAD, VAC, or PID FEEDBACK. The ENTER
key is used to toggle between the different displays. Examples of the possible
displays are shown below:

DRIVE

STATUS

PID

SETPOINT

PID

UNITS

42.53 HZ 35.0 PSI
57 % LOAD AUTO

LOAD

METER

DRIVE

STATUS

HAND/OFF/AUTO

PID

SETPOINT

STATUS

PID

UNITS

42.53 HZ 35.0 PSI
341 VAC AUTO

MOTOR

VOLTAGE

DRIVE

STATUS

HAND/OFF/AUTO

STATUS

PID

SETPOINT

PID

UNITS

42.53 HZ 35.0 PSI

33.7 PSI AUTO

PID

FEEDBACK

HAND/OFF/AUTO

STATUS

In the examples above, the drive is running at 42.53 Hz to maintain the PID
SETPOINT of 35.0 psi. The load is 57%. Pressing the ENTER key displays motor
voltage, which is 341 Vac. Pressing ENTER again displays the PID FEEDBACK
from the process, which is 33.7 psi.

When the PID FEEDBACK display is selected, the display will flash FEEDBACK
before displaying the value to indicate what is being displayed.

79

20.0 TROUBLESHOOTING

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The table below lists the fault conditions that will cause the drive to shut down,
as well as some possible causes. Please contact the factory for more information
on troubleshooting faults.

NOTE: The drive will not automatically restart after a PWR SAG or a CONTROL
fault. Also, if an OUTPUT fault occurs below 1.5 Hz, the drive will only attempt
one restart, after a four minute delay. If unsuccessful, it will then trip into FAULT
LOCKOUT, which will require a manual reset. This is done to protect the drive
in case of a shorted motor.

FAULT MESSAGES

FAULT DESCRIPTION POSSIBLE CAUSES

OUTPUT Output transistor fault: Output Phase to ground short.

current exceeded 200% of drive Phase to phase short.

rating. FX BOOST set too high.

Bad transistor module (IPM).

LO VOLTS Low DC Bus Voltage fault: DC

bus voltage below 60% of

normal.

HI VOLTS High DC Bus Voltage fault: DC

bus voltage above 120% of Overhauling load.

normal. DECEL rate is set too fast.

HI TEMP Temperature fault: Internal

drive temperature too high. Fan failure (if equipped).

OVERLOAD Current Overload fault: Output Drive undersized for the

current rating exceeded for too application.

long. Problem with motor and/or driven

PWR TRAN Power Transient fault: Low

line voltage.

Low line voltage.

High line voltage.

Ambient temperature too high.

equipment.

AC line dipped or sagged.

80

FAULT MESSAGES

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

FAULT DESCRIPTION POSSIBLE CAUSES

PWR SAG Power Sag fault: Control board Erratic AC line.

voltage is below tolerance.

A new control board has been

installed that is different from

the previous version. This will update the software

LANGUAGE Language fault: Selected Defective language EEPROM.

language not present Language EEPROM (U11)

EXTERNAL External fault: TB-13D is open Check setting of Parameter 50.

or closed to TB-2, depending on

setting of Parameter 50 - TB13D. TB13D and TB-2.

DB ERROR Dynamic Brake fault: DB circuit The DB duty cycle is too high,

has sensed a resistor overload. causing the resistors to overheat.

CONTROL Control Board fault: New Perform a factory reset using

software has been installed Parameter 65-PROGRAM.

that is different from the

previous version. and allow the fault to be reset.

INTERNAL Internal fault: The micro- Electrical noise on control wiring.

INTERN (#) processor has sensed a problem. Defective microprocessor.

FLWR / SER

Blank Display or The power supply has shut down. Check heatsink fans (if equipped).

repeatedly flashes

TESTING or failed heatsink fans. are not clogged, contact the AC

Loss of Follower / Loss of Serial Parameter 55 - TB5B LOSS is

fault: 4-20 mA signal at TB-5B is set to FAULT.

below 2 mA, or if serial control, Parameter 56 - SERIAL LOSS is

serial link was lost. set to FAULT.

This can be the result of clogged Clear any obstructions. If they

Perform a factory reset using

Parameter 65-PROGRAM.

and allow the fault to be reset.

removed after programming.

Check devices wired between

This will update the software

Tech Service Department.

81

APPENDIX A - MCH WITH BYPASS OPTION

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

A.1 MCH OPERATION WITH BYPASS

The MCH Series drive is available with a Bypass option that allows the motor to
be operated at full speed from line power while the drive is being serviced. The
Bypass option contains three contactors. Two are used to isolate the drive while
in bypass mode. One isolates the drive from input power, and the other isolates
the drive output from the motor. The third contactor is used to start the motor
across line power.

The bypass option contains three selector switches, which are explained below:

HAND/OFF/AUTO - In HAND mode, the drive or bypass will start.
In AUTO mode, the drive or bypass will start when terminal B3 is closed to B4 on
TB50. Drive or Bypass mode is selected using the DRIVE MODE/OFF/BYPASS
MODE switch.

When configured with the Bypass option, the HAND (START), and AUTO
(START) keys on the drive's keypad are disabled and cannot be used to start the
drive. The OFF (STOP) key will still function to stop the drive.

If an MCH drive with bypass is running in drive mode, and is stopped using
the OFF (STOP) key on the drive's keypad instead of the OFF position on
the H/O/A selector switch, the drive cannot be started again until the HAND
(START) or AUTO (START) key on the keypad is pressed to reset the OFF
(STOP) command from the keypad.

DRIVE MODE/OFF/BYPASS MODE - In DRIVE MODE, the MCH drive
controls the motor (the MCH input and output contactors are closed).
In BYPASS MODE, the bypass contactor is used to start and stop the motor (the
MCH input and output contactors are open).

DRIVE TEST/OFF/DRIVE NORMAL - In DRIVE TEST mode, input power is
applied to the drive for testing purposes, but the output contactor remains open
to isolate the drive from the motor.
In DRIVE NORMAL mode, the input and output contactors are closed, allowing
the drive to control the motor.

NOTE 1: If any of the three selector switches is in the OFF position, the motor
cannot be operated.

NOTE 2: When the drive is equipped with the bypass option, motor rotation must
be checked in both drive mode and bypass mode. Refer to NOTE 2 in Section 12
for the procedure for checking and correcting motor rotation.

82

A.2 BYPASS WIRING

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

MCH drives with the Bypass option do not have a terminal strip in the same
location as a "standard" MCH drive. There is a customer terminal strip located
in the Bypass compartment, eliminating the need to remove the drive cover. All
customer wiring is done in the bypass compartment. These terminals are briefly
described below:

1
2

5A

5B

6

10A

10B

2

12A

13A

13B

13C

13D

RXA

TXB

2

+24V

2

B1

B2

B3

B4

B5

B6

B7

B8

B9

16

17

18

19

20

21

24

25

26

*
*

Relay #1

Relay #2

*

Relay #3

*
*

Essentially a duplicate of the MCH terminal strip.
Refer to Section 15.0 - MCH TERMINAL STRIP for a
description of the terminals.

Terminals 1, 12A, and 13C are used by the bypass and
cannot be used by the customer.

* A 24 VDC, 100 mA power supply is available as an
option. When the drive is equipped with this option, a
third Form C relay is provided (see below).

WARNING!

Do not connect 120 Vac to this section of the terminal
strip! Severe damage to the drive will result. This
section of the terminal strip is low voltage DC and
requires dry contacts.

Customer Start/Stop command between B3 and B4.

N.C. external interlocks between B1, B2, B3 (unit ships
with jumpers; remove jumpers to install interlocks).

Purge command between B1 and B5.

Remove jumper between B6 and B7 to disable bypass.

This terminal strip is at 120 Vac potential!

Contains two Form C relay outputs for status indication
(such as Run, Fault, At Speed, etc). The relays are rated
2 Amps at 120 Vac or 28 VDC.

Relay #1 is set using Parameter 54 - RELAY #1.
Relay #2 is set using Parameter 52 - TB14/RELAY #2.
Relay #3 is set using Parameter 53 - TB15/RELAY #3.

* A third relay is available as an option, and is included
with the optional 24 VDC power supply (see above).

83

A.3 BYPASS SCHEMATIC

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

Below is a general schematic showing how the bypass option works with the
MCH drive:

INPUT POWER

Optional Input
Disconnect/CB

Optional

Bypass Fuses

Bypass

Contactor

VFD Input

Fuses

VFD Input

Contactor

Optional AC
Line Reactor

MCH Series

VFD

VFD Output

Contactor

Thermal

Overload*

AC Motor

* If the thermal overload trips, wait 10 minutes

before resetting.

84

APPENDIX B - MCH WITH OPTION BOX

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

The MCH Series drive is available with an Option Box that allows the drive to
accommodate a disconnect switch, fuses, and line reactor. Like the Bypass option,
the customer terminal strip is not located in the drive itself, but rather in the option
box compartment, eliminating the need to remove the drive's cover. This simplifies
installation by having all of the control and power wiring in one location.

B.1 CUSTOMER TERMINAL STRIP

1

2

5A

5B

6

10A

10B

2

12A

13A

13B

13C

13D

14

15

2

RXA

TXB

16

17

18

19

20

21

*

Relay #1

Relay #2

A duplicate of the MCH terminal strip. Refer to Section

15.0 - MCH TERMINAL STRIP for a description of the
terminals.

* Terminal 14 and Relay #2 are both controlled by
Parameter 52 - TB14/RELAY #2. TB-14 is an open­collector output, while Relay #2 is a Form C relay.

Do not connect 120 Vac to this section of the terminal
strip! Severe damage to the drive will result. This section
of the terminal strip is low voltage DC and requires dry
contacts.

Contains two Form C relay outputs for status indication
(such as Run, Fault, At Speed, etc). The relays are rated
2 Amps at 120 Vac or 28 VDC.

Relay #1 is set using Parameter 54 - RELAY #1.

*

Relay #2 is set using Parameter 52 - TB14/RELAY #2.

WARNING!

NOTE: Unlike the Bypass option, which restricts the MCH drive to Remote

H/O/A only, MCH drives with the Option Box can be configured for Keypad
H/O/A or Remote H/O/A. Refer to Sections 13.1 and 14.2.

85

B.2 OPTION BOX SCHEMATIC

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

Below is a general schematic showing how the Option Box components are wired
to the drive.

NOTE: If the Option Box does not contain a disconnect or fuses, terminals will
be provided for the input power.

INPUT POWER

Optional Input

Disconnect/CB

Optional Input

Fuses

Optional AC

Line Reactor

MCH Series

VFD

Motor Terminals

AC Motor

86

APPENDIX C - USER SETTING RECORD

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAMETER MENU: USER SETTING RECORD

PARAM.

NUMBER

0 LINE VOLTS AUTO

1 PRESET #1 20.00 Hz

2 PRESET #2 20.00 Hz

3 PRESET #3 20.00 Hz

4 PRESET #4 20.00 Hz

5 SKIP FREQ #1 .00 Hz

6 SKIP FREQ #2 .00 Hz

7 BANDWIDTH 1.00 Hz

8 ACCEL RATE 30.0 SEC

9 DECEL RATE 30.0 SEC

10 MINIMUM FREQ .50 Hz

11 MAXIMUM FREQ 60.00 Hz

12 DC BRAKE VOLT .0 VDC

13 DC BRAKE TIME .0 SEC

14 DYNAMIC BRAKE OFF

PARAMETER

NAME

FACTORY

DEFAULT

USER

SETTING

16 CURRENT LIMIT 120 %

17 MOTOR OVRLOAD 100%

18 BASE FREQ 60.00 Hz

19 FIXED BOOST (NOTE 1)

22 TORQUE CONSTANT

23 CARRIER FREQ 2.5 kHz

24 AUTO SOURCE 4-20 mA

NOTE 1: REFER TO SECTION 18.0 - DESCRIPTION OF PARAMETERS.

87

PARAMETER MENU: USER SETTING RECORD

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAM.

NUMBER

25 START METHOD NORMAL

26 STOP METHOD COAST

28 SPEED SRC KEY ENABLED

29 HAND SOURCE KEYPAD

30 CONTROL NORMAL

31 UNITS speed: HERTZ

32 HZ MULTIPLIER 1.00

33 UNITS DECIMAL XXXXX

34 LOAD MULTIPLY 100%

35 LCD CONTRAST MED

36 SLEEP THRSHLD .00 Hz

37 SLEEP DELAY 30.0 SEC

38 SLEEP BANDWID 0 %

39 TB5 MIN FREQ .00 Hz

40 TB5 MAX FREQ 60.00 Hz

41 AN INPUT FLTR 0.02 SEC

42 TB10A OUTPUT NONE

43 TB10A SCALING 60.00 Hz

44 TB10B OUTPUT NONE

45 TB10B SCALING 125%

47 TB13A INPUT NONE

48 TB13B INPUT NONE

49 TB13C INPUT NONE

50 TB13D INPUT EXTERN FAULT

52 TB14/RELAY #2 NONE

PARAMETER

NAME

FACTORY

DEFAULT

USER

SETTING

88

PARAMETER MENU: USER SETTING RECORD

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

PARAM.

NUMBER

53 TB15/RELAY #3 NONE

54 RELAY #1 NONE

55 TB5B LOSS FAULT

56 SERIAL LOSS FAULT

57 SERIAL COMM DISABLED

58 SERIAL ADDRES 30

61 PASSWORD 0019

63 SOFTWARE VERS (N/A)

64 MONITOR MODE ON

65 PROGRAM RESET 60

66 CLEAR HISTORY MAINTAIN

70 PID MODE OFF

74 PID FEEDBACK TB-5A

75 FEEDBACK @ MIN 0.00%

76 FEEDBACK @ MAX 100.00%

77 PROPOR. GAIN 5.00%

78 INTEGRAL GAIN 0.0 SEC

79 DIFF. GAIN 0.0 SEC

80 PID ACCEL 30.0 SEC

81 MIN ALARM 0.00%

82 MAX ALARM 0.00%

98 LANGUAGE ENGLISH

99 FAULT HISTORY (N/A)

PARAMETER

NAME

FACTORY

DEFAULT

USER

SETTING

89

EC DECLARATION OF CONFORMITY

Phone: [phone] - Fax: [phone] - www.ctiautomation.net - e.mail: [e-mail]

In accordance with EN45014:1998

Applied Council Directive(s): EMC Directive 89/336/EEC, as amended: 92/31/

EEC and Low Voltage Directive 73/23/EEC, as amended: 93/68/EEC

We,

Manufacturer:

AC Technology Corporation
660 Douglas Street
Uxbridge, MA 01569 U.S.A.

declare under our sole responsibility that the products to which this Declaration relates,
are in conformity with the relevant provisions of the following standards, provided that
installations are carried out in accordance with manufacturer’s instructions.

PRODUCTS RELATED TO DECLARATION

MCH Series AC Variable Frequency Motor Drives:
MH200
MH400
MH500

RELEVANT EUROPEAN STANDARDS

EN 50081-2* Electromagnetic compatibility
– Generic emission standard – Part 2: Industrial environment
EN 50082-2* Electromagnetic compatibility
– Generic immunity standard – Part 2: Industrial environment
EN 50178:1998 Electronic equipment for use in power installations

* with suitable line filters that are properly installed.

Authorized Representative:

AC Technology Europe
4 Shackleton Way
Bowbrook
Shrewsbury, Shropshire SY3 8SW U.K.

YEAR OF CE Marking (Low Voltage Directive): 2000

Signature:

Jim Reinwald, Compliance Manager

Date: 17 June 2000