AC Tech MC3000 Operation Manual

MCH Series

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Installation and Operation Manual

1.0 GENERAL

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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

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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

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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

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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)

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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

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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

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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

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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)

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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

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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

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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

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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

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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

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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

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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%

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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