Brock AX12 User manual

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 1 February 2011
AXIAL FAN
TROUBLE SHOOTING
GUIDE

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 2 February 2011
Table of Contents
Frequently Asked Questions ......................................................................................................................... 3
Axial Fan CONTROL Troubleshooting Chart .................................................................................................. 5
Axial Fan MOTOR Troubleshooting Chart ..................................................................................................... 6
Axial Fan WHEEL Troubleshooting Chart ...................................................................................................... 7
APPENDIX A.................................................................................................... Error! Bookmark not defined.

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 3 February 2011
Frequently Asked Questions
How do I change a fan motor from 230V to 460V?
oWiring from 230 to 460 or 460 to 230: The actual wiring diagram from the motor
manufacture will be needed. You will need the catalog number off the motor
(example UCLE1015). On Baldor’s web site under support you can inquire under
the catalog number and have access to wiring diagrams, performance spec’s,
etc.
How do I change a 115V single phase fan motor to a 230V single phase?
oSome 1ph fans such as the AX12 and AX14 use single phase motors that can be
wired up for either 115v or 230v. On the back of the motor there is a plate that is
removable. On that plate will be a diagram showing low and high voltage hook
up.
oBaldor’s web site can also be used for wiring connections.
How much variation can there be in line voltage for motors?
oElectric motors can operate normally at voltages that are +/- 10% of their rated
voltage. Example –a 460V motor has an operating range of 414V-506V
oHigher voltage will result in slightly lower amps.
How can I change the fan controls from 230V to 460V?
oThe control circuit operates at 115 volts so it will need a transformer or a
separate 115V line for the control circuit.
oProcess varies depending on the fan model, but typically you will need to
add/change the following components:
Contactor (not always required)
Overload switch
Auxiliary contactor
Transformer
oSee Appendix A for part numbers
How can I change the fan controls from 460V to 230V?
oProcess varies depending on the fan model, but typically you will need to change
the following components:
Contactor
Overload switch
Transformer
Wiring diagram and voltage decals
Increase wire size for new amperage load
Larger wire connectors for larger size wire
oRemember, going from 460V to 230V will double the amperage so the wire size
may need to be increased. Please consult a licensed electrician.
What can be done to change the 115V coil to a 230V coil?
oThis can be done but Brock does not carry the 230V coil. A licensed electrician
can source a replacement coil.
oNote: This problem sometimes will come up when a neutral wire is missing. A
neutral wire is required for a 115V control circuit. (you need both a neutral and
ground wire)

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 4 February 2011
How do I change the blade on an axial fan?
oRefer to page 25 of the fan operators manual MFH1707 for detailed instructions.
Can I reverse a fan motor to draw air out instead of pushing air into the bin?
oFans cannot be re-wired to operate the motor in the reverse direction.
oAxial fan housings can be installed 180° from normal to draw air out.
Are Brock’s fan motors “Inverter Ready”?
oOnly 3 phase motors can be used with Inverters or Frequency drives
oAll Baldor 3 phase motors with a catalog number beginning with the letter “M”
can be used with frequency drives. Catalog numbers are located on motor tag.
How can I find the start-up peak amperage draw for a fan motor?
oThis varies per motor but the rule-of-thumb is 6-7 times the full load amps. The
FLA is listed on the motor name plate.
What is the efficiency rating of the fan motor?
oThe motor efficiency rating is listed on the motor name plate
Why are some motors rated 10-15HP? How can it be both?
oThis is actually a 10HP motor running at the torque loads of a 15HP. This would
normally overheat the motor but since the motor is designed to be mounted in the
primary airstream of the fan, the additional heat generated is dissipated in the
airstream.
oThe same applies for a 7-10HP motor

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 5 February 2011
Axial Fan CONTROL Troubleshooting Chart
No.
Symptom
Possible Causes
Possible Solutions
1
Fan does not start
Bad start switch
Check continuity, this is a
normally closed contact
Bad stop switch
Check continuity, this is a
normally open contact
No neutral wire to #2
terminal
Install a neutral wire to
#2 terminal opposite
other white wire
Bad contactor
Replace contactor
Overload tripped
Reset by pushing blue
button on the overload
relay. If it continues to
trip check motor or other
areas for high amperage
causes
Blown fuse
Check fuses and replace
if needed
2
Fans runs for a short time then trips
overload relay
High motor amps
Check to make sure the
fan wheel is rotating
CCW when viewed from
the inlet
Tighten all wire
connections in the fan
control box or in the
motor connection box
High static pressure
caused by crusted grain,
blocked vents

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 6 February 2011
Axial Fan MOTOR Troubleshooting Chart
No.
Symptom
Possible Causes
Possible Solutions
1
Fan motor amps above rated Full Load
Amps (FLA)
(see page 19 of Fan manual MFH1707 for
amperage specifications)
Wire size not adequate
to handle motor load
Have licensed electrician
check or replace wires to
correct size
High static pressure
Bin roof vents restricted
Dirty grain
Obstructions in fan
transition and aeration
tunnels
2
Fan tripping breaker
Improper size breaker
Have licensed electrician
size and install correct
breaker
Loose wire connectors
Check all connectors and
tighten
High motor amps
See No. 1 above
3
Fan motor running too hot (note –most
steel housing motors will run so hot that
you cannot touch for more than one
second)
High motor amps
See No. 1 above

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 7 February 2011
Axial Fan WHEEL Troubleshooting Chart
No.
Symptom
Possible Causes
Possible Solutions
1
Fan vibrating
Wheel out of balance
Check for debris in fan
wheel
Check for wasp nest in
wheel
Wheel needs rebalancing
Motor shaft bent
Check shaft run-out with
dial indicator, replace if
needed
Wheel mounting hub
loose or damaged
Refer to operators
manual for specific hub
torque specifications
2
Centrifugal Fan makes loud vacuum
sound
Too large of offset
between the fan wheel
and the inlet cone
Loosen wheel bushing
and adjust the offset
according to the
instructions in the
operators manual
MFH1725 pg. 26

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 8 February 2011
APPENDIX A
ORDER THE FOLLOWING PARTS TO CONVERT
A FAN CONTROL FROM 230V TO 460V
QTY
PART NO.
DESCRIPTION
1
SEE TABLE
CONTACTOR
1
SEE TABLE
OVERLOAD RELAY
1
0-48239
TRANSFORMER, 100VA
1
2531-00100
AUX. CONTACTOR
1
0-48362-100
COVER KIT, XFORMER 100VA (2 PCS)
1
0-48363
PULLER KIT, XFORMER FUSE (3 PCS)
2
0-48330
2A FUSE
1
0-48350
460V DECAL
1
0-48353
460V WIRING DECAL
4
39-48301
10-32x3/8 THREAD FORMING SCREWS
AXIAL FAN CONVERT FROM 230V TO 460V
FAN MODEL
230V
460V
230V
CONVERT
TO
460V
CONTACTOR
SIZE
OVERLOAD
RELAY
OVERLOAD
SETTING
CONTACTOR
SIZE
OVERLOAD
RELAY
OVERLOAD
SETTING
AX18-232-WC
TO
AX18-234-WC
2531-00105
18A
2530-00064
8.2
2531-00105
18A
2530-00062
4.1
AX18-332-WC
TO
AX18-334-WC
2531-00105
18A
2530-00066
12.0
2531-00105
18A
2530-00063
6.0
AX22-432-WC
TO
AX22-434-WC
2531-00105
18A
2530-00066
12.0
2531-00105
18A
2530-00063
6.0
AX24-532-WC
TO
AX24-534-WC
2531-00102
40A
2530-00089
18.0
2531-00105
18A
2530-00064
9.0
AX24-732-WC
TO
AX24-734-WC
2531-00102
40A
2530-00068
23.0
2531-00105
18A
2530-00065
11.5
AX24-1032-WC
TO
AX24-1034-WC
2531-00102
40A
2530-00068
23.0
2531-00105
18A
2530-00065
11.5
AX26-1232-WC
TO
AX26-1234-WC
2531-00102
40A
2530-00069
33.0
2531-00105
18A
2530-00066
16.5
AX28-1532-WC
TO
AX28-1534-WC
2531-00102
40A
2530-00069
33.0
2531-00105
18A
2530-00066
16.5
Instructions for connecting the Transformer on next page

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 9 February 2011
1. Remove jumper between X2 & X3 on the transformer
2. Remove and discard the red wire from X1 to the fuse holder on the transformer
3. Install Auxiliary contact to left side of contactor (opposite side of black fuse
holder)
4. Connect black wire from L1 on contactor to HF terminal on the transformer
5. Connect black wire from L3 on contactor to H1 terminal on the transformer
6. Connect a white wire from X2 on the transformer to the #2 grey terminal block
(small terminal blocks next to the 5A fuse holder)
7. Connect a red wire from X1 on the transformer to the top side of the 5A black
fuse holder
8. Connect a red wire from the bottom terminal of the 5A fuse holder to terminal
#183 on the auxiliary contact.
9. Connect the #3 red wire from the OFF button to terminal #173 on auxiliary
contact
10. Connect the #4 wire from A2 on the contactor to terminal # 163 on the auxiliary
contact
11. Connect the #4 wire from ON button to terminal # 163 on the auxiliary contact
12. Connect wire #7 from the #7 grey terminal block to terminal #153 on the
auxiliary contact
Instructions for connecting the Transformer
A2
Auxiliary Contact
Terminal #7
Terminal #2

Models: AX12, AX14, AX16, AX18, AX22, AX24, AX26, AX28
Page 10 February 2011
Document Revision History
June 2009 Created Document
July 2009 Added detail to FAQ section How can I change the fan controls from 230V to 460V?
Added #2 on page 7
Added question - Are Brock’s fan motors “Inverter Ready”? in FAQ section
Sept 2009 Added Appendix A, added Fan Control symptoms
Sept 2010 Added solutions to the troubleshooting charts
Feb 2011 Added to Frequently asked questions