V1.5 ©2009 JetAir Technologies, LLC
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Blower Does Not Start
Top Line of HIM Displays “FAULT <NN>”
(continued)
1) Impeller does not freely rotate:
• Volute is misaligned and contacting
impeller – loosen V-Band Clamp on
volute, adjust volute, then re-tighten V-
Band Clamp
• Motor bearing has failed: Impeller
rotates with difficulty – rough sound
2) Designed blower flow is exceeded
• Blower is running without restrictions on
the outlet – i.e., there is no plumbing
attached to the outlet
• Electrical Supply Problems.
• Check for leakage in piping.
• Reduce Air Knife Gap
• Increase Butterfly Valve Closure.
• Reduce Blower Speed.
• Remove some Air Components from
system.
<24> Decel Inhibit: This is due to an
artificially low factory set value. Change
the ‘decel inhibit’ bit (7th from the right)
in parameter ‘Fault Config 1’ (parameter
#238) from a value of 1 to 0.
<36> SW Overcurrent: The drive is
drawing amps in excess of the nameplate
full load amps (parm #42), but less than
the Current Limit Value (parm# 148) of
the drive. Check with JetAir on NP
settings.
<38,39,40> U, V, W Phase to Ground:
Motor Phase is Shorted to ground –
indicating a damaged motor. Check for
NO continuity between motor phases
(U,V,W) and ground (motor frame).
<41,42,43> U, V, W Phase-Phase Short:
• Check for Shorts in Cable, Connections,
and between Motor Phases:
• Disconnect power cable from AC DRIVE
at the motor and see if Fault still occurs –
if so there is a short in the cable -
• Check for Wire Conductors for shorts
• Check Resistance between Phases with
Ohm Meter – should read .25 to .60 Ohms
Blower Does Not Start
Top Line of HIM Displays “Conflict
<Parameter Name>”
Example: Conflict ‘Max Speed’ usually
occurs when maximum speed setting is
set below preset speed.
• Set Parameter 82 = 310
• Set Parameter 101 = Application Setting
(Normally 265-300Hz)
Blower Begins to Start, but Hz do not
change but Amps increase slightly.
• Check Motor to AC DRIVE wiring -
indicative of 2-phase wiring on 3 phase
system. This means that one power input
is missing or loose connection. Check for
tight connections on power leads to motor
on motor and drive sides.
