Condair Nortec GS 50, Operation And Maintenance Manual

Page: 79 / 92

79 Fault Isolation Nortec GS
2583701_C_EN_1812_Nortec-GS_OM
Code
Message Probable Cause Corrective Action(s)
Warning Fault
– E146 Blower Not Operating The identified blower is not operating, or registered a value below 500 rpm
while being energized. The unit is unsafe to operate with this fault condi -
tion. Fix the problem before restarting the unit.
Loose connections.
– Check the PWM (pulse width
modulation) and power connec -
tion to the blower.
Blower relay on driver board may be
defective.
CAUTION! Electro-static discharge
damage to board.
– Visually check that LED7 (cor -
responding to relay REL8 for the
blower) on the driver board lights
up when the blower is supposed
to be energized. If LED7 does
not light up, the relay is faulty.
– Replace the driver board. Refer
to the GS Spare Parts List.
Blower feedback signal may be
missing.
– Restart the unit, and check the
blower rpm in Input Diagnostics in
the control software. If the rpm
is low, contact your Condair
representative.
Restrictions at blower, or damaged
blower.
– Visually inspect the blower and
blower inlet for restrictions.
– Visually inspect the blower
impeller for damage. Order a re -
placement blower, if necessary.
Main power to blower relay damaged. – Visually inspect the connections
between the main power.
– Visually inspect the blower
relay for damage and replace if
necessary.
Worn out blower. – The blower speed may decrease
due to wear. The blower is safe
to operate, but the output may
be reduced. Order a replace -
ment blower.
W147 – Blower rpm Low The blower identified is running at a lower rpm than expected by more than
the allowable tolerance. The unit will continue monitoring the blower rpm
and display this warning if the rpm remains low.
Loose connections.
– Check the PWM and power con -
nection to the blower.
Low voltage. – Visually check that LED7 (cor -
responding to relay REL8 for the
blower) on the driver board lights
up when the blower is supposed
to be energized.
– Check for 120 VAC on the out -
put side of the blower relay.
Restrictions at blower, or damaged
blower.
– Visually inspect the blower and
blower inlet for restrictions.
Worn out blower. – The blower speed may decrease
due to wear. The blower is safe
to operate, but the output may
be reduced. Order a replace -
ment blower.
W148 – Blower rpm High The blower identified is running at a higher rpm than expected by more
than the allowable tolerance. The unit will continue monitoring the blower
rpm and display this warning if the rpm remains high.
Loose connection.
– Check the PWM connection to
the blower.