Vogt TUBE-ICE P-118F, Service Manual

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P118F Service Manual
OPTIONS AND ACCESSORIES
1/6/09
10-4
Trouble Shooting
Motor Does Not Start Controller ramp not selected or 2 ramps
selected Check for connections between Ramp 1
and Common or Ramps 2 and Common
on the controller. Only one ramp should
be selected for starting
Power supply or motor not connected to
controller Verify that proper 3 phase power is
present.
Verify that the compressor is connected to
the controller. Make sure any series
disconnect switches or isolating
contactors are closed
Motor starts but does not come up to
speed. Controller not finished ramping up to line
voltage. Check to see that the unit has finished
ramping up the motor voltage.
If motor is coming up to speed too slowly,
decrease start time adjustment.
Make sure that the Decel input is not
selected (connection between Decel and
Common on the controller). This will
cause permanent reduced voltage to be
applied to the motor.
PFC Voltage adjusted too low. Increase PFC adjustment and set per
instructions as described in this
publication.
Motor growls when started but eventually
comes up to speed. Controller initial torque set too low. Raise initial torque setting until load just
begins to turn when power is first applied
Shorted SCR. Disconnect power and check for shorted
SCR as described below. Replace power
pole containing shorted SCR as required.
Motor growls when started and does not
come up to speed. Controller not finished ramping voltage Check to see that the unit has finished
ramping the motor voltage.
If motor is coming up to speed to slowly,
decrease start time adjustment.
Make sure that Decel is not selected
(connection between Decel and Common
on controller). This will cause a
permanent reduced voltage to be applied
to the motor.
Shorted SCR Disconnect power and check for shorted
SCR as described below. Replace power
pole containing shorted SCR as required.
Motor comes up to speed to quickly /
slowly Setting improperly adjusted Readjust according to the set up
instructions.
Load too light to soft-start
Load too heavy
Motor does not start soft; it starts hard Controller not set for soft start. Review set-up procedure and set for
desired soft start.
Shorted SCRs. Disconnect power and check for shorted
SCR as described below. Replace power
pole containing shorted SCR as required.
Motor overload device trips during
starting / running. Motor not receiving full voltage Check for line voltage limiting set too
low.
PFC set too low Check for PFC set too low and adjust as
indicated.
How to check for a shorted SCR:
1. Disconnect and lock out all power to unit.
2. Measure the resistance from line to load (L1 to T1), across each phase of the controller.
3. Any reading of less the 3,000 ohms indicates a shorted SCR that must be replaced. Readings can be as high as 3,000,000 ohms.