bonitron M3345, Reference Manual

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M3345
22
(where the switch opens at 140°F and closes at 110°F). If the unit is
cool, the switch may be defective. Contact Bonitron for service.
•
Check the ribbon cable connector CN1 to be securely plugged in.
•
If thermostat measures OK, check the continuity of the wires feeding
the 3 phase AC to the control board at TB1. The brown, yellow, and
orange wires should be directly connected to the main input fuses.
•
Verify the Dip Threshold as shown in Section 4.4.2.
5.3.3.
S
TATUS
C
ONTACT REMAINS OPEN AFTER A
5
SECOND DELAY
•
Check AC input voltage at fuses to be /- 10% of nominal
voltage
•
If unit appears to be hot allow a few minutes to cool off
•
If status contact does not change try cycling power to the unit
5.3.4.
M
ETER SHOWING EXCESSIVE CURRENT WHEN IN STANDBY
( >3%
RATED CURRENT
)
•
Measure AC input voltage to be balanced Line to Line
•
If more than 5VAC difference, move highest pair to B & C
•
Check for harmonics and noise on the AC that may be caused by DC
drives, welders, induction heaters, etc.
•
See Section 4.4 about adjustments and/or contact support at Bonitron
5.3.5.
D
RIVE TRIPS ON
DC B
US
O
VERVOLTAGE
•
Verify status contact, if open see Section 5.3.3
•
Check DC bus voltage at fuses
•
Check DC bus polarity at fuse
•
Check DC bus fuses
•
Ensure unit is not overheated
•
Verify proper sizing of regen unit
5.3.6.
OVERLOAD
LIGHT IS FLICKERING
The normal state for the
OVERLOAD
LED is OFF. The
OVERLOAD
LED
may flash for a brief moment on power-up. The
OVERLOAD
LED indicates
that the system DC bus feedback is substantially greater than the DC bus
reference signal. Under normal operating conditions, this occurs when the
regenerated power from the drive is greater than the capacity of the regen
module. When this occurs, the DC bus rise will cause the regen module to
be temporarily disabled. With the module disabled, the drive DC bus will
continue to rise until the Drive Overvoltage condition causes the drive to trip
OFF. Once the Overvoltage condition ceases to exist, the
OVERLOAD
LED will turn OFF and the fault condition will be reset.
Since the drive and regen module have peak rectifier diode modules, a
substantial line transient on the AC power lines can cause an erroneous
OVERLOAD
fault even in the standby mode.
5.3.7.
CURRENT LIMIT
LIGHT IS ON
The normal state for the
CURRENT LIMIT
LED is OFF. An ON state for the
CURRENT LIMIT
LED indicates that there is greater than 100% of the
maximum limit of instantaneous, non-filtered, regenerated current in any 1
of the 3 AC input line feeds. The response of the
CURRENT LIMIT
LED is
much quicker than the averaging DC bus ammeter frequently supplied with