Yaskawa iQpump Controller User Manual - Manual (Page 121)

Pump Tuning
YASKAWA TM.iQp.06 iQpump Controller User Manual 121
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L8-03 Overheat Pre-Alarm Operation Selection
The iQpump drive is capable of warning the operator of an impending heatsink over-temperature fault via an OH pre-alarm. The level at
which the pre-alarm will activate is determined by the setting of parameter L8-02. Measurement of the heatsink temperature is done with
several strategically mounted thermistors. If any of the heatsink thermistors measure a temperature in excess of the setting of L8-02, the
iQpump drive will fault (OH2) and either: ramp to stop using the C1-02 deceleration rate (L8-03 = “0: Ramp to Stop”), coast to stop
(L8-03 = “1: Coast to Stop”), ramp to stop using the C1-09 fast stop deceleration rate (L8-03 = “2: Fast-Stop”), alarm (OH) and continue
running (L8-03 = “3: Alarm Only”), alarm (OH) and continue running but at a reduced speed (L8-03 = “4: Alarm & Reduce”). If
L8-03 = 4: Alarm and Reduce, the iQpump drive will continue to run but will reduce the speed to the level determined by parameter
L8-19. Refer to the description for parameter L8-19.
If a digital output is configured for OH Prealarm (H2-01 = “20: OH PreAlarm”), it will close whenever the heatsink temperature is
greater than the L8-02 level no matter what the setting is of L8-03.
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L8-05 Input Phase Loss Protection
<0033>
The input phase loss detection circuit monitors the DC bus current ripple and activates when one of the input phases is lost. The detection
circuit calculates the maximum and minimum values of the DC bus voltage in one second intervals, and compares the difference (
ΔV)
between these values with an internal detection level. If ΔV reaches or exceeds the detection level, after 0.5 second, the input phase loss
is detected; a PF fault occurs and the motor coasts to a stop.
Input phase loss detection is disabled in the following cases:
• A Stop command is input
• Magnetic Contactor (MC) shuts OFF
• CPU A/D converter fault (CPF5)
• During deceleration
• Output current < 30 % of Inverter rated current
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L8-06 Input Phase Loss Detection Level
Setting Range: 0.0 ~ 25.0 % of iQpump drives OV Trip point
Factory Default: Drive Model Dependent
The iQpump drive checks for a lost input phase by monitoring the DC Bus voltage ripple. After an initial delay of approximately 12
seconds, the iQpump drive will sample the DC BUS voltage every 1.28 seconds to determine the minimum and maximum voltage
readings. The difference between the minimum and maximum voltage is averaged over ten consecutive scans. If this “averaged” value is
greater than the trip level as determined by L8-06 (L8-06 x 400 for 200 volt class iQpump drives; L8-06 x 800 for 400 volt class iQpump
drives) the iQpump drive shuts down and displays “PF,” an input phase loss fault.
Figure 5.30
Figure 5.48 Input Phase Loss Detection Diagram
Setting Description
0 Ramp to Stop (Decel Time C1-02)
1 Coast to Stop
2 Fast-Stop (Decel Time C1-09)
3 Alarm Only
4 OH Alarm and Reduce (factory default)
Setting Description
0 Disabled
1 Enabled (factory default)
t
L8-06
Phase Loss
Fault Signal
DC Bus
Voltage
10 seconds
Fault Contact
t
Closed
Open
Input Phase Loss
Time