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L8-03 overheat pre-alarm operation selection, L8-05 input phase loss protection, L8-06 input phase loss detection level – Yaskawa iQpump Drive User Manual User Manual

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5.1 iQpump Basic Programming Parameters

YASKAWA TM.iQp.01 iQpump Drive User Manual

119

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.

L8-05 Input Phase Loss Protection

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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

L8-06 Input Phase Loss Detection Level

Setting Range:

0.0 to 25.0% of iQpump drives OV Trip point

Factory Default: 7.5%

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 5.29

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