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Functions (continued)

Altivar

variable speed drives

Underload detection

This function stops the motor when it is underloaded. The function is active in

steady state.

Ifthecurrentisbelowanunderloadthresholdforanadjustableperiodoftime,

the drive locks in underload fault mode.

Thecurrentthresholdisadjustablebetween20%and100%ofthenominalmotor

current value.

Hysteresisof10%isappliedtothisthresholdtoconrmtheendofunderload

conditions.Thetimedelayisadjustableupto100s.Whenthisparameterisat0,

the function is deactivated.

This function is particularly suitable for protecting pumps during cavitation.

Overload detection

This function stops the motor when it is overloaded. The function is active in steady

state.

Ifthemotorcurrentishigherthananoverloadthresholdforanadjustableperiodof

time, the drive locks in overload fault mode.

The overload threshold can be set to between 70% and 150% of the nominal motor

current.

Hysteresisof10%isappliedtothisthresholdtoconrmtheendofoverload

conditions.

The time delay can be set at anything up to 100 s. When this parameter is at 0,

the function is deactivated.

Fault acknowledgment

This is used to clear the stored fault and restart the drive if the cause of the fault has

disappeared.

The fault is cleared by a transition of the logic input LI which is assigned to this

function.

Factory-setconguration:Functioninactive.

The restart conditions after a reset are the same as those of a normal power-up.

The following faults can be reset (1): drive thermal overload, motor thermal overload,

line overvoltage, overvoltage on deceleration, overspeed, input phase loss (2), etc.

Parameter protection by condential code

Thisfunctionprotectsthedrivecongurationusinganaccesscode.

Conguration of logic output LO+

Logic output LO+ enables remote signalling of the following information as required:

v Malfunction

v Operation

v Frequency threshold attained

v High speed attained

v Current threshold attained

v Frequency reference attained

v Motor thermal state attained

v 4-20 mA monitoring

v Underload detected

v Overload detected

v Operation of the auxiliary pump with the “Control in single variable mode with

auxiliary pump” function

Conguration of analog output AO1

Analog output AO1 enables remote signalling of the following information as

required:

v Motor current

v Motor frequency

v Ramp output

v PID error

v PID feedback

v PID reference

v Output power

v Motor thermal state

v Drive thermal state

(1) See the complete list of faults in the Altivar

12 Programming Manual, available on our

website at “www.schneider-electric.us”.

(2) The “input phase loss” fault is only accessible on drives with a three-phase power supply,

if monitoring of the fault has been enabled (factory-set conguration: enabled).

Introduction:

page 8

Specications:

page 10

References:

page 14

Dimensions:

page 18

Connections:

page 22

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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