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9.0 Keypad Operating Functions

This section discusses keypad operating functions. All of the functions that can be accessed

through the keypad, are discussed. The functions are listed and discussed in the order in which

they are accessed. The item number identifier following the function is used for ease of location

in the System Parameters Adjustment Range and Factory Settings (see section 7.2).

9.1 SETUP PARAMETERS

ACCELERATION TIME #1 (ITEM 1) - Sets the time required to accelerate from OHz to

the maximum frequency (FH) set by function [:FH]. Setting this time to low can

cause undue stress and over current tripping of the drive.

DECELERATION TIME #1 (ITEM 2) - Sets the time required to decelerate from

maximum frequency (FH) to OHz. Setting this time to low can cause undue stress

and over voltage tripping of the drive.

UPPER FREQUENCY LIMIT (ITEM 3) - Sets the upper frequency limit of applications.

The inverters frequency can be increased up to this upper limit and cannot be increased

any further. The value of the maximum safe frequency (FH) must be equal to or

greater than the upper frequency limit.

LOWER FREQUENCY LIMIT (ITEM 4) - Sets the lower frequency limit of applications.

The inverters frequency can be decreased down to this lower limit and cannot be

decreased any further without stopping or resetting the lower limit.

TERMINAL IV REFERENCE POINT# 1 (ITEM 5) - Sets the percentage of the input

signal on terminal IV which is used to reference the # 1 output frequency (PI) designated

by function [F-P1]

POINT # 1 OUTPUT FREQUENCY (ITEM 6) - Sets the output frequency used for

reference point function [FP-1].

TERMINAL IV REFERENCE POINT # 2 (ITEM 7)- Sets the percentage of the input

signal on terminal IV which is used to reference the # 2 output frequency designated

by function [F-P2]

POINT # 2 OUTPUT FREQUENCY (ITEM 8) - Sets the output frequency used for

reference point [FP-2].

ELECTRONIC THERMAL PROTECTION LEVEL (ITEM 9) - Sets the thermal overload

detection level to match the ratings and characteristics of the motor being used (10 to

100% of rated output current). The inverter can run at 110% continuously and may

cause unnecessary motor overheating unless this compensation is used.

STALL PREVENTION ACTIVATION LEVEL (ITEM 10) - Sets the activation level of the

stall protection function (90 to 120% of rated output current). When the stall level is

reached the inverter begins a soft stall procedure by lowering the frequency and voltage

to prevent overcurrent tripping. Once the soft stall procedure starts the output current

will be clocked. If output current is not reduced within a specified time a fault will occur.

The soft stall function is particularly useful Is situations where load current decreases

as the revolution speed decreases (fan and pump equipment). This function is activated

through the Electronic Thermal Protection Select (:SEL4). Instantaneous trip current

limits are factory set and are dependent upon inverter size as well as the motor

ripple current.

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Toshiba Q-Flowsaver II Manuel d'utilisateur Page 42

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