Siemens CM300/3 User Manual download pdf (Page 24)

English 4. Clear Text Display Module & System Parameters

05.02.01

Parameter Function Range

[Default]

Description / Notes

P065

Current threshold for relay (A) 0 - 99.9

[1.0]

This parameter is used when P061 = 9. The relay switches on when

the motor current is greater than the value of P065 and switches off

when the current falls to 90% of the value of P065 (hysteresis).

P071 •

••

•

Slip compensation (%) 0 - 200

[0]

The inverter can estimate the amount of slip in an

asynchronous motor at varying loads and increase its

output frequency to compensate. This parameter `fine

tunes' the compensation for different motors in the range

0 - 200% of the inverter's nominal estimate.

P072 •

••

•

Slip limit (%) 0 - 500

[250]

This limits the slip of the motor to prevent `pull-out'

(stalling), which can occur if slip is allowed to increase

indefinitely. When the slip limit is reached, the inverter

reduces the frequency until the level of slip is acceptable.

P073 •

••

•

DC injection braking (%) 0 - 250

[0]

This stops the motor by applying a DC current. This causes heat to be

generated in the motor rather than the inverter and holds the shaft

stationary until the end of the braking period. Braking is effective for

the period of time set by P003.

The DC brake can be activated using DIN1 - DIN3 (braking is active

for as long as the DIN is high - see P051 - P053).

WARNING: Frequent use of long periods of dc injection

braking can cause the motor to overheat.

If DC injection braking is enabled via a digital

input then DC current is applied for as long as the

digital input is high. This causes heat in the

motor.

P074 •

••

•

t motor derating 0 - 1

[1]

0 = Disabled

1 = Enabled. Causes an F074 trip if the motor I

t calculation reaches its

limit. The time taken to trip is dependent on the difference between

the overload current and the nominal motor current rating stored in

P083 - typically a 150% overload will result in a switch-off in 1-2

minutes.

WARNING: For safety-critical applications, it is recommended

that a motor PTC is used to protect the motor from

overheating.

P077

Control mode 0 - 2

[0]

Controls the relationship between the speed of the motor and the

voltage supplied by the inverter.

0 = Linear voltage/frequency.

Use this curve for synchronous motors or motors connected

in parallel.

1 = Linear voltage/frequency with energy saving.

Output voltage is reduced at low load (not recommended for

dynamic loads).

2 = Quadratic voltage/frequency relationship.

This is suitable for centrifugal pumps and fans.

(P084)

(P081)

0/1

max

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 39 40

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Siemens CM300/3 User Manual Page 24

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