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| 4. | Clear Text Display Module & System Parameters | ||||||||
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Parameter | Function | Range | Description / Notes |
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P065 | Current threshold for relay (A) | 0 - 99.9 | This parameter is used when P061 = 9. The relay switches on when | ||||||||
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| [1.0] | the motor current is greater than the value of P065 and switches off | ||||||||
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| when the current falls to 90% of the value of P065 (hysteresis). |
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P071 • | Slip compensation (%) | 0 - 200 | The inverter can estimate the amount of slip in an | ||||||||
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| [0] | asynchronous motor at varying loads and increase its | ||||||||
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| output frequency to compensate. This parameter `fine | ||||||||
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| tunes' the compensation for different motors in the range | ||||||||
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| 0 - 200% of the inverter's nominal estimate. |
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P072 • | Slip limit (%) | 0 - 500 | This limits the slip of the motor to prevent | ||||||||
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| [250] | (stalling), which can occur if slip is allowed to increase | ||||||||
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| indefinitely. When the slip limit is reached, the inverter | ||||||||
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| reduces the frequency until the level of slip is acceptable. |
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P073 • | DC injection braking (%) | 0 - 250 | This stops the motor by applying a DC current. This causes heat to be | ||||||||
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| [0] | generated in the motor rather than the inverter and holds the shaft | ||||||||
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| stationary until the end of the braking period. Braking is effective for | ||||||||
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| the period of time set by P003. |
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| The DC brake can be activated using DIN1 - DIN3 (braking is active | ||||||||
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| for as long as the DIN is high - see P051 - P053). |
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| WARNING: | Frequent use of long periods of dc injection | |||||||
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| braking can cause the motor to overheat. | ||||||
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| If DC injection braking is enabled via a digital | ||||||
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| input then DC current is applied for as long as the | ||||||
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| digital input is high. This causes heat in the | ||||||
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| motor. |
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P074 • | I2t motor derating | 0 - 1 | 0 = | Disabled |
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| [1] | 1 = | Enabled. Causes an F074 trip if the motor I2t calculation reaches its | |||||||
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| limit. The time taken to trip is dependent on the difference between | |||||||
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| the overload current and the nominal motor current rating stored in | |||||||
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| P083 - typically a 150% overload will result in a | |||||||
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| minutes. |
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| WARNING: | For | |||||||
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| that a motor PTC is used to protect the motor from | ||||||
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| overheating. |
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P077 | Control mode | 0 - 2 | Controls the relationship between the speed of the motor and the | ||||||||
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| [0] | voltage supplied by the inverter. |
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| 0 = Linear voltage/frequency. |
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| Use this curve for synchronous motors or motors connected | |||||||
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| in parallel. |
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| 1 = Linear voltage/frequency with energy saving. |
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| Output voltage is reduced at low load (not recommended for | |||||||
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| dynamic loads). |
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| 2 = Quadratic voltage/frequency relationship. |
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| This is suitable for centrifugal pumps and fans. |
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| Vmax |
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| VN (P084) | 0/1 |
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| fN (P081) | f | ||||
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© STÖBER plc 1998
05.02.01 | 22 |
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