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VS-616G5 Programming Manual 119

This parameter assists in protecting the IGBT from overheating of the transistor junction when the out-

put current is high and the output frequency is low. The settings are as follows:

This parameter allows the selection of normal or fast OL2 protection below 6 or 10 Hz. It is recom-

mended that this parameter be enabled at all times. In some instances fast OL2 protection (L8-19=1)

may not be desired, such as when operating in flux vector at zero speed. If L8-19 is set to 0 (disabled)

L8-17 must be set to 1,2, or 3.

Caution: When disabling OL2 protection, (L8-19=0) verify that the motor current will not go beyond

the current limit level when operating below 10 Hz. Or set the carrier frequency equal to or

less than 2 kHz.

L8-17 IGBT Protection at Low Speed Prtct@L-Spd

A A A —

Setting Description

0 Conventional Method (No change in carrier), inverter relies on L8-19 protection (same as 1042

software).

1 Lower fc - When output current is greater than 100%, and output frequency is less than or equal to

10Hz, the carrier frequency is automatically decreased to the L8-18 setting (between 8 and 2 kHz

depending on model). The carrier will automatically return to the normal value after the load is

reduced. (factory default)

2 Short term OL2 - OL occurs in 2 seconds when at low output frequencies (6Hz or less) and in hard

current limit.

3 I-Limit=150% - Current limit is 150% of inverter rated current. The IGBT junction temperature

should be below any critical level provided the output current is less than 150%. <1110>

L8-19 OL2 Characteristics at Low speed <1110> OL2 Chara@L-Spd

A A A A

Setting Description

0 Disabled -OL2 protection is disabled at low speed. This OL2

protection is the same at high speed and low speed. (factory

default).

1 Enabled - A current limiting function is performed at low

speed, the inverter OL2 protection responds quickly at 6 Hz or

less.

Section L: Protection Parameters

L8 Hardware Protection

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 161 162

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