Hoist Over-Weight Function; Hoist Over-Weight Parameters - Hitachi WJ200 Instruction Manual

HOIST OVER-WEIGHT FUNCTION

The VFD is setup to use the output current to the motor as the over-weight function. The VFD uses (2) over-weight current
parameters. Over-weight (1) is when operating less than or equal to the low-speed frequency and over-weight (2) is when operating
above low-speed frequency. The VFD automatically switches between over-weight (1) and over-weight (2) based on the frequency.
Having (2) over-weights greatly increases over-weight accuracy and decreases the likelihood of a false over-weight condition.
The VFD has (3) configurations for the over-weight signal, external momentary, external maintained, Internal.
External momentary - will output a signal when the condition is met but will not maintain the output after the condition is no longer
met. This configuration also uses digital output 12 assigned to 52:Reverse DIR with a N.C contact status which is used to latch a relay.
External maintained - will output a signal when the condition is met and maintain the signal until the reset condition is met or power is
cycled.
Internal - does not require any external circuits to function. Internal works the same way as the external maintained but will internally
prevent the hoist up function until the reset condition is met or power is cycled.
HOW IT WORKS – When the output current to the motor exceeds the value in the conditional over-weight current parameter for an
amount of time that exceeds the detection delay time, the conditional digital output will turn on and activate a 24v relay to interrupt
the hoist E-Stop circuit. The signal is turn off once the hoist has lowered for 2.0 seconds.

HOIST OVER-WEIGHT PARAMETERS

Function
Over-Weight Signal Output Type
Over-Weight Detection Delay Time
Over-Weight Reset Time
Standard Over-Weight (1) Value *Low Speed
Standard Over-Weight (2) Value *High Speed
Digital Output 11 Function
Digital Output 11 Status
Digital Output 12 Function
Digital Output 12 Status
Digital Output 12 On Delay
Parameters
P122
P123
P124
Standard Over-Weight
C041
C111
C021
C031
C022
C032
C132
Example Value
0 = External Momentary
1 = External Maintained
2 = Internal
180 = (1.80 seconds)
200 = (2.0 seconds)
14.0 Amps
15.0 Amps
44:MO1
00: N.O
52:Reverse Dir
01: N.C
2.0 s
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