Hoist Over-Weight Function; Hoist Over-Weight Parameters - Hitachi P1 Basic 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 an alternative over-weight current parameter source that can be configured. This is normally used in applications where
the hoist over-weight needs to be limited to a lower value in certain parts of a building or runway. The alternative over-weight uses (2)
over-weight current parameters in the same configuration as the standard over-weight function. To use the alternative over-weight,
configure the parameters in the chart below and modify the over-weight circuit to switch the source of the signal to the 24v DPDT
relay between digital output 11 and digital output 14.
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.
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.
NOTE
– Internal is only latched to the STANDARD OVER-WEIGHT function.
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
Alternative Over-Weight (1) Value *Low Speed
Alternative Over-Weight (2) Value *High Speed
Digital Output 14 Function
Digital Output 14 Status
Parameters
UE-54
UE-55
UE-56
Standard Over-Weight
CE106
CE107
CC-01
CC-11
Alternative Over-Weight
CE102
CE103
CC-04
CC-14
Page 15
Example Value
0 = External Momentary
1 = External Maintained
2 = Internal
150 = (1.5 seconds)
200 = (2.0 seconds)
14.0 Amps
15.0 Amps
69:MO1
00: N.O
10.0 Amps
11.0 Amps
73:MO5
00: N.O