FujiFilm FRENIC5000G11S Series, Technical Information

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2-40
Chapter 2
3. Function Explanation
■
H27 PTC thermistor (Level)
The voltage input to terminal C1 is compared to the set
voltage (operation level). When the input voltage is equal to
or greater than the operation level, “H26 PTC thermistor
(Mode select),” starts.
- Setting range: 0.00 to 5.00V
The PTC thermistor has its own alarm temperature. The
internal resistance value of the thermistor largely change at
the alarm temperature. The operation (voltage) level is set
using this change in the resistance value.
Internal resistance of PTC thermistor
The figure in “H26 PTC thermistor (Mode select),” shows that
resistor 250
Ω
and the thermistor (resistance value Rp) are
connected in parallel. Hence, voltage V
C1
(operation level) at
terminal C1 can be calculated by using the following formula.
250·Rp
Vc1=
250 + Rp
x 10 [V]
1000 + 250·Rp
250 + Rp
The operation level can be set by bringing Rp in the Vc1
calculation formula into the following range.
Rp1 < Rp < Rp2
To obtain Rp easily, use the following formula.
Rp = Rp1 + Rp2 [
Ω
]
2
■
H28 Droop control
When two or more motors drive a single machine, a higher
load is placed on the motor rotating the fastest. Droop control
achieves a good load balance by applying drooping character-
istics to speed against load variations.
Calculate the droop amount using the following formula:
Droop amount =
Base frequency x Speed droop at rated torque [r/min] [Hz]
Synchronous speed[r/min]
- Set value : -9.9Hz to 0.0Hz
Rp1
Rp2
Temperature
Alarm temperature
H28 DROOP
Speed
When droop control is active
Rated torque
0
When droop control
is inactive
Torque
Synchronous
speed
■
H30 Serial link (Function select)
The link function (communication function) provides RS-485
(provided as standard) and various bus connections (optional).
The link function includes:
1) Monitoring (data monitoring, function data check)
2) Frequency setting
3) Operation command (FWD, REV, and other commands for
digital input)
4) Writing function data
- Setting range: 0 to 3
Communication can be enabled and disabled by a digital
input. This function sets the link function when communication
is enabled.
The data monitoring and function data write functions are
always enabled. Disabling communication using digital input
brings about the same result as when 0 is set to this function.
When the bus option is installed, this setting selects the
function of the option and the RS-485 interface is restricted to
monitoring and writing function data. When the option is not
installed, this setting selects the RS-485 function.
■
H31 RS-485 (Address)
to
■
H39 RS-485 (Response interval )
These functions set the conditions of RS-485 communication.
Set the conditions according to the upstream device. Refer to
4. Communication Specification (RS-485) for the protocol.
■
H31 RS-485 (Address)
This function sets the station address of RS-485.
- Setting range: 1 to 31
Characteristics of the motor
H30 LINK FUNC
Set value Frequency setting Operation command
0 Inactive Inactive
1 Active Inactive
2 Inactive Active
3 Active Active
H31 485ADDRESS
H27 PTC LEVEL
Chapter02J(P26˜43).p65
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