Fuji Electric FVR-E11S-7EN

5-37
H26
PTC thermistor (Mode select)
 Select this function for a motor equipped with a
PTC thermistor for overheat protection.
Setting 0: Inactive
1: Active
Connect the PTC thermistor as shown in the
figure. The protective operation is common with
the external alarm input. Therefore the
protective function operates at the "external
alarm".
Resistor
1000 Ω
PTC thermistor
Ｈ２７
Com-
para-
tor
External
alarm
DC10V
Resistor250 Ω
OV
(Operation level)
13
C1
11
H27 PTC thermistor (Level)
 The voltage input at terminal [C1] is compared
with the set voltage and, when the input voltage
at terminal [C1] is larger than the set voltage
(operation level), H26 "PTC thermistor
(Operation selection)" is activated.
Setting range: 0.00 to 5.00 V
(The setting smaller than 0.10 is handled as
0.10.)
 The alarm temperature is determined by the
PTC thermistor and the internal resistance of
the PTC thermistor changes largely at the alarm
temperature. Set the operation (voltage) level
using this change of resistance.
/PTC thermistor internal resistance
Rp2
Rp1
Alarm temperature Temperature
From the figure of H26 "PTC thermistor
(Operation selection)", the 250-ohm resistor and
the PTC thermistor (resistance Rp) configure a
parallel circuit. Therefore voltage VC1 (operation
level) of terminal [C1] is calculated in the
following equation.
Vc
1
=
250 Rp
250 + Rp
1000 +
250 Rp
250 + Rp
X V
・
・
１０ ［ ］
The operation level can be set when RP of the
VC1 calculation equation is in the following
range.
RP1 < RP < RP2
To determine RP simply, calculate the following
equation.
Rp =
Rp
1
+ Rp
2
２
［Ω］
H28 Droop operation
◆ To drive one machine with two or more motors,
a larger load is exerted on the motor with a
larger speed. The droop control attributes
drooping characteristics to the speed during
load fluctuation to balance the load.
◆ The drooping amount is calculated in the
following formula.
Drooping amount Base frequency
X
Drooping content of speed at rated torque r
Synchronized speed r
Hz
=
[ / min]
[ / min]
[ ]
Setting range: - 9.9 Hz to 0.0 Hz
Rated torque
０
Synchronized
speed
Speed
Torque
Droop operation Droop operation inactive
Motor characteristics
H30 Serial link (Function select)
 RS485 (standard accessory) can be connected
as a link function (communication function).
 As a link function, the following items are
possible.
1) Monitoring (monitoring of various data,
confirmation of function code data)
2) Frequency setting
3) Operation command (FWD, REV and
other commands set for digital input)
4) Function code data writing
Setting range: 0 to 3
2
10