IMO VXSM75-1 Instruction Manual page 65

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".
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.
(voltage) level using
resistance.
From the figure of H26 "PTC thermistor
(Operation selection)", the 250-ohm resistor and
the PTC thermistor (resistance Rp) configure a
parallel circuit. Therefore
5-36
Set the operation
this change of
voltage VC1
(operation level) of terminal [C1] is calculated in
the following equation.
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.
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.
Setting range: - 9.9 Hz to 0.0 Hz
H30
Serial link (Function select)
•
RS485 (standard
connected as a link function (communication
function).
•
As a link function, the following items are
possible.
accessory) can be
Selecting Functions