3-20 Installing the Drive 590 Series DC Digital Drive
Control Connections continued
Thermistor
Connect the
motor
thermistor to
terminals C1
and C2.
or
link terminals
if sensors are
not fitted
The motor temperature alarm (THERMISTOR) cannot be
inhibited in software. Terminals C1 and C2 must be linked if
sensors are not fitted.
We recommend that you protect the dc motor against
overtemperature by the use of temperature sensitive resistors or
switches in the field and interpole windings of the machine.
If the motor is fitted with over-temperature sensing devices such
as thermostats, microtherms or PTC thermistors, these should be
connected (in series) between terminals C1 and C2. Thermistors
must have a combined working resistance of 200 Ohms or less,
rising to 2000 Ohms at over-temperature. These thermistors are
classified by IEC34-II as Mark A.
Such protection devices must be double insulated from the
live windings of the machine.
Temperature sensitive resistors have a low resistance (typically
100 Ohms) up to a reference temperature (typically 125°C),
above this the resistance rises rapidly to greater than 2000 Ohms.
The controller’s thermistor alarm will activate at 1800 Ohms.
Temperature switches are usually normally closed, and open at
approximately 105°C. The thermistor alarm is latched in software
and must be reset by re-starting the Converter.
C1 C2 F1
G4
THERMISTOR
C2
C1
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