Electrical installation
60
External power supply for the JCU Control Unit (X1)
External +24 V (minimum 1.6 A) power supply for the JCU Control Unit can be
connected to terminal block X1. Using an external supply is recommended if
• the application requires fast start after connecting the drive to the main supply
• fieldbus communication is required when the input power supply is disconnected.
Thermistor input (X4:8…9)
Motor temperature can be measured using PTC or KTY84 sensors connected to the
thermistor input.
WARNING! As the thermistor input on the JCU Control Unit is not insulated
according to IEC 60664, the connection of the motor temperature sensor requires
double or reinforced insulation between motor live parts and the sensor. If the
assembly does not fulfil the requirement,
• the I/O board terminals must be protected against contact and must not be
connected to other equipment
or
• the temperature sensor must be isolated from the I/O terminals.
Motor
T
Motor
T
TT
One PTC or KTY84 sensor Three PTC sensors
TH
AGND
10 nF
TH
AGND
10 nF
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