NORD Drivesystems BU0300 User Manual
Page 24
NORDAC trio SK 300E Manual
24
Subject to technical alterations
BU 0300 EN
2.6.2 Important information for single phase operation (1~230V)
1. Mains supply is implemented via terminals L1 (L) and L2 (N) for 0.37-0.75kW SK 300E, or L3 (L) and L2
(N) for 1.1kW SK 300E.
This is important for the correct function of the brake rectifier, amongst others.
2. Higher input currents occur with single phase operation. (Chap. 9.2)
3. The mains voltage monitoring must be switched off (Parameter P538 = 0).
2.6.3 Motor temperature protection
The only reliable motor over-temperature protection is a
temperature sensor installed inside the motor winding
(PTC resistor, PTC) This can be connected to a digital
input and evaluated. A Klixon (bimetal switch) is also
possible.
Normally, the motor of a trio SK 300E is equipped with a
PTC resistor. In the basic frequency inverter configuration
(without customer unit), 1 digital input is available. This
should normally be used as the PTC input and is set up
as the factory setting.
Switching on can take place directly with the supply voltage (P428 "Automatic start up" 2 = immediate with
mains), via a bus connection, with the ParameterBox, the potentiometer option or with the NORD CON
operating software. If additional control signals are required, then the device must be upgraded with a
customer unit (Basic I/O - SK CU2-BSC, Standard I/O - SK CU2-STD).
If a different digital input is used for the PTC when a customer unit is added, then the relevant parameter
P420...P424 of the digital input must be set to the set value 13.
2.6.4 Electromechanical motor brake
An output voltage is generated by the frequency inverter at the terminals -Br/+Br to actuate an
electromechanical motor brake (see Chap. 2.6.1 Assignments for the adapter unit). This is dependent on the
supply voltage present in the frequency inverter. The allocation is as follows:
Mains voltage / AC voltage
Brake coil voltage (DC)
400V ~
180V =
460V ~ - 480V ~
205V =
230V ~
105V =
The allocation of the correct brake or brake coil voltage must be taken into account in the design with
reference to the frequency inverter mains voltage.
Motor
PTC
+5V supply voltage
Terminal: “VO +5V”
Dig. input
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