Braking Resistor With Over-Heat Protection And Gtr7 Monitoring (Water-Cooled Inverters) - KEB COMBIVERT F5 Series Instruction Manual

Connection Power Unit
2.7.5.2 Braking resistor with over-heat protection and GTR7 monitoring (water-cooled invert-
ers)
This circuit offers a direct protection with defective GTR7 (braking transistor). At defective
braking transistor an integrated relay opens the terminals K1/K2 and error „E.Pu" is released.
Terminals K1/K2 are integrated into the holding circuit of the input contactor, so the input volt-
age is switched off in error case. Regenerative operation is also secured by the internal fault
disconnection. All other errors of the braking resistor and the input choke are intercepted via
a digital input. The input must be programmed to "external error".
If the PTC/KTY evaluation of the motor at terminals T1/T2 is not used, these
terminals can be used instead of the programmable input. The temperature input
must be operated in PTC mode.
Braking resistor with over-heat protection and GTR7 monitoring
L1
L2
L3
F
1
K3
2
DR1
HF1
L1 L2
PE
PB
OH1
OH2
K3 Line contactor with auxiliary contacts
S1 Key for switch on
S2 Emergency stop circuit braker for switch off DR1 Mains choke with temperature switch (optional)
H1 Tripping control
G1 Inverter with GTR7 evaluation (relay 30 V DC/ 1 A) and programmable input I1
GB - 30
3 5 11
4 6
12
OH1
OH2
L3 K1 K2
G1
T1 T2
+PA U
R1
R2
+24V
S2
G1
GTR7-Error
GND
I1
V W
R1 Braking resistor with temperature switch
R2 PTC or KTY84 sensor e.g. of the motor
HF1 HF filter
R1
OH1 OH2
K1
I1
0V
K2
12
K3
S1
11
K3 H1
DR1
OH OH