Braking Resistor With Over-Heat Protection And Gtr7 Monitoring (Water-Cooled); Figure 29: Braking Resistor With Over-Heat Protection And Gtr7 Monitoring - KEB COMBIVERT F5 Instruction Manual

2.6.5.2 Braking resistor with over-heat protection and GTR7 monitoring (water-cooled)

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 that into the holding circuit of the input contactor, so the input
voltage 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".
Info
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
(see "Use of the temperature input in PTC mode").
The picture below is only an example and has to be adapted according to the application.
L1
L2
L3
F
1
K3
2
DR1
HF1
L1 L2
PE
PB
OH1
OH2
Figure 29:
K3 Line contactor with auxiliary con-
tacts
S1 Key for switch on
S2 Emergency stop circuit braker for
switch off
H1 Tripping control
G1 Inverter with GTR7 evaluation (relay 30 V DC/ 1 A) and programmable input I1
36
Terminals T1/T2 and example picture
3 5 11
4 6
12
OH
OH
L3 K1 K2
G1
T1 T2 U
+PA
R1
R2
Braking resistor with over-heat protection and GTR7 monitoring
+24V
G1
GTR7-Error
I1
GND
V W
R1 Braking resistor with temperature switch
R2 PTC or KTY84 sensor e.g. of the motor
DR1 Mains choke with temperature switch
(optional)
HF1 HF filter
R1
OH1 OH2
S2
K1
K2
K3
S1
K3 H1
DR1
OH OH
I1
0V
12
11