GB - 34
Connection Power Unit
2.7.5.1 Braking resistor without temperature monitoring
Intrinsically safe braking resistor without temperature monitoring
+PA
PB
RB
G1
Only "intrinsically safe" braking resistors are permissible for operation without tem-
perature monitoring.
2.7.5.2 Braking resistor with over-heat protection and GTR7 monitoring
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 termi-
nals can be used instead of the programmable input. The temperature input must
be operated in PTC mode.
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