Short Circuit Protection; Ground Fault Protection - Siemens 3RB22 Operating Instructions Manual

Short-circuit
protection
Thermistor
protection
Ground-fault
protection
3ZX1012-0RB22-1AA1
Main circuit (current measurement module):
refer to catalog
Control circuit:
Fuse links utilization category
Thermistor sensor in the motor is connected to terminals T1/T2
Summated cold resistance R
Measuring circuit load
Sensor circuit voltage
Open circuit voltage
Operating value overload
Release value
Short-circuit detection
The following data refers to sinusoidal fault currents of 50/60 Hz:
With a motor current between the 0.3- and 2-fold set currentI
unit trips at an ground-fault current that is 30 % of the set current.
With a motor current between the 2- and 8-fold set currentI
trips at an ground-fault current that is 15 % of the motor current.
The on-delay is 0.5 to 1 s.
Also refer to
diagram VII
current, I = operating current in the event of a ground fault).
trip_GF
≤ 1.5 kΩ
cold
≤ 5 mW
(at R
≤ 2 V
(at R
< 30 V
3.4 to 3.8 kΩ
1.5 to 1.65 kΩ
10 to 20 Ω
in the graphic section (I
Technical Data
gL/gG 6 A
= 1.5 kΩ)
cold
= 1.5 kΩ)
cold
, the
e
, the unit
e
= ground-fault
GF
23