LinMot C1200, Installation Manual, Page: 18 / 31

Installation Guide C1200
Page 18 of 31 NTI AG / LinMot
9 Safet y Wiring
The C1250 drives with the -1S option have internal safety functions:
Two Safety relays Ksr in series, which support the supply voltage for the motor drivers. There are also two
feedback contacts for each relay.
To enable the -1S drives both relays have to be switched on.
Minimal wiring:

Connect X33.8 and X33.4 to 24VDC (from safety)

Connect X33.7 and X33.3 to GND (from safety)
Never connect X33.8 and X33.4 to the logic supply of X4!
The overvoltage protection must be provided externally and sized according the safety circuit
of the machine!
The drop out time of the relays is depending on the external circuitry!
Safety Relay Ksr
Nominal voltage 24 VDC
Min. pick-up voltage at 20°C
≤ 16.8V
Drop-out voltage at 20°C
≥ 2.4 V
Drop-out time (no protection circuit) Typ. 3ms
Coil resistance at 20°C 2'100
Ω ± 10%
Type EN 50205, type A
Contact lifetime > 10'000'000
Manufacturer and type Elesta relays / SIS112 24VDC
Drive Classification according EN ISO 13849-1 (safety of machinery) (preliminary)
Category cat = 3
Performance Level PL = d
Diagnostic Coverage DC = high (99%)
Mean Time to hazardous failure of one channel
MTTF
d
= high (100 years typically, see calculation example
below)