4 | UL-compliant use STOBER
18
12/2018 | ID 442537.05
Information
STOBER recommends the use of PTC thermistors as thermal winding protection.
Braking resistor
If the drive controller is to be provided with an externally mounted braking resistor, overheat
protection must be provided separately.
24V supply
Low-voltage circuits must be supplied by an isolated source with a maximum output voltage that
does not exceed 30V
DC
. Also note the technical specifications for terminal X11 in the chapter
X11: 24V supply [}86].
Conductors
Power terminals: Use 60/75°C copper conductors only.
Fuses
Fuses must be approved for DC voltage in accordance with UL 248.
§ Use a 1A fuse (time delay) upstream of relay 1. Observe the terminal description for X1, pin
1 in the chapter X1: Enable and relay 1 [}76].
§ Provide the supply for the brake using a 4A fuse (time delay). Observe the terminal
description for X6 in the chapter X6: Brake – Feedback and supply (ST6 option) [}82].
§ For the STO safety function via terminal X12: Use a 4A fuse (time delay) to protect the
supply voltage of the status signal. Observe the terminal description for X12 in the chapter
X12: Safety technology (ST6 option) [}87].
§ The following applies to interface extensions with terminal module XI6, RI6 or IO6: Provide
the 24V
DC
supply using a 1A fuse (time delay). Observe the terminal description for X101,
pin 18 or 19 in the chapter X101: BE1 – BE5, BA1 – BA2 [}103].
Branch circuit protection
Integral solid state short circuit protection does not provide branch circuit protection (line fuse)
upstream of the drive controller. Branch circuit protection must be provided in accordance with
the manufacturer instructions, the National Electrical Code, the Canadian Electrical Code, part
1, and any additional local codes.
UL test
Only the risks of electric shock and the risk of fire have been examined during UL acceptance at
STOBER. Functional safety aspects have not been assessed during the UL approval process.
These are assessed for STOBER by bodies such as the TÜV SÜD certification service.
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