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2.5 Safety Precautions
W A R N I N G
EXPLOSION HAZARD
Using the VLT
®
PTC Thermistor Card MCB 112 in areas with explosive gas and/or dust atmospheres may lead to death, personal
injury, or property damage. To avoid the risk, adhere to the following:
Always provide the MCB 112 with a pressurized enclosure according to EN 60079-1 (Explosive atmospheres - Part 1: Equip-
ment protection by flameproof enclosures "d").
Observe national safety rules and regulations for prevention of accidents, as well as the European Standard EN 60079-14
(Explosive atmospheres - Part 14: Electrical installations design, selection, and erection).
Only qualified personnel is allowed to install, connect, and commission the MCB 112.
Ensure that the motor thermal protection switches off the motor directly, via the Safe Torque Off (STO) function, and/or by
using the ATEX ETR thermal monitoring function.
W A R N I N G
FIRE HAZARD
Using the VLT
®
PTC Thermistor Card MCB 112 in areas with combustible dust may lead to death, personal injury, or property dam-
age. To avoid the risk, adhere to the following:
Always provide the MCB 112 with a dust-proof enclosure according to IEC 60529.
Observe national safety rules and regulations for prevention of accidents, as well as the European Standard EN 60079-14
(Explosive atmospheres - Part 14: Electrical installations, design, selection, and erection).
Only qualified personnel is allowed to install, connect, and commission the MCB 112.
For more information on qualified personnel, see
W A R N I N G
UNINTENDED START
When the drive is connected to AC mains, DC supply, or load sharing, the motor may start at any time, causing risk of death,
serious injury, and equipment or property damage. The motor may start by activation of an external switch, a fieldbus command,
an input reference signal from the LCP or LOP, via remote operation using MCT 10 setup software, after a cleared fault condition,
or after the motor and motor thermistors have cooled down.
Press [Off] on the LCP before programming parameters.
Disconnect the drive from the mains whenever personal safety considerations make it necessary to avoid unintended motor
start.
Check that the drive, motor, and any driven equipment are in operational readiness.
C A U T I O N
RISK OF INJURY AND EQUIPMENT DAMAGE
Read and observe this operating guide and the safety warnings before installing the VLT
®
PTC Thermistor Card MCB 112. Not
adhering to the instructions and warnings in this manual may lead to personal injury, property and equipment damage.
AQ267038105120en-000101 / 130R0104
12 | Danfoss A/S © 2022.08
Safety
VLT® PTC Thermistor Card MCB 112
Operating Guide
