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3 Installation
3.1 Safety Instructions
See chapter
Safety
for general safety instructions. Also, always observe the relevant drive operating guide and the instructions pro-
vided by the motor manufacturer.
3.2 Installing the VLT® PTC Thermistor Card MCB 112
W A R N I N G
DISCHARGE TIME
The drive contains DC-link capacitors, which can remain charged even when the drive is not powered. High voltage can be
present even when the warning indicator lights are off.
Failure to wait the specified time after power has been removed before performing service or repair work could result in death or
serious injury.
Stop the motor.
Disconnect AC mains, permanent magnet type motors, and remote DC-link supplies, including battery back-ups, UPS, and
DC-link connections to other drives.
Wait for the capacitors to discharge fully before performing any service or repair work. The discharge time is printed on the
type label of the drive and also specified in the
Discharge time
tables in the FC 102/202/302 Operating Guides.
Use a measuring device to make sure that there is no voltage, before opening the drive or performing any work on the ca-
bles.
C A U T I O N
Place the drive with VLT
®
PTC Thermistor Card MCB 112 (including the connection between output safe stop T37 output (X44/12)
on MCB 112 and terminal 37 input on the control card) in an IP54 enclosure as per IEC 60529.
C A U T I O N
RISK OF OVERVOLTAGE
Long cables (voltage peaks) or increased mains voltage may lead to overvoltage at the motor terminals and damage the equip-
ment.
Install a sine-wave filter.
N O T I C E
For motor connection, AC mains connection, and control wiring, follow the instructions for safe installation in the drive operating
guide and in the VLT
®
Frequency Converter - Safe Torque Off Operating Guide.
Procedure
Disconnect power to the drive.
Remove the LCP, the terminal cover, and the LCP frame from the drive.
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Danfoss A/S © 2022.08
Installation
VLT® PTC Thermistor Card MCB 112
Operating Guide