5 Application Examples
5.1 Setting up the Option for Standard Use
e3
0b
a9
66
.1
4
Digital input
PTC
sensor
Non-hazardous area
Hazardous
area
X44/
PTC Thermistor Card
MCB 112
1 2 3 4 5 6 7 8 9 10 1112
DI
DI
Safe Torque Off
12 13 18 19 27 29 32 33 20 37
e.g. Par 5-15
Par. 5-19
Terminal 37 Safe Stop
Illustration 9: Standard use of VLT
®
PTC Thermistor Card MCB 112
Table 3: Programming Example 1
Option number Option name Description
Parameter 5-19 Terminal 37 Safe Stop
[4]
PTC 1 alarm
If the motor temeprature is too high or if a PTC failure occurs, the MCB 112 activates the STO.
Terminal 37 goes low (active), and digital input 33 goes high (active). This parameter decides
the consequence of the Safe Torque Off (STO). With this selection, the drives coasts and the
LCP shows
alarm 71, PTC 1 safe stop
. Reset the drive manually from the LCP, digital input, or
fieldbus when the conditions of the PTC are acceptable again (motor temperature has drop-
ped).
Parameter 5-15 Terminal 33 Digital Input
[80]
PTC card 1
Connects the digital input of terminal 33 in the drive to the MCB 112, which enables the MCB
112 to indicate when the STO has been activated from here.
Alternatively,
Parameter 5-19 Terminal 37 Safe Stop
could be set to
[5] PTC 1 Warning
, which means an automatic restart when the
conditions of the PTC circuit have returned to acceptable. The selection depends on customer demands.
AQ267038105120en-000101 / 130R0104
24 | Danfoss A/S © 2022.08
Application Examples
VLT® PTC Thermistor Card MCB 112
Operating Guide
Summary of Contents for VLT PTC Thermistor Card MCB 112
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