11.2.6
VLT
®
PTC Thermistor Card MCB 112
The MCB 112 option makes it possible to monitor the
temperature of an electrical motor through a galvanically
isolated PTC thermistor input. It is a B option for frequency
converter with Safe Torque Off.
For different application possibilities, see
chapter 10 Application Examples.
X44/1 and X44/2 are the thermistor inputs. X44/12 enables
Safe Torque Off of the frequency converter (T-37), if the
thermistor values make it necessary, and X44/10 informs
the frequency converter that a request for safe torque off
came from the MCB 112 to ensure a suitable alarm
handling. One of the digital inputs parameters (or a digital
input of a mounted option) must be set to [80] PTC Card 1
to use the information from X44/10. Configure
5-19 Terminal 37 Safe Stop to the desired Safe Torque Off
functionality (default is Safe Stop Alarm).
MS 220 DA
11
10
20-28 VDC 10 mA
12
20-28 VDC
60 mA
com
ZIEHL
X44
12 13 18 19 27 29 32 33 20 37
3
NC
4
NC
5
NC
6
NC
7
NC
8
NC
9
NC
10 11
NC
121
T1
2
T2
T
P
T
P
PTC
M3~
130BA638.10
DO
Motor protection
MCB 112 PTC Thermistor Card
Option B
Reference for 10, 12
DO FOR SAFE
STOP T37
Code No.130B1137
Control Terminals of FC302
Illustration 11.15 Installation of MCB 112
ATEX Certification with FC 102, FC 202 and FC 302
The MCB 112 has been certified for ATEX, which means
that the frequency converter with the MCB 112 can be
used with motors in potentially explosive atmospheres. See
the VLT
®
PTC Thermistor Card MCB 112 Operating
Instructions for more information.
Illustration 11.16 ATmosphère EXplosive (ATEX)
Electrical Data
Resistor connection
PTC compliant with DIN 44081 and DIN 44082
Number 1..6 resistors in series
Shut-off value 3.3 Ω.... 3.65 Ω ... 3.85 Ω
Reset value 1.7 Ω .... 1.8 Ω ... 1.95 Ω
Trigger tolerance ± 6 °C
Collective resistance of the sensor loop < 1.65 Ω
Terminal voltage ≤ 2.5 V for R ≤ 3.65 Ω, ≤ 9 V for R = ∞
Sensor current ≤ 1 mA
Short circuit 20 Ω ≤ R ≤ 40 Ω
Power consumption 60 mA
Options and Accessories
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
MG33BF02 - Rev. 2013-12-20 161
11 11
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