Danfoss VLT Operating Instructions Manual - Page 10
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Installation
3.3 Installation in Combination with VLT
PTC Thermistor Card MCB 112
NOTICE
Combination of VLT
3
3
STO function is only available for VLT
®
102, VLT
AutomationDrive FC 302, and VLT
AutomationDrive FC 301 enclosure type A1.
®
VLT
PTC Thermistor Card MCB 112 uses Terminal 37 as its
safety-related switch-off channel.
•
Ensure that the output X44/12 of MCB 112 is
AND-ed with the safety-related sensor (such as
emergency stop button, safetyguard switch, etc.)
that activates STO. This means that the output to
STO terminal 37 is HIGH (24 V) only if both the
signal from MCB 112 output X44/12 and the
signal from the safety-related sensor are HIGH. If
at least 1 of the 2 signals is LOW, then the output
to terminal 37 must be LOW too.
•
Ensure that the safety device with AND-logic
complies with the needed safety level.
•
Short-circuit protect the connection from the
output of the safety device with safe AND-logic
to the STO terminal 37, see Illustration 3.3.
8
Operating Instructions
®
PTC Thermistor Card MCB 112 and
®
HVAC Drive FC
®
Danfoss A/S © 09/2014 All rights reserved.
®
Hazardous
Area
X44/
PTC
Sensor
Par. 5- 19
Terminal 37 Safe Stop
Illustration 3.3 Combination of an STO Application and an
MCB 112 Application
Illustration 3.3 shows a Restart input for the external safety
device. This means that in this installation, 5-19 Terminal 37
Safe Stop can be set to value [7] PTC 1 & Relay W or [8] PTC
1 & Relay A/W. Refer to VLT
Operating Instructions for further details.
-
Non
Hazardous Area
PTC Thermistor Card
MCB112
1
2
3
4
5
6
7
8
9
10
11
12
Digital Input
e.g. Par 5-15
12
13
18
19
27
29
32
33
20
37
DI
DI
Safe Stop
Safety Device
SIL 2
Safe AND Input
Safe Output
Manual Restart
®
PTC Thermistor Card MCB 112
MG37D202