Combination With Other Components Using Sto - Danfoss VLT PTC Thermistor Card MCB 112 Operating Manual

VLT® PTC Thermistor Card MCB 112
Operating Guide

5.2 Combination with Other Components using STO

Hazardous Non-hazardous area
area
PTC Thermistor Card
X44/ 1 2 3 4 5 6 7 8 9 101112
PTC
sensor
12 13 18 19 27 29 32 33 20 37
Par. 5-19
Terminal 37 Safe Stop
Illustration 10: More Safety Devices in Combination with STO and VLT
Table 4: Programming Example 2
Option number Option name
Parameter 5-19 Terminal 37 Safe Stop
[6] PTC 1 & Relay
alarm
Parameter 5-15 Terminal 33 Digital Input
[80] PTC card 1
Alternatively, parameter 5-19 Terminal 37 Safe Stop could be set to [7] PTC 1 & relay warning. Selecting this option causes an automat-
ic restart when the conditions of the PTC circuit and/or emergency stop circuit have returned to normal. The selection depends on
customer demands. Also, the setting of parameter 5-19 Terminal 37 Safe Stop could be [8] PTC 1 & relay A/W or [9] PTC 1 & relay W/A,
which is a combination of alarms and warnings. The selection depends on customer demands.
Selections [4] PTC 1 alarm to [9] PTC 1 & relay W/A in parameter 5-19 Terminal 37 Safe Stop are only visible if the MCB 112 is plugged
into the B-option slot.
Danfoss A/S © 2022.08
MCB 112
Digital input
e.g. Par 5-15
DI DI
STO
Safety device
SIL 2
Safe AND input
Safe output
Manual restart
Description
If the motor temperature is too high, or if a PTC failure occurs, the MCB 112 activates the
STO of the drive. 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 selec-
tion, the drive coasts and the LCP shows alarm 71, PTC 1 safe stop. Reset the drive man-
ually from LCP, digital input, or fieldbus when the conditions of the PTC are acceptable
again (motor temperature has dropped). An emergency stop can also activate STO. Ter-
minal 37 goes low (active), but MCB 112 X44/10 does not trigger digital input 33 as the
MCB 112 did not have to activate the STO. Therefore, digital input 33 remians high (inac-
tive).
Connects the digital input of terminal 33 to the MCB 112, which enables the MCB 112 to
indicate when STO has been activated from here.
N O T I C E
PTC Thermistor Card MCB 112
®
Application Examples
AQ267038105120en-000101 / 130R0104 | 25