Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 21

Application Examples
Parameter 5-19 Terminal 37 Safe Stop
[6] PTC 1 &
Relay Alarm
5 5
5-15 Terminal 33 Digital Input
[80] PTC Card 1
Table 5.2 Programming Example 2
Alternatively, parameter 5-19 Terminal 37 Safe Stop could be
set to [7] PTC 1 & Relay Warning. Selecting this option
causes an automatic 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.
NOTICE
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.
NOTICE
Take care that the digital input set to [80] PTC Card 1 is
not also configured as thermistor resource (motor
overload protection) in 1-93 Thermistor Resource.
18
VLT
If the motor temperature is too high, or if a
PTC failure occurs, the MCB 112 activates the
STO of the frequency converter. 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 frequency converter
coasts and the LCP displays Alarm 71 PTC 1
Safe Stop. Reset the frequency converter
manually from LCP, digital input, or fieldbus
when the conditions of the PTC are
acceptable again (the motor temperature has
dropped). An emergency stop can also
activate STO. Terminal 37 goes LOW (active),
but MCB 112 X44/10 does not trigger digital
input 33 as the MCB 112 did not need to
activate the STO. Therefore, digital input 33
remains HIGH (inactive).
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.
Danfoss A/S © 01/2015 All rights reserved.
®
PTC Thermistor Card MCB 112
MG33V302