Siemens 7sg15 microtapp - Page 84

7SG15 MicroTAPP Application Guide
Motor
Contactors
Step by Step
Directional Sensing
Switch (closed
during tap change)
DSS open
during tap
change
Operating
handle
Interlock
Limit
Switches
Lower
Raise
Master Lockout
reset coil
(example only)
110V ac CONTROL
SUPPLY
Raise
Local Remote
Lower
Tap Change
mounted control
S2
RL5
RL4
RL2
POWER
SUPPLY
S3
MicroTAPP
Raise
Lower
Lockout
CASE EARTH
Master Lockout or
Permissive relay
(runaway prevention)
Raise from T/C
Lower from T/C
Block Raise
Block Lower
Ballast Resistor
if Required
MicroTAPP
enabled
S1
S7
In Progress
Blocking Contacts
are Optional
"Tap Changer scheme"
setting in "Basic" mode
MicroTAPP - Typical Tap Change
Control Circuit using step-by-step
contactor
©2011 Siemens Protection Devices Limited Chapter 5 Page 20 of 21