Saftronics SH6 Series, Manual, Page: 7 / 24

SH6- HEATER CONTROLLER SERIES
PHASE ROTATION - In order to prevent misfiring in the
case of swopped phases, a phase rotation sensing
circuit has been installed. If phases are swopped, start
up is inhibited and the PHASE LED extinguishes.
THERMAL CUT-OUT - A thermal cut-out element is
mounted near the power devices. This element is a
normally closed contact, which opens at approximately
80 degrees. In order to protect the drive, should the
temperature rise, the element must be connected in the
stop circuit of the drive.
dv/dt SUPPRESSION - The power devices have been
suppressed by means of an RC network to ensure that
their dv/dt ratio is not exceeded.
LINE IMPEDANCE - For increased protection against
noise and overvoltages as well as for short circuit
protection it is recommended that AC line reactors are
used. Consult Saftronics in this regards.
ISOLATION - The control circuits are electrically isolated
from the power circuits.
1.5 INDICATORS
There are 4 LED indicators on the PC550/7 control card.
PHASE ROT- If the drive is correctly phased with
the incoming supply the PHASE
LED will be lit.
+12V - If the power supplies on the
PC550/7 control card are healthy the
+V LED will be lit.
RUN - When the drive is started the RUN
LED will light. The RUN LED is
extinguished when the drive is
stopped.
BYPASS - When the Bypass Timer has been
selected, the BYPASS LED will be lit.
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