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Installation and Wiring Instructions
Installing the cascade controller option card
This chapter provides instructions for installing the
cascade controller option card into a VLT adjustable
frequency drive. In Standard cascade control mode,
the option card installs into the VLT controlling up to
four additional motors. In Master/Slave mode, the
option card installs in the Master drive controlling
up to four additional slave drives.
Relay output connections vary according to the mode
of operation and configuration of the system. Typical
wiring diagrams are also provided in this chapter.
Adhere to all safety guidelines provided in
the VLT Operating Instructions. See the
VLT Operating Instructions for details and for
instructions on drive operation.
Torque tightening requirements
Tighten all fittings described in this chapter to 7.1
in-lbs (0.8 Nm), unless specified otherwise.
Optional transmitter connections
VLT drive terminals12 and 13 provide a 24 VDC,
200 mA power supply. This supply can be used
to power remote transmitters without need for an
external power supply. See wiring instructions in
Chapter 10, Feedback Transmitter Wiring.
MG.60.I3.02 - VLT is a registered Danfoss trademark
Cascade Controller Option
DANGER
VLT adjustable frequency drive
contains dangerous voltages when
connected to line voltage. After
disconnecting from line, wait at least 14 minutes
before touching any electrical components.
WARNING
Only a competent electrician should
carry out electrical installation.
Improper installation of motor or VLT
can cause equipment failure, serious injury
or death. Follow this manual and National
Electrical Code and local safety codes.
CAUTION
Electronic components of VLT
adjustable frequency drive are
sensitive to electrostatic discharge
(ESD). ESD can reduce performance or destroy
sensitive electronic components. Follow
proper ESD procedures during installation
or servicing to prevent damage.
9
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