Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 29)

21
START/STOP pushbuttons
Installation
Pushbutton operation of the DC3N drive requires that a
(momentarily) normally-closed STOP pushbutton be wired
to terminals B2 and B3 and a (momentarily) normally-open
START pushbutton wired to terminals B1 and B2. These
pushbuttons must be used together and are not included
with the drive. The B1, B2 and B3 terminals are on
terminal block 502 (TB502).
IMPORTANT : If the START/STOP pushbuttons are not
used, wire a jumper between terminals B1 and B3 to
bypass the latching circuit. The drive will then operate in a
power-up start mode. See Figure 6 (page 23) for these
switch connections.
ATTENTION: Starting and stopping with the start/stop
terminals does not disconnect AC power in the stop
position. A hardwired AC power disconnection switch
must be mounted between the AC source and terminals
L I and L2. This is required, as the DC3 drive does not
have an armature loop contactor. A single fault like a
power device short may cause motor rotation when in
the stop mode. The user is responsible for assuring safe
conditions for operating personnel by providing suitable
guards, audio or visual alarms, or other devices. Failure
to observe these precautions could result in bodily
injury.
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