VMX Quick Setup Guide 12 | P a g e
Control Fusing
Output relays in TB2 must be protected from currents in excess of 5A, either with a fuse or with other
suitable current protection devices.
A dedicated fault output for use in PLC or interposing relay control is available on TB1. This opto-isolated
triac switch is rated for 50mA max., 10-250V AC. Any circuit connected to it must be fused accordingly.
Three-Wire Control Connection
For standard 3-wire control, connect dry (voltage free) contacts for the Stop / Start buttons as shown on the
diagram directly above the terminal strip. Connect the NO contact of the Start button to Terminal 1 (far left
terminal), the common point between the Stop and Start to Terminal 2 (2
nd
from left) and the NC from the
Stop button to Terminal 3 (3
rd
from left).
Seal In Contact
The VMX Series uses an internally pre-wired “seal-in”
contact around the Start button (Terminals 1 and 2). No
external relay or auxiliary output connection is necessary.
Two Wire Control: Relay / PLC Connection
An alternate connection for automated or unattended
operation replaces the start/stop push buttons by connecting
a dry (voltage free) maintained contact closure between
terminals 1 and 3 as shown in Figure 5.3. When this contact
is closed, the VMX Series starter will start and run. When it
is opened, it is the same as a Stop command.
Note: When a maintained contact is used for start/stop it is
advisable to set the overload relay to the manual reset
position. This will prevent the motor from restarting if the
thermal overload trips and then cools down.
CAUTION!
Control Terminals 1-10 of TB1 are configured using solid state devices powered
internally with a 24VDC power supply. To prevent damage to the VMX Series control
board, use dry (unpowered) contact closures only when connecting to these terminals.
If existing 120VAC or other powered control circuit must be interfaced, use isolating
relays and control the VMX Series with 2 wire control as shown above.
Interlock Connection
TB1 provides a connection point for an external dry (voltage free) N.C. (Normally Closed) interlock device
between terminals 4 and 5. Examples where this interlock connection would be used include low oil, high
temperature, or excess vibration dropout from user supplied
devices. A factory-installed jumper is provided which allows
the VMX Series unit to operate if external interlocks are not
used. If this jumper is removed and an interlock is not used,
the VMX Series unit will not function.
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