Output Contactor; Motor Feedback Cable; Control Connections - PowerTec 2000C Instruction Manual

4.3.3 OUTPUT CONTACTOR

If an output contactor is used with the Model 2000C
or Model 3000C motor control, provisions MUST be made
in the control circuits to interlock the output contactor with
the Emergency Stop circuits. If the output contactor is not
properly interlocked with the motor control, damage to the
motor control WILL result.
The requirements are:
1. The contactor must close the main power
contacts BEFORE the 2000C or 3000C is enabled; AND
2. The contactor may only open its contacts AFTER
the 2000C or 3000C is disabled.
3. The contactor must be able to carry the rated
motor current, but is not required to make or break higher
levels of current, as AC motors must do.
Figure 15 shows the plan for connections for using a
separately powered output contactor (which is available
from POWERTEC) with the Model 2000C or 3000C
control. In this configuration, the contactor will energize
when there is a run command and de-energize ONLY on an
emergency stop. The contactor will stay energized during
normal stops.
POWERTEC makes available a track mount PC
board (Part # 4001-156012) with the circuitry shown for
sequencing of output contactors and dynamic braking
contactors.
DO NOT break the ground connection or the cable
connections with the output contactor.
It is strongly recommended that a maintained type of
Emergency Stop button (twist or pull to release) be used in
any Emergency Stop system.
ALWAYS BE SURE THAT EMERGENCY STOP
HAS BEEN ACTIVATED BEFORE GOING NEAR
DRIVEN EQUIPMENT USING AN OUTPUT CON-
TACTOR CONNECTED AS SHOWN.
Figure 15: Connecting an output contactor with a
48VDC coil to a Model 2000C or 3000C.
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4.3.4 MOTOR FEEDBACK CABLE

The encoder feedback cable must be a shielded
cable. See Figure 8 on page 1-10 for shield connections at
the motor end. The shield is connected to TB1 terminal 1
on the control end. Standard installation calls for a nine
conductor shielded cable (Belden part #9539 or equiva-
lent). The colors of this cable correspond to the colors of
the wires in the motor and on the connection diagram. The
Purple and White wires may be interchanged without ill
effect. Likewise, the connections on TB5 terminals 1 and
3 may be reversed without difficulty.
If the motor thermal is used in a 120VAC circuit, it
should be wired outside of the cable, and seven conductor
shielded cable may be used. In this case, if the cable wire
colors are different from the diagram, they need to be
checked to be sure that the proper connections are made.
The shield must be continuous from the motor to control.
Do NOT ground the shield at intermediate points. This
applies to junction boxes between motor and drive.
DO NOT USE THE SHIELD OF THE ENCODER
CABLE AS AN ACTIVE CONDUCTOR !

4.4 CONTROL CONNECTIONS

The control circuits of the POWERTEC Brushless
DC Models 2000C and 3000C motor controls operate on
48VDC. This voltage is derived from the raw +24VDC
(with respect to common) and the raw -24VDC supplies.
Using 48VDC tends to balance the load of relays and other
devices on the supplies instead of placing the burden on
one of the supplies, and requires less operating current than
24VDC devices.
Some of the relays used with the Models 2000C and
3000C must be 24VDC when used with open collector
functions (see Section 4.6). The maximum current from
each of the raw supplies is 50 milliamps. Due to this supply
limitation, when several 24VDC external relays are used,
they should be externally powered.
THE POWER SUPPLIES OF THE MODELS 2000C
AND 3000C SHOULD NOT BE USED FOR EXTER-
NAL EQUIPMENT! POWERTEC has an optional power
supply (part #127101) available to supply additional power.
It is possible to operate the control circuits with a
variety of devices. Standard operator devices may be used,
but the current flowing through these devices is very small.
When control pushbutton and other operators are to be
located more than 30 feet away from the motor control, the
use of 120VAC control circuits should be considered. The
120VAC relays must be run by a customer-supplied trans-
former, and normally open and normally closed contacts
substituted for the normally open and normally closed
contacts shown in the connection diagram (Figure 13).
Take note in the last section of the use of 120VAC on the
motor thermal.
Model 2000C / 3000C Manual