Auxiliary Circuits - PowerTec 2000C Instruction Manual

Figure 17: Connections for the frequency output of
the the non-regenerative Models 2000C and 3000C.
The frequency input for any POWERTEC motor
control may come from another POWERTEC motor con-
trol, since there is a frequency output located on the Speed
Regulator Board, part # 4001-141107. (Figure 17 shows
the Model 2000C and 3000C NON-REGEN drives con-
nections).
Terminal 15 on TB2 is the collector of a transistor
(TB2 terminal 12 is the common) which switches at twice
the RPM of the motor. If a resistor (1 Kohm minimum) is
connected from TB2 terminal 17 (+24VDC) to TB2 termi-
nal 15, a frequency signal will be generated which is
capable of driving the input to another. Connect TB2
terminal 15 on the first control to TB1 terminal 11 on the
second control, and connect TB2 terminal 12 on the first
control to TB1 terminal 9 on the second control. Connect
TB2 terminal 17 on the first control to TB1 terminal 10 on
the second control to switch it to digital mode.
With this arrangement (Figure 18), the second motor
will operate at exactly the same speed as the first, as long
as current limit is avoided on the second control. If the first
control encounters current limit, or changes speed for any
other reason, the second one (the follower) will follow it
down in speed, even to zero speed.
Figure 18: Connections for a POWERTEC
Brushless DC drive to follow a Non-regenerative
Model 2000C or Model 3000C at a 1:1 ratio.
20
Page

4.6 AUXILIARY CIRCUITS

This section concerns relays which are allowed to be
used with power from the Brushless motor control, as well
as some other circuits. Only those relays listed in this
section are authorized to be operated from the Model
2000C supplies. If any other relays are operated from the
supplies, it is at the user's risk. DO NOT USE MORE
THAN TWO OF THESE RELAYS AT THE SAME TIME!
Auxiliary power supply boards (part # 4001-127101) are
optionally available for powering any additional relays.
RUN RELAY
Figure 19: Connections to add an auxiliary RUN
relay to a Model 2000C or Model 3000C.
A 48VDC small control type relay (coil current of 20
mA or less) may be connected to the Brushless DC motor
control in the manner depicted in Figure 13. The connec-
tions on the left of the terminals are located on the Speed
Controller Board (part # 4001-147101). The equipment to
the right of the terminals are user connections.
A relay to be recommended is a type equivalent to
Potter & Brumfield part number KHU17D11-48, which
has a low current draw of 15 milliamps for a four-pole
double-throw relay.
The diode shown across the coil is necessary to
prevent damaging transients when the relay shuts off. DO
NOT OPERATE THIS CONFIGURATION WITHOUT
THE DIODE.
It is a good idea to keep the coil current as low as
possible when connecting relays to the control. Using an
auxiliary relay makes additional RUN contacts available
(there is only one on the board), and allows the use of one
of the contacts to interlock the JOG button to prevent
activation of the JOG circuit while operating in the RUN
mode.
When distances of more than 30 feet are involved, it
is advisable to use 110VAC control relays for an operating
interface to the controls.
Model 2000C / 3000C Manual