Precision Control Systems 1029C - Manual (Page 8)

MODEL 1029C 4 10/19/2007
INSTALLATION
TRANSFORMER TAP:
Open lid and locate power transformer. Check voltage tap
is on desired line voltage.
MOUNTING AND LOCATION:
Mount controllers on a vertical surface with the fins
oriented so that air may flow vertically between them. For
controllers with fans (excludes the 50 & 80 amp units) may
be mounted in any direction.
COMMAND INPUTS:
The 1029C has two command inputs (RUN and IDLE)
which are selected by a contact closure. A potentiometer,
a DC voltage or a DC current may be used as a command
signal into either input. These connections are made to the
command connector as described below.
Run/Idle:
A remote switch can be used, as shown in Figure 10 , to
cause the controller to be controlled by either the run or idle
inputs. Connecting terminal 10 (COM) to terminal 11 (RUN/
IDLE) on the command connector causes the run signal
input to be in control. Opening the connection between
terminal 10 and terminal 11 causes the idle signal input to
be in control.
COMMAND SIGNAL OPTIONS
Voltage:
A 0 to 5 Vdc signal may be used as the command signal
by connecting the positive signal to terminal 13 (run), or
terminal 15 (idle). Always connect negative (common)
signal to terminal 14 (common). See Figure 9 or Figure 11 .
Current:
Connect positive current connection to terminal 13 (run)
or terminal 15 (idle). Connect negative or return current
connection to terminal 14 (common). See Figure 9 or
Figure 11 .
When using a current command in both the run and
idle command input, they must either be sourcing, or be
isolated from one another. Contact factory for details.
R
ECOMMENDED TIGHTENING TORQUE
FOR EDGE CARD CONNECTOR
:
W
IRE
S
IZE
(
AWG
) T
ORQUE
14
TO
26
GA
4.4 - 5.5
IN
-
LBS
Potentiometer:
A 1k ohm to 20k ohm potentiometer, 1/4 watt or more, may
be used to adjust the load voltage. (A 1k ohm potentiometer
provides the maximum linearity.) See Figure 8 or Figure 10 .
Consult factory for other options.
POWER & SAFETY CONNECTIONS
Over Current Trip Relay:
Connections to the form C contacts of the over current
relay are shown in Figure 7 . The contacts are rated for 5
Amps at 120 Vac and are intended for activating an alarm
and/or removing power from the system by operating a
contactor or a circuit breaker.
Over Current Trip Reset:
Momentary closure of a switch connected between
terminals 9 and 10 on the command connector will reset
the over current relay and will release the SCRs from the
locked off state. The reset switch can also be used as an
on off control. Closure of the switch causes the SCRs to be
immediately turned OFF. When the switch is opened, the
SCRs begin operation at zero conduction angle and slew at
the soft start rate to the desired output. The Over Current
Trip circuit may also be reset by a momentary interruption
of supply power.
Shorted SCR Relay:
Connections to the 5 Amp 120 Vac form C contacts are
shown in Figure 7 . This relay energizes if an SCR fails
in the shorted mode and is intended to activate an alarm
and/or cause power to be removed from the system by
operating a contactor or a circuit breaker.
Power Connections:
Figure 15 & Figure 16 show typical electrical connections.
The LINE 1 and LOAD 1 connectors are approved for wire
sizes from 6ga to 500 MCM.
R
ECOMMENDED TIGHTENING TORQUE
FOR THE LINE AND LOAD CONNECTORS
:
W
IRE
S
IZE
(
AWG
)
OR
C
IRCULAR
M
ILLS
T
ORQUE
4
TO
6
GA
1
TO
2
GA
1/0
TO
2/0
GA
3/0
TO
4/0
GA
250
TO
350
MCM
500
MCM
100
IN
-
LBS
125
IN
-
LBS
150
IN
-
LBS
200
IN
-
LBS
250
IN
-
LBS
300
IN
-
LBS