Phasetronics
Page 14
5.5 Option “KB”
The Offset (P1) and Gain (P2) adjustments are factory set for a 4-20ma input signal. If needed, they can
be used to tailor the output voltage to meet most applications. When a Manual Potentiometer is used in
conjunction with the Automatic signal, an Auto/Manual switch for selectable Local/Automatic operation
should be added. (see Section 7.2).
The standard Power On Soft Start is adjustable from 0.5 seconds when fully counter clockwise to 25
seconds when set fully counter clockwise.
The integral Load Voltage Regulation feature provides a means of stabilizing the output voltage when
input voltage variations are present .The output voltage is monitored thru the onboard feedback
transformer and the control loop compares it to the command signal to provide regulation. Output
regulation of +/-2% over a +/-10% input voltage swing can be beneficial in heating or other critical
applications where stability and repeatability is of concern. This feature is factory calibrated. Adjusting the
Feedback potentiometer will cause the units regulation to be affected and should be avoided.
5.6 K Series Option, Soft Start
This feature is standard on all K options and is slightly different than the standard "non K" series option. It
provides a soft start at Power Up, on a Current Trip Reset (if using Option KD or KE) or when Lockout is
released. It protects fuses from inrush currents and is well suited for high inrush loads and delicate heater
elements. The ramp rate is adjusted by the P5 potentiometer on the option card. When set at minimum
(fully counter clockwise) the ramp time is ~0.5 seconds to 100% output. When set at max (fully clockwise)
the ramp time is ~24 seconds. This option can also be disabled by removing the "X3" jumper on the
option card, see section 7 for the jumper location.
5.7 K Series Voltage and Current Feedback Signals (Efb and Ifb)
All K series option cards come with two 0-10vdc output signals that represent the 0 to100% output current
and voltage of the unit. Both signals are low impedance output (470 ohms) and can drive up to 2ma. The
Ifb signal is available between pins 8 & 9 on TB1 where pin 9 is the common and pin 8 is the 0-10vdc
output. The Efb signal is available between pins 9 & 10 on TB1 with 9 being the common and 10 as the
output. Both feedback signals are factory calibrated. Fine tuning for a specific application or scale is
available by potentiometers P4 for the Efb and P9 for the Ifb. A clockwise turn will increase the output and
a counterclockwise adjustment will decrease the output.
5.8
Option “KG” (Option KB with the addition of Current Limit)
Provides an additional layer of protection for dynamic and non-linear loads. Adjustable from 0-125% of
the units rating, this option will override the control signal to limit the output current to a preset level.
By adjusting the Current Limit pot P8 on the option card, the level can be set to zero at the fully counter
clockwise position or up to 125% of the units rating when at the fully clockwise position. This feature is
useful when the load can vary during process transitions or during a start-up condition. This option can
also be disabled by removing the "X4" jumper on the option card if necessary.
