Phasetronics 1P1 Series Operation manual

TM
PHASETRONICS
SCR Power Control Specialists
MANUAL - 1P120600-REV3
REV 05/23/19
OPERATION AND SERVICE MANUAL
20 to 600 Amp Models
Single Phase SCR
1P1
Series

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Table of Contents
Chapter 1 - Introduction.............................................................................................................................4
1.1 General.........................................................................................................................................4
1.2 Receiving and Unpacking..............................................................................................................4
Chapter 2 - Specifications..........................................................................................................................5
2.1 Specification..................................................................................................................................5
2.2 Dimensions...................................................................................................................................6
2.3 Protective Networks ......................................................................................................................7
2.4 Ambient Temperature....................................................................................................................7
2.5 Cooling..........................................................................................................................................7
Chapter 3 - Installation...............................................................................................................................8
3.1 Location........................................................................................................................................8
3.2 Initial Unt Inspection......................................................................................................................8
3.3 Mounting and Cleaning..................................................................................................................9
3.4 Enclosure Ventilation.....................................................................................................................9
Chapter 4 - Connections ..........................................................................................................................10
4.1 Power Connections.....................................................................................................................10
4.2 Control Connections....................................................................................................................13
Chapter 5 - Options ..................................................................................................................................15
5.1 Option “B” (Standard on all 1P1 units) .........................................................................................15
5.2 Option "C" (Option B with the addition of Current Limit)................................................................15
5.3 Option “D” (Option B with the addition of Current Trip).................................................................15
5.4 Option “E” (Option B, C + D Combined).......................................................................................15
5.5 Option “KB” .................................................................................................................................16
5.6 K Series Option Soft Start............................................................................................................16
5.7 K Series Voltage and Current Feedback Signals (Efb and Ifb)......................................................16
5.8 Option “KC”: (Option KB with the addition of Current Limit ...........................................................16
5.9 Option “KD” (Option KB with the addition of Current Trip) ............................................................17
5.10 Option “KE” (Option KB, KC + KD Combined)..............................................................................17
5.11 Option “V” ...................................................................................................................................17
5.12 Option “T”....................................................................................................................................17
Chapter 6 - Start-Up..................................................................................................................................18
6.1 Manual Control (Options “B” and “KB”) ........................................................................................18
6.2 Automatic Control (Options (Options “B” and “KB”) ......................................................................19
6.3 Current Limit (Option “C” or “KC”) Start-up...................................................................................19
6.4 Current Trip (Option “E”) Start-up.................................................................................................20
6.5 Current Trip (Option “KE”) Start-up..............................................................................................20
6.6 Soft Start (Option “B-E” and “KB-KE”)..........................................................................................21
6.7 DC Voltage and Current Regulator (Option “V” or “T”)..................................................................22
Chapter 7 - Diagrams................................................................................................................................25
7.1 Option Board B, C, D & E...........................................................................................................25
7.2 Option Board KB, KC, KD & KE..................................................................................................27
7.3 Auto/Manual Switch for Options B, C, D, E, KB, KC, KD and KE..............................................26
7.4 Option Board V + T ....................................................................................................................28
7.5 Auto/Manual Switch for Option V or T..........................................................................................29

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Chapter 8 - Troubleshooting....................................................................................................................30
8.1 SCR Testing Procedure...............................................................................................................30
8.2 Replacing Printed Circuit Boards.................................................................................................31
8.3 Replacing SCR Devices..............................................................................................................32
8.4 Bench Calibration Procedure.......................................................................................................32
WARRANTY INFORMATION.....................................................................................................................35

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Chapter 1 - Introduction
1.1 General
The 1P1 series of power controls is a single phase controller available in 120 thru 575vac and with
current ratings from 20 to 600A. It provides smooth, phase angle control of back to back SCRs for 0-
100% output power control. It comes standard with an optically isolated 4-20ma signal input, a manual
potentiometer input and Load Voltage Regulation. The integral offset and gain adjustments allow tailoring
of the output power with respect to the control signal input. Optional features such as Current Limit and
Current Trip are also available. The SCRs are protected by MOVs (Metal Oxide Varistor) and a dv/dt
network as standard. The 1P1 series is well suited for a variety of loads including inductive, resistive and
high inrush.
1.2 –Receiving and unpacking
Upon receipt of this product you should immediately do the following:
•Inspect the unit for possible shipping damage (if damaged, you should notify the freight
carrier and file a claim immediately)
•Verify the model number on the unit matches your purchase order
Warning
DO NOT SERVICE EQUIPMENT WITH VOLTAGE APPLIED! Unit
can be a source of fatal electrical shocks!To avoid shock hazard,
disconnect all power sourcesbefore working on unit.

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Chapter 2 - Specifications
2.1 - Specifications
External Inputs
Milliamp Input
4-20 mA Input Impedance - 510 ohms.
Manual Control
10k ohm, 2 watt potentiometer, linear taper (customer provided).
Output Current Rating (Model dependent)
20 to 600 Amps.
AC Supply Voltage
120/208/240/380/415/480/575 Vac(+10% to -15%, 50/60 Hz) *
Type of Loads
Resistive / Inductive / Lamp.
Soft Start:
Options
B, C, D, E:
Set for initial half-second of operation at power on. Field
adjustable by potentiometer from 0.25 seconds to 60 seconds.
Ramp with DC signal change is factory set for 0.1 seconds
(adjustable with capacitor change.)
Options
KB, KC, KD & KE:
Set for initial half-second of operation at power on. Field
adjustable by potentiometer from 0.5 seconds to 25 seconds.
Ramp with DC signal change is factory set for 0.1 seconds
(adjustable with capacitor change.)
Options V & T:
Set for initial half-second of operation at power on. Field
adjustable by potentiometer from 1 second to 50 seconds.
Ramp with DC signal change is factory set for 0.1 seconds
(adjustable with capacitor change.)
Hard Firing Gate Pulse
A combination of a high-potential gate pulse and a rapid rise time
is used to prevent SCR damage due to di/dt stress.
Input Adjustments
(B,C,D,E,KB,KC,KD & KE)
Gain
4-20mA
Offset
50% of gain maximum
Regulation
Option:
B,C,D,E,KB,KC,KD & KE
Load voltage regulation of +/-2% over a +/-10 % line voltage
input change.
Option V & T
Specific to DC voltage applications, current and/or Voltage regulation
is 0.75%.
Protective
Networks
Fusing
Integral I²T fuse protects against short-circuit overloads.
Transient Voltage
Suppressor
Integral MOV (Metal Oxide Varistor) protects against
high potential transient voltage.
SCR Peak Inverse
Voltage (PIV Rating)
1500V
RC Snubber
RC snubber network prevents false firing due to dv/dt
characteristics
Ambient Temperature
Operating range is from 0°C thru 40°C (32°F thru 104°F)
* Dependent on model configuration

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2.2 - Dimensions
A H
B
W
DE
1P1 AMPS
H
(inch.)
W
(Inch.)
D
(Inch.)
E
(Inch.)
A
(Inch.)
B
(Inch.)
20-40
10.5
6.50
4.50
0.3125
9.875
5.875
75
10.5
6.50
6.00
0.3125
9.875
5.875
110-225
13.0
8.50
9.75
2.25
8.50
7.125
300-600
21.0
11.0
10.5
0.3125
19.25
9.25
C = Mounting Hole Diameter
D = Depth of the unit
Dimensionsaresubjecttochange

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2.3 - Protective Networks
Transient Voltage Suppressor (Standard): Integral MOV (Metal Oxide Varistor) protects against high
potential voltage spikes.
RC Snubber (Standard): RC Snubber networks are used to prevent false firing due to dv/dt
characteristics.
SCR Peak Inverse Voltage (PIV Rating) for line voltage 120 ~ 575V: 1500V for all models.
2.4 - Ambient Temperature
Ambient temperature operating range: 0 to 40 °C (32 to 104 °F).
Transportation and storage range: 0 to 65 °C (-30 to 149 °F).
Note: Output current rating decreases by 10% for each 5 °C rise (9 °F) in ambient temperature over 40 °C
(104 °F) to a maximum of 60 °C (140 ° F).
2.5 - Cooling
Units rated 20 to 225 Amps are convection cooled. Units rated 300 Amps and above arefan cooled.

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( )
( )
Chapter 3 - Installation
3.1 - Location
Proper location of the 1P1 Series isnecessary to achieve specified performance and normal operation
lifetime. The 1P1 Series should always be installed in an area where the following conditions exist:
• Ambient operating temperature:
0 to 40 degrees C (32 to 104 degrees F) - Type 1 ventilated enclosure
• Protected from rain and moisture
• Humidity: 5 to 95% non-condensing
• Free from metallic particles, conductive dust and corrosive gas
• Free from excessivevibration (below 0.5G)
• Open panel units must bemounted in theappropriate type of enclosure. Enclosure size and type must be
suitable to dissipate heat generated by the SCR power control. (NEMA 1 style enclosures can be forced
ventilated toreduce size.) Usethefollowingformulasforsizing non-ventilated enclosures:
Non-vented painted metal enclosures: FLA x 1.5 = sq. ft of exposed area
7
Non-vented stainless steel enclosures: FLA x 1.5 = sq. ft of exposed area
4
Mount units vertically so heat sink fins are parallel to vertical mounting surface. Non Fan cooled units
must be mounted with the power terminals located at the bottom to ensure proper cooling.
Notes:
- FLA is the 1P1 unit current rating.
- The area of the enclosure that is against the wall when mounted is not included in the "Exposed"
area for cooling considerations.
3.2 - Initial Unit Inspection
Prior to installing the 1P1 Series unit make a complete visual check of all the equipment for possible
damage in shipping and handling. Report damage immediately before attempting to run unit. Check for
loose mechanical assemblies or broken wires which may have occurred during transportation or
installation. Loose electrical connections will increase resistance and cause the unit to function
improperly. Prior to beginning the installation verify the 1P1 Series unit is rated for the proper voltage
and current for the load.
Warning
Do not service equipment with voltage applied! Unit can be source of fatal electrical
shocks! To avoid shock hazard, remove all sources of power before working on
controller. Warning labels must be attached to terminals, enclosure and control
panel to meet local codes.

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3.3 - Mounting and Cleaning
If mounting the 1P1 Series unit in an enclosure requires drilling or punching holes in the enclosure,
cover the electrical assembly to prevent metal filings from becoming lodged in areas which can cause
clearance reduction or actually short out electronics. After work is complete, thoroughly clean the area and
re-inspect the 1P1 Series unit for foreign material. Make sure to observe the required wire bending space
per NEC, NFPA and local codes when installing the unit. To maximize effective air flow and cooling, the
unit must be installed with its heat sink ribs orientedvertically and running parallel to themounting surface.
If theunit has afan,install unit so the fan blows upward vertically.
In dirty or contaminated atmospheres the unit should be cleaned on a regular basis to insure proper
cooling. Do not use any chemicals to clean the unit. To remove surface dust, use 80 to 100 psi clean dry
compressed air only. A three inch high quality dry paint brush is helpful to loosen the dust prior to using
compressed air on theunit.
WARNING!
Remove all sources of power before cleaning the unit.
3.4 –Enclosure Ventilation
75, 110 and 225Ampunitsrequire a 120cfmboxventilationfanforNEMA1 enclosures. 300Ampand
larger units require a 240 cfm vent fan. See example below.
Figure 1 - Enclosure
Note: Anybox sizeshouldbe selectedin coordination withminimum
field wiring bending space requirements per local and National
Electrical Codes.

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Chapter 4 - Connections
4.1 - Power Connections
4.1.1 - Options B, C, D, E, KB, KC, KD, KE
1. Connect the Line 1 input power cables to the terminal on the unit marked L1.
2. Connect the Load input power cable to the terminal on the unit marked T1.
3. Connect the Load output power cable and the L2 power cable together.
4. Using a 14awg, 600v wire, fused at 2A, connect the L2 power to TB2 pin 7 on the 1P1 unit option
card.
4.1.2 - Options V & T
1. Connect the L2 lead to TB4-4 on the PTR trigger card.
Note: The trigger card is located under the option card in units rated 20-75A.
See Fig 2a to 2c for overall wiring schemes.
Figure 2a: 20, 40, 75 AMP UNITS

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Figure 2b: 110, 140, 175 AMP UNITS

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Figure 2c: 225, 300, 400, 500, 600 AMP UNITS

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4.2 - Control Connections
4.2.1 Manual Control
1. The connection of the manual potentiometer is not required for automatic operation.
2. For B, C, D & E the potentiometer is connected to TB1 -3, -6 & -9. (Fig 3)
For KB, KC, KD & KE the potentiometer is connected to TB1-5, -6 & -7. (Fig 4)
For V or T there are two manual control potentiometers. (Fig 5)
The Voltage control potentiometer is connected to TB1-3, -4 & -5.
. The Current Control potentiometer is connected to TB1-8, -9 & -10.
Refer to Section 7 for specific option card type and connection locations.
3. Manual potentiometer is 10K ohm, 2 watts linear resistance taper.
4. If you are using only manual pot control, proceed to chapter 5 & 6 Start-up details.
10K
Ohm
2 Watt
Linear
Taper
TB1-6
(High)
TB1-3
(Wiper)
TB1-9
(Low)
Inc 10K
Ohm
2 Watt
Linear
Taper
TB1-5
(High)
TB1-6
(Wiper)
TB1-7
(Low)
Inc
Options B, C, D + E Options KB, KC, KD + KE
Figure 3 –Potentiometer Figure 4 –Potentiometer
10K
Ohm
2 Watt
Linear
Taper
TB1-3
(High)
TB1-4
(Wiper)
TB1-5
(Low)
Inc 10K
Ohm
2 Watt
Linear
Taper
TB1-8
(High)
TB1-9
(Wiper)
TB1-10
(Low)
Inc
Option V or T
Voltage section Current section
Figure 5 –Potentiometer

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4.2.2 Automatic Control
1. Connect the milliamp control signal to TB1 on the option board. Refer to section 7 for specific
option card type and connection locations.
TB2-1
TB2-2
+
-
4-20 mA
Input
Options B, C, D + E
Figure 6 –Analog Input
TB1-3
TB1-4
+
-
4-20 mA
Input
Options KB, KC, KD + KE
Figure 7 –Analog Input
TB1-1
TB1-2
+
-
TB1-6
TB1-7
+
-
Options V or T
4-20 mA
Input
4-20 mA
Input
Figure 8 –Analog Input
2. If both the manual and automatic control signals are needed, consider installing an auto/manual
switch. (See section 7) If both the manual and automatic signals are connected simultaneously
and an Auto/Manual switch is not used, the unit will follow the command signal with the larger
input value.

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Chapter 5 –Control Options
5.1 Option "B" (Standard on all 1P1 units)
Both, the 4-20 milliamp and Manual Potentiometer control signal inputs are standard. The Offset (R12) &
Gain (R15) adjustments allow for tailoring of the 4-20ma signal to scale the output voltage to 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).
The standard Power On soft start is adjustable from 0.25 seconds when fully clockwise to 60 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.
5.2 Option "C" (Option B 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 (R63) on the option card, the level can be set to zero at the fully
counter clockwise position to 125% of the units rating when at the fully clockwise position. This feature is
useful when the load canvary during process transitions or during a start-up condition. This option can
also be disabled by removing the "X2" jumper on the option card if necessary.
5.3 Option “D” (Option B with the addition of Current Trip)
The Current Trip option is over current protection that when activated will shut off the units current flow in
1/2 cycle of line power or less. It's peak current detector circuitry will initiate the shutdown sequence the
instant any peak current exceeds the Current Trip threshold set by potentiometer R42. The adjustment
range is 75% to 200% of unit rated current. The Sensitivity to a trip (lower threshold) is increased as the
adjustment is turned clockwise. Minimum Sensitivity is when the adjustment is turned fully counter
clockwise. Current Trip is a latched trip and requires a momentary manual reset via a normally open dry
contact connected to TB1-4 and TB1-7 or TB1-8. (See section 7).
5.4 Option “E” (Options B, C + D Combined)
Combination of options B, C and D.

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5.5 Option “KB”
Both, the 4-20 milliamp and Manual Potentiometer control signal inputs are standard. The Offset (P1) &
Gain (P2) adjustments allow for tailoring of the 4-20ma signal to scale the output voltage to 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).
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 "B" 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 “KC” (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.

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5.9 Option “KD” (Option KB with the addition of Current Trip)
The Current Trip option is over current protection that when activated will shut off the units current flow in
1/2 cycle of line power or less. Its peak current detector circuitry will initiate the shutdown sequence the
instant any peak current exceeds the Current Trip threshold set by potentiometer P6. The adjustment
range is 75 to 200% when going from fully counter clockwise to fully clockwise. The K series Current Trip
is not latching and is automatically reset after an adjustable time has expired. The Trip Reset time is
configured by two jumpers and adjusted by potentiometer, P7. The Short Range jumper X1 allows
adjustment from 1 to 12 seconds of delay before an automatic reset is attempted. The Long Range
Jumper X2 allows for adjustment from 10 to 21 seconds. Minimum time is with P7 fully counter clockwise.
Maximum time is with P7 fully clockwise.
5.10 Option “KE” (Options KB, KC + KD Combined)
Combination of options KB, KC & KD.
5.11 Option “V”
The V option is specifically designed for applications where DC voltage and/or Current regulation is
required. It comes standard with a manual pot and optically isolated 4-20ma input for both the Constant
Voltage and Constant Current commands. Its automatic crossover feature is standard and allows for
smooth transition from one regulation mode to another. The power on soft start feature prevents inrush
into filter circuits or dynamic loads and is adjustable from a minimum of 0.5 seconds with P7 fully counter
clockwise to a maximum of 25 seconds with P7 set fully clockwise. With regulation of typically better than
0.75%, it is well suited for plating rectifier, battery charging and any other application that requires a
constant voltage or current.
5.12 Option “T”
This option is the same as Option V with the addition of instantaneous Current Trip. This additional
protection feature monitors the peak output current and provides an adjustable Current Trip setting (P6)
of 50% when set fully counter clockwise to 200% when set fully clockwise. If a current trip occurs, the
units output is shut down in 1/2 line cycle or less and the onboard current trip relay contacts located at
TB4 are activated along with the red Current trip LED. The Trip condition is now latched until a normally
closed trip reset contact connected to TB1 pins 11 & 12 is momentarily opened. This allows the unit to
soft start back to the command value.

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Chapter 6 - Start-up
WARNING!
High Voltage present qualified personal only.
Equipment Required:
•Digital Volt Meter
•Clamp on Current Meter
•Appropriately Rated Personal Protection Equipment
•Non-metallic small flat blade screwdriver
6.1 Manual Control (Options “B” + “KB”)
The following procedure is used for manual control start-up of the 1P1 Series Control.
1. If the unit has an automatic control signal connected, set it to zero or disconnect it.
2. If the unit has current limit or current trip options, consider setting their adjustment
potentiometers (R45 & R63 or P6 & P8 for K series) to their maximum settings to ensure
they do not interfere with the start up.
3. Set the digital meter to resistance and verify the manual pot is at minimum by ohming
between terminals TB1-3 and -9 for the standard option and TB1-6 & -7 for the K series
option. It should read less than 1 ohm. If not verify the potentiometer connections before
proceeding.
4. Place the Clamp on current meter over the cables connected to the T1 (Load) terminal on
the unit.
5. Set the digital volt meter to AC volts and connect it to the T1 output terminal and the L2
connection on the option card.
6. Energize themain power and verify there is no current or voltage output.
7. Slowly rotate the manual pot clockwise while monitoring the voltage and current.
The units output should begin to gradually rise as the manual pot is turned.
8. Continue to turn the manual pot until it is at maximum.
9. Verify the units output voltage is at maximum and the current reading is as expected.
10. Slowly reduce the manual pot to zero and verify the units output followed.
11. Remove the units power and disconnect the current and volt meters.
12. The unit is now ready to put into service.
Note: If the unit is connected for manual control only and optional current limit is provided, proceed to
current limit start-up procedure (Section 6.3). If operating under manual control only, you have
completed start-up.

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6.2 Automatic Control (Options “B” and “KB”)
The following procedure is used for automatic control start-up of the 1P1 Series Control.
1. Offset and Gain adjustments for the 4-20ma Automatic signal are factory calibrated.
2. If the unit has current limit or current trip options, consider setting their adjustment potentiometers
(R45 & R63 or P6 & P8 for K series) to their maximum settings to ensure they do not interfere
with the start up.
3. Place the current meter around the T1 output lead from the unit.
4. Set the digital volt meter to AC volts and connect it to the T1 output terminal and the L2
connection on the option card.
5. Energize the unit and verify there is no output voltage or current.
6. Increase the automatic signal gradually to 100% (Max) and verify the units output voltage
increases as well and follows the command signal level.
7. Verify the units output voltage is at maximum and the current reading is as expected.
8. Slowly reduce the automatic signal tominimum and verify the unit output followed.
9. Remove the units power and disconnect the current and volt meters.
10. The unit is now ready to put into service.
6.3 Current Limit (Option “C”+ “KC”) Start-up
1. This section assumes the regular start up in sections 6.1 and/or 6.2 have been successfully
completed and the current/volt meters are still connected.
2. Verify the current limit potentiometers R63 or P8 (K series) are set to maximum.
3. Energize the unit.
4. Increase the manual pot or automatic control signal to maximum.
5. Verify the units output is at maximum.
6. Monitor the Voltage and Current meters and slowly decrease the current limit pot setting until the
units output begins to decrease.
7. Continue to decrease the current limit adjustment counter clockwise until the desired current limit
point is reached. This will set a maximum current limit value.
8. If the unit is required to output full voltage, slowly increase the current limit pot until the units
output voltage reaches maximum again. This will set the current limit point just above the full
voltage output value.
9. Adjust the command signal to minimum, then maximum and down to minimum again.
10. Verify the current limit value is correct and the unit performs as needed.

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6.4 Current Trip (Option "E") Start-up
1. This section assumes the regular start up in sections 6.1 and/or 6.2 have been successfully
completed and the current/volt meters are still connected.
2. Verify the Current Trip potentiometer R42 is set fully counter clockwise. (Minimum Sensitivity)
3. Energize the unit
4. Increase the manual or automatic control signal to maximum.
5. Verify the units output is a maximum.
6. Monitor the Voltage and Current meters and slowly turn the Current Trip pot R42 clockwise
(increase sensitivity) until the units output abruptly drops to zero.
7. Momentarily press the Trip Reset button connected between TB1-4 and -8.
8. The unit should switch on. If the unit fails to come on, adjust the Current Trip pot R42 slightly
counter clockwise to decrease the sensitivity and momentarily press the reset button again.
9. Repeat this process until the unit will remain on after a reset.
6.5 Current Trip (Option “KE”) Start-up
1. This section assumes the regular start up in sections 6.1 and/or 6.2 have been successfully
completed and the current/volt meters are still connected.
2. Verify the Current Trip potentiometer P6 is set fully clockwise (Maximum)
3. Select either the Long or Short, Current Trip Reset Time range jumper X1 or X2 (See section 7).
4. Set the Current Trip Reset Time potentiometer P7 to mid-scale.
5. Energize the unit.
6. Increase the manual pot or automatic control signals to maximum.
7. Verify the units output is at maximum.
8. Monitor the Voltage and Current meters and slowly turn the Current Trip Pot (P6) counter
clockwise (decrease) until the units output abruptly drops to zero.
9. Allow the Auto Reset Time to expire while monitoring the output voltage.
10. At the end of the Auto Reset Time the unit will ramp the output voltage to the command level.
11. The unit may trip again during the ramp up. If this occurs increase the Current Trip adjustment a
small amount and allow the Auto Reset Timer to cycle again.
12. Repeat this process until the unit can ramp to 100% power without a Current Trip.
13. Decrease the command signal to minimum.
14. Increase the command signal again to maximum. If the unit trips again, increase the Current Trip
adjustment slightly and repeat the Reset process until the unit can reach full output.