Allen-Bradley 3P-FCOVPD-B-FA, 23P-FCOVPD-B-FB, 23P-FC-RB200, 23P-FC-RB100, 23P-FC-RB300 Installation Instructions Manual

Installation Instructions

Original Instructions

PowerFlex DC Field Controller Overvoltage Protection Device

Catalog Numbers 23P-FCOVPD-B-FA, 23P-FCOVPD-B-FB, 23P-FCOVPD-D-FA, 23P-FCOVPD-D-FB, 23P-FC-RB100, 23P-FC-RB200, 23P-FC-RB300, 23P-FC-RB400,
23P-FC-RB500

Topi c Pag e

Product Advisories 2

Require d Tools an d Hardware 2

System Wiring Dia gram 2

Dampening Resistor 3

Optional External Discharge Resistor 3

Volt age Cla mp The rmost at 4

Voltage Clamp Nameplate Data 4

Product Dimensions and Weights 5

Minimum Mounting Clearances 8

Install the Voltage Clamp and Dampening Resistor 9

Additional Resources 11

The overvoltage protection device (voltage clamp) helps to provide protection against overvoltage for the PowerFlex® DC field controller when
used with a highly inductive load. An overvoltage can occur when the AC supply voltage is turned off before the field controller is disabled. The
resulting overvoltage can damage the field controller.

The voltage clamp (cat. no. 23P-FCOVPD-x-Fx) is composed of a pair of Silicon Controlled Rectifier (SCR) modules and a circuit board. The
circuit board detects the load voltage level. When a potentially damaging voltage level is detected, the voltage clamp activates the appropriate SCR,
based on the direct of current flow. The SCRs conduct the excess current and allow the resistance in the motor field to gradually decay. The voltage
clamp must not be used to discharge inductive loads routinely. The voltage clamp requires approximately 30 minutes to dissipate the energy from an
overvoltage condition before power can be reapplied to the device.

A dampening resistor (RB) must be installed in combination with the voltage clamp. The dampening resistor is required to dampen the overvoltage
that results from undershooting holding current when the voltage clamp SCR stops conduction. Dampening resistor kits (cat. no. 23P-FC-RBn00)
must be purchased separately. See Dampening Resistor on page 3

The voltage clamp enclosure is rated IP20 and the power terminals are rated IP00. The dampening resistor terminals are rated IP00. Therefore,
these devices must be enclosed in a protective enclosure or appropriate guards must be provided to help protect against an electric shock and/or
burn hazard.

for details.

PowerFlex DC Field Controller Overvoltage Protection Device

U

V

W

C

D

PowerFlex DC

Field Controller

PE

RB

Voltage Clamp

C

D

RD

PE

L

RL

Load

Product Advisories

Qualified Personnel

ATT EN TI ON : Only qualified personnel familiar with DC drives, field controllers, motors and associated machinery should plan or implement the installation,

startup, and subsequent maintenance of the system. Failure to comply can result in personal injury and/or equipment damage.

Personal Safety

ATT EN TI ON : To avoid an electric shock hazard, verify that all power to the connected devices has been removed before you begin installation.

ATT EN TI ON : To avoid an electric shock hazard, the installer must provide guarding to shield exposed electrical equipment against accidental contact. Exposed

electrical components that carry potentially hazardous voltages are identified in this manual. When installing this equipment, consider the design and
placement of guarding to help prevent personal injury or equipment damage.

BURN HAZARD: Hot surfaces can cause severe burns. The dampening resistor assembly becomes hot during operation. To avoid a burn hazard, the installer
must provide guarding to shield exposed electrical equipment against accidental contact. After operation, allow time for the resistor assembly surfaces to cool
before you start maintenance.

Required Tools and Hardware

This table provides a list of customer-supplied tools and hardware that is required to install the voltage clamp.

Tools Hardware Hardware

Nut driver or torque wrench (10 mm, 13 mm, 15 mm).

Flat-nose and hexalobular screwdriver (T30).

M6 screws (8) for voltage clamp and dampening
resistor mounting.

M8 bolt and washer for voltage clamp ground (PE)
terminal.

M6 bolts and washers (2) for device cat. no. 23P-FCOVPD-B-FA and
23P-FCOVPD-D-FA power terminals (C, D).

M10 bolts and washers (2) for device cat. no. 23P-FCOVPD-B-FB and
23P-FCOVPD-D-FB power terminals (C, D).

System Wiring Diagram

This diagram represents the recommended wiring configuration for a PowerFlex DC field controller, voltage clamp, required dampening resistor
(RB), and optional discharge resistor (RD).

2 Rockwell Automation Publication 23PFC-IN002A-EN-P - November 2018

PowerFlex DC Field Controller Overvoltage Protection Device

Dampening Resistor

A dampening resistor (RB) must be installed with the voltage clamp to dampen the overvoltage that results from undershooting holding current
when the SCR stops conduction. Purchase and install the appropriate resistor kit that is listed in the Dampening Resistor (RB) Kits table, or use the
sizing information to install a customer-supplied resistor.

Dampening Resistor Sizing Calculations

The value of resistor RB is determined by the 500 mA SCR holding current at the rectified voltage value. The dielectric strength of resistor RB is at
least double the rectified voltage value and its power loss is two to three times (for margin) the power dissipation that is calculated, considering the
rectified nominal voltage of the load.

Size a customer-supplied discharge resistor (RB) as follows:

RB value = 1.35 * V_line / 500 mA

RB dielectric strength ≥ 2 * 1.35 * V_line

2

RB power = 2 * (V_load)

The available dampening resistor kits are shown in the Dampening Resistor (RB) Kits table. The resistor kits are sized with the value of resistor RB
as a function of V_line with a typical inductive load that is connected to the PowerFlex DC field controller. For most applications, the typical DC
output voltage is approximately 1.08 * V_line. By using the typical DC output voltage value as a guideline, the power dissipation value can be forced
to be a function of the AC input line voltage. Size a dampening resistor (RB) where V_load = 1.08 * V_line:

RB value = 1.35 V_line / 500 mA

RB dielectric strength ≥ 2 * 1.35 * V_line

RB power = 2 * (1.08 * V_line)

(RB power = 2 increases the power dissipation margin.)

/ RB

2

/ RB

Dampening Resistor (RB) Kits

Field Controller AC Input Voltage Range

(Vrms)

60…100V 220 930 23P-FC-RB100

101…200V 390 930 23P-FC-RB200

201…300V 680 930 23P-FC-RB300

301…400V 1000 930 23P-FC-RB400

401…500V 1200 930 23P-FC-RB500

(1) Resistor kits are IP00 / Open Type and must be installed in an enclosure.

RB Resistor Value

Ohms

RB Resistor Size

Watts

RB Resistor Kit Cat. No.

(1)

Optional External Discharge Resistor

An external discharge resistor (RD) must be installed to reduce the load current discharge time if the load τ is greater than the rated operation time,
as calculated in the Calculate the Average Power Dissipation Value for Resistor RD section on page 4. The time constant for the load is calculated

as:

τ = L / R, where L is the load inductance and R is the internal resistance of the load

The addition of resistor RD decreases the discharge time constant: τ = L /(R + RD)

Optional External Discharge Resistor Calculations

Calculate the Resistance Value of Resistor RD

To calculate the resistance value of resistor RD, the inductance and resistance of the existing load must be known. The desired time constant of the
“updated circuit” is expressed as:

τ = L / (R + RD)

Solve for RD.

Rockwell Automation Publication 23PFC-IN002A-EN-P - November 2018 3

PowerFlex DC Field Controller Overvoltage Protection Device

Cat No. 23P-FCOVPD-D-FA

UL Type OPEN/IP20

Rated Voltage : 600 VDC

Max rated current : 120A

MFD, in 2018 on week 20

制造于2018年，第20周

Product of Italy

Rockwell Automation, 1201 S. 2nd St., Milwaukee, WI 53204, USA

Serial Number:

J20A0001

*K20E0013*

IND. CONT.

LISTED

C

R

US

31KF

Series: A

25

Rated Operation Time : 60 sec Rated Recovery Time : 1800 sec

Calculate the Peak Power Rating Value for Resistor RD

Calculate the peak power rating value for RD in watts, where the initial current is equal to the load current.

RD_peak_Power = (I_load)

Solve for RD_peak_Power.

2

* RD

Calculate the Average Power Dissipation Value for Resistor RD

Calculate the average power dissipation for resistor RD.

The initial current, Io, of the discharge circuit is the load current. The load actually consists of an inductance and a resistance in series (though the
only visible object is the load coil).

During the current discharge, the energy that is stored in the magnetic field of the load inductance is dissipated in the internal load resistance and
the external optional added resistor RD.

E = Energy, Joules

P = Power, Watts (Joules/Second)

L = Inductance, Henrys

R = Resistance, Ohms

I = Current, amps

Io = Initial Current, amps

τ = Circuit Time Constant L/R, Seconds

2

E = ½ * L_load * Io

(The initial value of the energy stored load inductance)

τ = L / (RD + R_load)

P_rd = [E / 6 * τ] * [RD / (RD + R_load)]

P_rd = Average power dissipation of resistor RD over six time constants (discharge time of the circuit).

Solve for P_rd.

Voltage Clamp Thermostat

A thermal-trip interlock terminal block (TB1) is provided on the top of the voltage clamp. Use this terminal block to interlock the voltage clamp
with the field controller control circuit. The thermal trip circuit opens when the voltage clamp heat-sink temperature is too high. When the
thermostat is open, the field controller is disabled.

Voltage Clamp Nameplate Data

The voltage clamp contains a data nameplate label on the side of each module. This nameplate identifies the specific catalog number, serial number,
and applicable power data. Include this information when communicating with Rockwell Automation personnel about this product.

EXAMPLE ONLY

4 Rockwell Automation Publication 23PFC-IN002A-EN-P - November 2018