Emerson CVS Hardwired Constant Voltage Transformers User Manual download pdf

Introduction

This operating and service manual has been prepared to ensure that your

Sola/Hevi-Duty Constant Voltage Transformer can

be operated and serviced with minimal effort and

involvement. This manual covers Sola/Hevi-Duty

Constant Voltage Sinusoidal (CVS) Transformers.

Installation - Mechanical Position

All stock sizes with end housings are intended to be

mounted with the silk-screened this side up legend

facing upwards. This will place the ventilated capacitor

compartment downward, thus providing cooler

operation of the capacitor(s). However, all units will

give satisfactory performance if mounted in a horizontal

position. In either case, the unit should be mounted in

an area where it is unlikely that anyone will come into

contact with the core surface of the unit.

Mounting Considerations

If a unit is to be wall mounted, the mounting hardware should be sized as in

Table 1 below. All mounting holes provided must be used

Table 1: Mounting Screw/Bolt Sizing

Figure 1: Mounting Holes and Dimensions

Installation – Electrical

On 60VA or smaller units, screw-type lugs in the outlet box are marked “input”

and “output”, and no connection diagram is necessary. Units rated 120 to

15000 VA are provided with multiple inputs for any one, two, three, or four

different line voltages, and some have provision for three-wire output. With

all units, a connection diagram is attached to the inside lid of the box cover, or

inserted in the outlet box. Figure 2 shows typical connections for –8 models,

and Figure 3 shows multiple input connections for all other models. Figure 4

shows the output connections for all models.

Figure 2: Electrical Connections for -8 models

Input & Output Connections – All except 250 VA

Input Connections - 250 VA Only

*Note: The entire load up to the rated capacity of the unit can be drawn from either half of

the 240 volt winding. It is not necessary to divide or balance the load.

Table 3: Recommended Wire Sizes and Fusing

* Leads in the wiring department must be sleeved with 105

C sleeving.

Figure 4. Three Phase Connections

A: Isolated, Single Phase Loads

B: Separate, Single Phase Loads in Grounded Wye

Multiple Operation

Two CVS transformers with the same rating may be connected with their

inputs and outputs in parallel. The regulating action will usually be excellent

although the standard ±1% cannot be guaranteed. Series connection of either

input or output is not recommended.

Use With Rectiﬁer Loads

The ratio of crest to rms values is approximately 1.3 at rated load, and slightly

lower at fractional loads. This factor must be considered when all or a portion

of the voltage is rectiﬁed. The rectiﬁed voltage will now be 10 – 15% lower

than if connected directly to a sinewave source.

Operation With Motor Loads

Because of the current limiting effect described later, special attention should

be given to motor applications. In general, the CVS must have a load rating

nearly equal to the maximum power drawn during the starting cycle. This may

run from two to eight times the normal running rating of the motor. In doubtful

cases, it is advisable to measure the actual starting current.

Cascade Operation

For applications requiring close regulation, two CVS transformers may

be operated in “cascade”. The output of the combination will show little or

no detectable change arising from supply line variations of up to ±15%.

However, the combined units will still be frequency sensitive (as discussed

under Effect of Frequency, page 15). Since even good power systems may

vary in frequency by 0.1% or more, the output of a Sola/Hevi-Duty cascade

combination may vary by up to 0.25% from this cause alone. In actual

practice, then, a cascade combination is highly recommended for special

applications requiring regulation in the general region of ±0.25%. If the

tandem setup is to be operated at near full rating, then the Type CVS “driver”

unit should be one standard size larger than the driven unit, in order to

overcome the losses in the latter.

Outline A Outline B Outline C

All Except 250 VA250 VA only

Constant Voltage Sinusoidal Transformers

Operating and Service Manual

Figure 3: Electrical Connections for Non-8 models

Note: Secondaries are not grounded. Ground X2 per Code.

Rated VA of Regulator Min. Diameter of Steel Mounting Screw

30-120 #10 Machine Screws

250 1/4” bolts

500 to 1000 5/16” bolts

1500 to 10000 3/8” bolts

15000 1/2” bolts

All ratings depend on natural draft air circulation for cooling. They should not

be mounted in conﬁned or enclosed spaces unless special provisions have

been made for ventilation. Technical Services is available for assistance in

doubtful situations (see note on Operating Temperature). Table 2 and Figure 1

show model number with their weight and physical dimensions

Table 2: CVS Weights and Physical Dimensions, 60 Hz Single Phase

Catalog

Number

Outline

Drawing

Dimensions

Approx.

Shipping

Weight (lbs)

(in)

30 23-13-030-2 A 6.12 5.19 3.47 4.00 3.50 3.00 1.75 .22 x .59 7

60 23-13-060-2 A 6.94 5.19 3.47 4.00 3.50 3.00 1.75 .22 x .59 9

120 23-22-112-2 A 8.12 5.19 3.47 4.00 3.50 3.00 2.44 .22 x .59 13

250 23-23-125-8 A 10.50 7.56 4.75 5.63 4.75 4.12 3.03 .39 x .69 28

500 23-23-150-8 A 13.00 6.50 8.12 9.00 8.12 5.62 3.06 .38 x .81 37

1000 23-23-210-8 A 17.25 6.81 8.12 9.00 8.12 5.62 5.25 .38 x .81 63

2000 23-23-220-8 B 17.58 9.44 10.56 12.75 11.75 3.88 5.19 .44 x .69 109

3000 23-23-230-8 B 18.96 9.44 10.56 12.75 11.75 5.25 5.19 .44 x .69 142

5000 23-23-250-8 B 28.53 9.44 10.56 12.75 11.75 8.25 8.88 .44 x .69 222

7500 23-28-275-6 C 26.91 9.27 23.55 25.81 24.81 6.62 8.88 .44 x .69 365

Three-Phase Power Wiring

If operation from a three-phase source is required, three hardwired regulators

may be wired in delta as shown in Figure 4.

Other Considerations

It is desirable to have a switch in the input circuitry for turning off power to

the unit when it is not in use. While all CVS transformers are designed for

continuous duty, they draw appreciable current regardless of output loading.

The outputs of all Sola/Hevi-Duty standard CVS transformers are isolated

from the input lines. Voltage generated by internal leakage currents will occur

with respect to ground. This can have undesirable effects in many pieces of

electronic equipment. Therefore, if Figure 4 circuit “B” is used, it is suggested

that the installer remove X2 grounding on –8 units, then connect all X2 from

each phase to one location and ground at that location only. This is not

required for circuit “A”. This will not affect regulation or the ability to reject

power line noise or transients.

Any three stock units having a tap for 190-260 input connections may be

connected in delta to a 240-volt, three-phase power supply. Those units

equipped with primary tap for 175-235 volts may also be connected in delta

to a 208-volt supply. (Terminals to be used are identiﬁed on the connection

diagram located on the inside face of the outlet box cover.)

All stock production, harmonic-free units now have uniform terminal polarity.

This eliminates the need for “phasing out” either input or output connections.

Output must serve three, independent, single-phase loads of the same total

volt-ampere rating. Connections should be made in one of two ways shown

in Figure 4.

Use With Switchmode Power Supplies

If a CVS transformer is used as a source for a switchmode power supply, a

slight amount of ringing may be noticed on the sinewave output of the CVS at

half cycle intervals for a short duration. This ringing occurs at the point when

the switchmode power supply current demand drops to zero. The ringing

should not be a cause for concern since it is of relatively low magnitude and

frequency. The CVS has been tested with a variety of switchmode power

supplies and it has been determined that the ringing never affects the D

outputs, nor has it been found to degrade the components of any switchmode

power supply.

Volts Input Jumper Volts Output

95-130 H1-H2

(H1 + H3 + H6 + H8) (H2 + H5 +

H7 + H10)

120

X1 – X2 or

X2 – X3

175-235 H1-H4

(H2 + H3) (H7 + H8) (H1 + H6)

(H4 + H9)

240 X1 – X3

190-260 H1-H5

(H2 + H3) (H7 + H8) (H1 + H6)

(H5 + H10)

380-520 H1-H10 (H2 + H3) (H5 + H6) (H7 + H8)

Volts Input Jumper Volts Output

95-130 H1-H2

(H1 + H3 + H5 + H7)

(H2 + H4 + H6 + H8)

120 X1 – X2

190-260 H1-H4

(H2 + H3) (H6 + H7)

(H1 + H5) (H4 + H8)

380-520 H1-H8

(H2 + H3) (H4 + H5)

(H6 + H7)

Primary Voltage

Interconnect

Connect

Lines To

30 & 60 VA 120 VA 7500 VA

120 N/A N/A

Note: H3 & H4

are not used

H1 & H2

N/A 120 240

H1 to H3

H2 to H4

H1 & H4

N/A 240 480 H2 to H3 H1 & H4

Secondary Voltage

Interconnect

Connect

Lines To

30 & 60 VA 120 VA 7500 VA

120 120 N/A X1 & X2

N/A N/A 120

X1 & X2 or

H3 & X2

N/A N/A 240 X1 & X3

CVS Input Output

VA Rating

Rated

Volts

Req. Circuit

Protection

(In Amps,)

Min. Gauge

90°C Wire

Rated

Volts

Min. Gauge

90°C Wire

95-130

14 120 14

60 2

120

95-130

3 14 120 14

190-260

250

95-130 6

14 120 14190-260 3

380-520 1

500

95-130 10

120

208

240

175-235 6

190-260 6

380-520 3

1000

95-130 15

120

208

240

175-235 10

190-260 10

380-520 6

2000

95-130 30 10

120

208

240

175-235 20 12

190-260 15 14

380-520 10 14

3000

95-130 45 8

120

208

240

175-235 25 10

190-260 25 10

380-520 15 14

5000

95-130 80 4

120

208

240

175-235 40 8

190-260 40 8

380-520 20 12

7500

190-260 60 6

120

208

240

380-520 30 10 8

321

654

7 98

1 2

Operating and Service Manual 1

Summary of Contents

Page 1 - Operating and Service Manual

IntroductionThis operating and service manual has been prepared to ensure that your Sola/Hevi-Duty Constant Voltage Transformer can be operated and se

Page 2

Sola/Hevi-Duty(800) 377-4384www.solahd.comPhysical Characteristics of OperationOperating TemperatureStandard units are designed to operate in ambient

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Summary of Contents

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