Vulcan-Hart A-130 Manual de usuario

Vulcan®

Furnace

Service Manual

Models:

- - -PD

 - -

- - -

CERAMCO®

SAFETY FIRST

• Don’t bypass the power cord’s ground lead with two-wire extension cords or plug adaptors.

• Don’t disconnect green/yellow safety-earth ground wire that connects the ground lug of the power receptacle to

the chassis ground.

• Don’t plug in the power cord until directed by the installation instructions.

• Don’t repair the furnace unless you are a qualified technician and know how to work with hazardous voltages.

• Don’t locate and operate the furnace in close proximity to combustible materials.

• Observe all W RNING statements. They point out situations that can cause injury or equipment damage.

• Disconnect the power cord before attempting to service.

• It is the user’s responsibility to use only cleaning agents and materials that will not result in hazards to the

equipment or material contained within.

• When replacing the main power supply cord use only a direct equivalent high-temperature cable.

• When replacing the main fuse use only a direct equivalent.

SAFETY

SECTION 1

CIRCUIT DESCRIPTION A-CONTROL

. INTRODUCTION ..........................................-

. CIRCUIT DESCRIPTION ..............................-

.. nalog Meter Readout ...............................-

.. Front Panel Controls ..................................-

.. Muffle Control ...........................................-

.. Power Supply ............................................-

SECTION 2

TROUBLESHOOTING A-CONTROL

. F CTORY REP IR........................................-

. BEFORE YOU ST RT ...................................-

. TROUBLESHOOTING GUIDES ......................-

.. Power Supply............................................-

.. nalog Circuitry.........................................-

.. Triac Drive.................................................-

. TROUBLESHOOTING COMPONENTS ............-

. BLOCK DI GR M.......................................-

. SCHEM TIC ..............................................-

. CONTROL CIRCUIT BO RD..........................-

. WIRING DI GR M .....................................-

SECTION 3

CALIBRATION A-CONTROL

. SCOPE ......................................................-

. F CTORY REP IR........................................-

. DJUSTMENTS...........................................-

.. Door, Lift Drag djustment ........................-

. CIRCUIT BO RD C LIBR TION ...................-

.. Required Test Equipment ..........................-

.. Temperature .............................................-

SECTION 4

CIRCUIT DESCRIPTION 3-STAGE

. INTRODUCTION

. CIRCUIT DESCRIPTION .............................-

.. LCD Display Readout.................................-

.. Front Panel Control ...................................-

.. Muffle Control...........................................-

.. Power Supply............................................-

.. Motor Drive Control...................................-

.. Fan Drive Control ......................................-

SECTION 5

TROUBLESHOOTING 3-STAGE

. F CTORY REP IR........................................-

. BEFORE YOU ST RT ...................................-

.. Isolating a Problem ...................................-

. TROUBLESHOOTING GUIDES .....................-

.. Power Supply ............................................-

.. Microprocessor ........................................-

.. Peripheral Drive ........................................-

.. Motor Drive ...............................................-

.. nalog Circuitry.........................................-

.. Display Board ...........................................-

.. Fan Drive Control ......................................-

. TROUBLESHOOTING COMPONENTS............-

. ERROR CODES...........................................-

. DI GNOSTIC T BLES .................................-

. BLOCK DI GR M.......................................-

. SCHEM TICS ............................................-

. WIRING DI GR M ....................................-

SECTION 6

ADJUSTMENT/CALIBRATION3-STAGE

. SCOPE .....................................................-

. F CTORY REP IR .......................................-

. DJUSTMENT/C LIBR TION .......................-

.. Temperature ............................................-

.. Door, Lift Drag djustment ........................-

. CIRCUIT BO RD C LIBR TION ...................-

.. Required Test Equipment ..........................-

.. Temperature .............................................-

SECTION 7

SER ICE PARTS

. ORDERING INSTRUCTIONS.........................-

. MUFFLE ND THERMOCOUPLE ...................-

. MUFFLE (- PD / IR EXCH)...................-

. C BINET P RTS.........................................-

. DOOR P RTS ............................................-

. -CONTROLLER P RTS ..............................-

. -ST GE & - CONTROLLER P RTS........-

. LIFT MECH NISM P RTS (-PD) ............-

SECTION 8

DISASSEMBLY/REASSEMBLY

. CONTROL DR WER REMOV L.....................-

. TRI C........................................................-

. MEMBR NE SWITCH..................................-

. DISPL Y PCB ............................................-

. -CONTROL PCB .......................................-

.  ST GE CONTROL PCB .............................-

. DOOR SSEMBLY/ DJUSTMENT ................-

. HE TING PL TES.......................................-

. MUFFLE REPL CEMENT........................ .....-

. THERMOCOUPLE ( -Control) .....................-

. THERMOCOUPLE ( ST GE) .......................-

. MUFFLE REPL CEMENT(- PD)........ ....-

. THERMOCOUPLE (-PD) ......................-

. POWER SWITCH .......................................-

. POWER DOOR REPL CEMENT ...................-

TABLE OF CONTENTS

1 –1

SECTION 1 - CIRCUIT DESCRIPTION - A-CONTROL

1.1 INTRODUCTION

The purpose of this section is to familiarize the user or

service personnel with the circuit level operation of the

VULC N. This knowledge is necessary to aid in trou-

bleshooting of a unit's failure and may also allow the

user to gain greater insight into the VULC N’s versatility

for particular applications. detailed description is

given for the following circuit functions:

• nalog Meter Readout

• Front Panel Controls

• Muffle Control

• Power Supply

1.2 CIRCUIT DESCRIPTION

1.2.1 ANALOG METER READOUT

The Type K thermocouple which extends from the back

of the muffle is directly connected to an analog meter

which provides the operator with the present muffle

temperature. The yellow lead of the thermocouple is

connected to the + input of the meter.

1.2.2 FRONT PANEL CONTROLS

The power on/off switch provides C line voltage to the

furnace if the door switch is closed, while the setpoint

potentiometer (K) provides the electronics with a

reference voltage which determines the final muffle

temperature.

1.2.3 MUFFLE CONTROL

The muffle is controlled by means of a triac. This muffle

triac may be activated anytime when the C cycle goes

through zero, and once activated it will only be opened

again when the C sine wave passes through 

volts.The triac is controlled by a Zero Voltage Switch

(integrated circuit U) and is configured as a

proportional controller.Trigger pulses are generated

when the comparator detects Vpin is above the Vref.

The sensed temperature from the amplified

thermocouple signal is then lower than the set value of

RP. s Vpin is near in value of Vref, a proportional

control takes over, i. e. power is delivered by bursts to

the load.

To slow down the heatup time of the muffle (RP set

clockwise and muffle is at low temperature) a rate

control potentiometer (RP) has been added to the

circuitry. sawtooth signal from pin of U is compared

with a fixed reference voltage which can be set by RP.

s the sawtooth voltage exceeds the value of the fixed

reference voltage, amplifier U produces a negative

output which in turn increases the thermocouple signal

output from U and Vpin of U and is now more

negative than Vref, thus the triac output pulses stop.

1.2.4 POWER SUPPLY

The rectified supply current (D) is zener regulated to

.V and biased by dropping resistors R, R.

The positive voltage to U and U is provided by a .V

zener diode D.

NOTES:

________________________________________________

Load Current - Proportional Control

2 –1

2.1 FACTORY REPAIR

DENTSPLY Ceramco maintains a factory repair

department for those customers not possessing the

necessary personnel or test equipment to maintain the

VULC N. If a unit is returned to the factory for

calibration or repair, a detailed description of the

specific problem should be attached to minimize

turnaround time. Call factory for PR number before

shipping at ---.

2.2 BEFORE YOU START

Since no troubleshooting guide can possibly cover all

the potential problems, the aim of this guide is to give a

methodology which, if applied consistently, will lead to

the problem area. Therefore , it is necessary to

familiarize yourself with the VULC N by reviewing the

functional description in conjunction with the

schematic. Successful troubleshooting depends upon

understanding the circuit operation.

WARNING:

With covers removed, dangerous voltage points may

be exposed. Contact with any of these points could

cause serious injury.

2.3 TROUBLESHOOTING GUIDES

WARNING:

When measuring voltages use battery operated test

equipment unless an isolation transformer is

connected between circuit input and C line.

2.3.1 POWER SUPPLY

Rectifier diodes D and D convert the C line voltage to

a DC voltage, while resistors R, R reduce the current

flow thru the .V internal zener diode of U and the

.V external zener diode D. Capacitors C and C filter

the rectified voltages. Most of the circuit's current

consumption is taken up by the triac gate drive.

2.3.2 ANALOG CIRCUITRY

The thermocouple voltage which ranges from -mV

(°C - °C) is multiplied by amplifier U

approximately  times (depending on the setting of

potentiometer RP) and added to the negative setpoint

voltage from RP. sawtooth voltage signal is

generated by U from a constant current source

charging capacitor C. The value of C determines the

burst period of the triac output (typically  seconds).

The triac gate output pulse current is about m . The

triac is triggered in quadrants II and III. Synchronization

is provided by resistor R. Its value determines the

trigger pulse length.

2.3.3 TRIAC DRI E

current pulse from U pin  of about m will turn

on the gate of the muffle triac which in turn will then

carry the full load current. The voltage across the triac

is now at - Vac. In order to comply with norms limiting

the frequency at which a kW size load may be connected

to the main line (fluorescent tubes "flickering") a

proportional temperature control is provided by means

of burst firing the triac.

NOTES:

________________________________________________

2.4 TROUBLESHOOTING COMPONENTS

2.4.1 DIODE

diode (except a zener) is defective if there is greater

than  Vdc (typically . Vdc) forward voltage across it.

2.4.2 OPERATIONAL AMPLIFIER

Generally, the “+” and “-” inputs of an operational

amplifier will have less than  mV voltage difference

when operating under normal conditions. If the output

voltage stays at maximum positive (typically / of the

supply voltage), the “+” input voltage should be more

positive than the “-” input voltage. If the output voltage

stays at minimum (typically - mV), the “-” input

voltage should be more positive than the “+” input

voltage.

2.4.3 TRIAC

The gate to power line return voltage under load

measures typically - Vac, while the MT to return

voltage measures between .-. Vac. triac without

connections and no power applied can be checked for a

go-no go condition with an ohmmeter. The gate to MT

resistance for a power triac (- ) should be between

 and  ohms; there should be infinite resistance

between MT and MT.

2.4.4 CAPACITOR

Shorted capacitors have V across their terminals.

Open capacitors can be located by using a good capaci-

tor connected in parallel with the capacitor under test

and observing the resulting effect.

SECTION 2 - TROUBLESHOOTING - A-CONTROL

2 –2

SECTION 2 - TROUBLESHOOTING - A-CONTROL

Leaking capacitors will often have a decreased voltage

across their terminals.

NOTES:

________________________________________________

2 –3

SECTION 2 - TROUBLESHOOTING - A-CONTROL

2.5 BLOCK DIAGRAM

Power Supply

D,C,R

/V

/Hz

Line

Return Cabinet

+.V -.V

Set Point Pot

Rate Control Pot

mplifier U

Comparator,

Power Supply,

Triac Driver

U

Thermocouple

Power Triac

 , V

Feedback Muffle

2.6 SCHEMATIC

2 –4

SECTION 2 - TROUBLESHOOTING - A-CONTROL

2 –5

SECTION 2 - TROUBLESHOOTING - A-CONTROL

2.7 CONTROL CIRCUIT BOARD

Rate Control Temperature Meter

Connection Triac Gate

Muffle

Connections

Setpoint

Potentiometer

Thermocouple

mplifier Proportional Control iC

2 –6

SECTION 2 - TROUBLESHOOTING - A-CONTROL

2.8 WIRING DIAGRAM

V

LINE CORD

V

RECEPT CLE

NOTE:  - V,

LINE CORD

V LINE

CORD

WHT

BLK

WHT/BLK

ORN

RED

YELL

G TE

BLK

WHT

GRN/YELL

C BINET

GND

V

-

V HOOK UP

HE TING

PL TE

RI C HE TSINK

TRI C

RED

P

P P

C

C MT

MT

T N

P

DDOOR S FETY

SWITCH

THERMOCOUPLE

N LOG P NEL METER

SETPOINT DJUST

POWER SWITCH

REL Y FOR - ONLY

TOP

TERMIN LS

ROUTE LL MUFFLE

WIRES THRU HERE

CONTROL

DR WER

GND

V HOOK

UP ND



MUFFLE

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