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305C1

更新时间： 2024-09-12 21:55:15
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威世 - VISHAY 电动机起动
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PTCR Motor Start Packages PSC Single Phase Motor Start Assist

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305C1 数据手册

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305C Series  
Vishay Cera-Mite  
PTCR Motor Start Packages  
PSC Single Phase Motor Start Assist  
• ECONOMICAL SOLID STATE TORQUE ASSIST FOR HEAT PUMPS, ROOM AIR, COMMERCIAL  
AND RESIDENTIAL AIR CONDITIONING AND REFRIGERATION SYSTEMS  
Positive Temperature Coefficient Resistors have been  
used for many years in millions of HVAC applications to  
provide starting torque assistance to Permanent Split  
Capacitor (PSC) single phase compressor motors.  
Safety Agency Recognition  
Vishay Cera-Mite motor start PTCRs are recognized by  
Underwriter Laboratories file E97640 in accordance with  
Standard forThermistorType Devices UL 1434;and Canadian  
Standards C22.2 No. 0-1991.  
Sizes are available to cover the full range of 120/240 volt  
PSC compressor motors.  
RELATIVE COMPARISON OF VARIOUS MOTOR STARTING METHODS  
Three methods have historically been employed to generate  
starting torque for PSC motors. All are well-proven technolo-  
gies and may be compared relative to one another based  
upon categories shown below.  
The importance of each category is dependent upon the  
motor application and industry sector.  
In general, if the PTCR starter produces sufficient starting  
torque, it is considered the simplest and most economical  
choice.  
Table 1  
MECHANICAL  
ELECTRICAL  
FINANCIAL  
PANEL SENSITIVE TO ACCELERATION ACCELERATION RESET  
INVENTORY  
MIX  
STARTING  
METHOD  
EASE OF  
SPACE MOUNTING  
TORQUE  
PRODUCED  
(SWITCH)  
TIME  
TIME  
EMI/RFI  
PURCHASED  
WIRING REQUIRED DIRECTION  
REQUIRED GENERATED TECHNOLOGY REQUIRED RELIABILITY COST  
PTCR Starter Simple Lowest  
2 Wire  
Start Cap with Moderate Medium  
PTCR Acting as 2 or 3  
No  
Lowest  
Fixed  
Fixed  
3 - 5  
Minutes  
2 - 5  
No  
No  
Solid State  
Solid State  
Lowest  
Highest  
Medium  
Lowest  
Yes  
Medium  
Medium  
Medium  
Minutes  
A Current Relay  
Wire  
Start Cap used Difficult Highest  
With Potential or 4 or 5  
Yes  
Highest  
Variable  
Based on  
None  
Yes  
Electro  
Mechanical  
Highest  
Lowest  
Highest  
Current Relay  
Wire  
Motor Speed  
SIMPLIFIED PTCR STARTING DIAGRAM  
Start Sequence. When starting the  
compressor, contactor (M) closes;  
the PTCR, which is at low resistance,  
provides starting current to the motor’s  
auxiliary winding. After time delay (t),  
the current passing through the PTCR  
causes it to heat and “switch” to a very  
high resistance.At this point the motor is  
Restart. It is important to provide  
time between motor starts to allow  
the PTCR to cool to near its initial  
temperature. This time is usually  
3 to 5 minutes and is determined by  
the thermostat (THERM) or separate  
time-delay relay (TR). Attempts to  
restart in less time may be successful  
depending on compressor equaliza-  
tion, line voltage, temperature, and  
other conditions. If the motor were to  
stall in a locked-rotor state, overload  
device (PD or TS) would open the  
line and a further time delay would  
occur until the motor overload is  
reset. Motor start PTCRs are applied  
to compressors having means to  
equalize pressure during shutdown.  
TYPICAL PTCR CHARACTERISTICS  
AS A MOTOR START DEVICE  
Fig T-3  
CURRENT  
20.0  
10,000  
up to speed and the run capacitor (C  
)
R
PTCR  
Current  
(Amperes)  
determines the current in the auxiliary  
winding. The PTCR remains hot  
and at high resistance as long  
as voltage remains on the circuit.  
When contactor (M) opens, shutting  
off voltage to the compressor,  
the PTCR cools to its initial low  
resistance and is again ready to provide  
torque assist on the next startup.  
1,000  
100  
Switch Time (t)  
RESISTANCE  
0.02  
10  
50  
PTCR Temperature °C  
150  
100  
20.0  
Fig T-2  
L1  
PD  
M
Protective  
Device  
PSC  
MOTOR  
TS  
THERM  
Internal  
Motor  
Winding  
Overtemp.  
Switch  
MAIN  
TR  
M
AC Line  
120 or 240  
VOLTS AC  
Optional OFF  
Time Delay TR  
Relay  
CR  
AUX.  
M
Protective  
Device  
PTCR  
Low Voltage Control Transformers Not Shown  
M
L 2  
Document Number: 23086  
Revision 14-May-02  
www.vishay.com  
3
ceramite.support@vishay.com  
123456

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