FUNCTION DESCRIPTIONS
PHASE UNBALANCE
Unbalance occurs in 3 phase systems when single phase loads are added
without regard to voltage effects on the remaining phases. This unbalance in
phase voltage causes excessive motor current producing temperatures in excess
of specifications. The relationship between voltage unbalance and percentage
of temperature rise is approximately the square of the percent voltage
unbalance times two. ie., - % temperature rise = (% unbalance 2 X 2).
Therefore, a 4% voltage unbalance will result in approximately a 32%
increase in winding temperature. The effect of temperature rise is immediate
failure of winding insulation if unbalance is severe as with single phasing. If
unbalance is slight, gradual winding degradation will result in premature
insulation failure. The APMR will detect slight unbalances that thermal and
magnetic devices usually miss.
PHASE LOSS
Phase Loss is an extreme case of unbalance known as “single phasing”
where a total loss of one of the phases occurs. During this condition the motor
will continue to run and the full current is drawn from the remaining phases.
Unless the motor is lightly loaded motor failure will occur. The APMR will
detect Phase Loss even with regenerated voltages present.
PHASE REVERSAL
Reversing any two of the three phases will cause a motor to rotate opposite
the intended direction causing damage to machinery. Reversal can occur during
maintenance of distribution systems. The APMR will detect Phase Reversal
regardless of load conditions.
UNDERVOLTAGE
Undervoltage can occur during Brownouts, excessive system loading and
motor startups. An undervoltage Time Delay is provided with the undervoltage
detection to eliminate false tripping during startups when a motor draws many
times its operating current.
EMC INSTALLATION GUIDELINES
Although this unit is designed with a high degree of immunity to
ElectroMagnetic Interference (EMI), proper installation and wiring methods
must be followed to ensure compatibility in each application. The type of the
electrical noise, source or coupling method into the unit may be different for
various installations. Cable length, routing and shield termination are very
important and can mean the difference between a successful or a troublesome
installation. Listed below are some EMC guidelines for successful installation
in an industrial environment.
1. The unit should be mounted in a metal enclosure, that is properly connected
to protective earth.
a. If the bezel is exposed to high Electro-Static Discharge (ESD) levels,
above 4 Kv, it should be connected to protective earth. This can be done
by making sure the metal bezel makes proper contact to the panel cut-out
or connecting the bezel screw with a spade terminal and wire to
protective earth.
2. Use shielded (screened) cables for all Signal and Control inputs. The shield
(screen) pigtail connection should be made as short as possible. The
connection point for the shield depends somewhat upon the application.
Listed below are the recommended methods of connecting the shield, in
order of their effectiveness.
a. Connect the shield only at the panel where the unit is mounted to earth
ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is above 1 MHz.
c. Connect the shield to common of the unit and leave the other end of the
shield unconnected and insulated from earth ground.
3. Never run Signal or Control cables in the same conduit or raceway with AC
power lines, conductors feeding motors, solenoids, SCR controls, and
heaters, etc. The cables should be run in metal conduit that is properly
grounded. This is especially useful in applications where cable runs are long
and portable two-way radios are used in close proximity or if the installation
is near a commercial radio transmitter.
4. Signal or Control cables within an enclosure should be routed as far away as
possible from contactors, control relays, transformers, and other noisy
components.
2
5. In extremely high EMI environments, the use of external EMI suppression
devices, such as ferrite suppression cores, is effective. Install them on Signal
and Control cables as close to the unit as possible. Loop the cable through the
core several times or use multiple cores on each cable for additional protection.
Install line filters on the power input cable to the unit to suppress power line
interference. Install them near the power entry point of the enclosure. The
following EMI suppression devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC #FCOR0000)
TDK # ZCAT3035-1330A
Steward #28B2029-0A0
Line Filters for input power cables:
Schaffner # FN610-1/07 (RLC #LFIL0000)
Schaffner # FN670-1.8/07
Corcom #1VB3
Corcom #1VR3
Note: Reference manufacturer ’s instructions when installing a line filter.
6. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
WIRING CONNECTIONS
All conductors should meet voltage
and current ratings for each terminal.
Also, cabling should conform to
appropriate standards of good
installation, local codes and regulations.
It is recommended that power supplied to
the unit be protected by a fuse or circuit
breaker. When wiring the unit, use the
number on the label to identify the
position number with the proper
function. Strip wire, leaving
approximately 1/4" (6mm) of bare wire
exposed. Insert the wire into the terminal,
and tighten the screw until the wire is
clamped tightly.
相关PDF资料
APS INT2012 INVERTER 2000W 230VAC OUT
APS1012 INVERTR 1000W 12VDC 2OUT W/CHRGR
APS1250 INVERTER W/BATT CHARGE 1250W
APS1524 INVERTER 1500W HARDWIRE OUTPUT
APS2424 INVERTR 2400W 24VDC W/CHRGR
APS2448UL INVERTER 2400W 48VDC OR 120VAC
APS3636VR INVERTER 3600W 36VDC OR 120VAC
APS512 INVERTER 500W 12VDC 2OUT W/CHRGR
相关代理商/技术参数
APMR0086 制造商:Red Lion Controls 功能描述:SIGNAL CONDIT MOD, 3 PH FAULT DET 380V 制造商:Red Lion Controls 功能描述:3 PHASE FAULT DETECTOR 380VAC
APMR0096 制造商:Red Lion Controls 功能描述:Relay, Analog Phase Mod, 480 制造商:Red Lion Controls 功能描述:3 PHASE FAULT DETECTOR 480VAC
APMS-10GRCF 制造商:Honeywell / Clarostat 功能描述:Wash Process Sensor 3-Pin 制造商:Honeywell Sensing and Control 功能描述:Magnetic Sensors 制造商:Honeywell Sensing and Control 功能描述:Wash Process Sensor 3-Pin
APMS-10GRCF-18 制造商:Honeywell / Clarostat 功能描述:Wash Process Sensor 3-Pin 制造商:Honeywell Sensing and Control 功能描述:Magnetic Sensors 制造商:Honeywell Sensing and Control 功能描述:Wash Process Sensor 3-Pin
APMS-10GRCF-50 制造商:Honeywell / Clarostat 功能描述:Wash Process Sensor 3-Pin 制造商:Honeywell Sensing and Control 功能描述:Magnetic Sensors 制造商:Honeywell Sensing and Control 功能描述:Wash Process Sensor 3-Pin
APMS-10GRCF-KIT 制造商:Honeywell Sensing and Control 功能描述:Wash Process Sensor 3-Pin
AP-MSD01GISI-T 功能描述:Memory Card microSD? 1GB SLC 制造商:apacer memory america 系列:- 零件状态:有效 存储器类型:microSD? 存储容量:1GB 速度:- 技术:SLC 工作温度:-40°C ~ 85°C 标准包装:1
AP-MSD02GIDI-T 功能描述:Memory Card microSD? 2GB SLC 制造商:apacer memory america 系列:- 零件状态:有效 存储器类型:microSD? 存储容量:2GB 速度:- 技术:SLC 工作温度:-40°C ~ 85°C 标准包装:1