Download Class 8430, Type MPD Phase Failure Relay

65013-008-89A
08/2002
Raleigh, NC, USA
Instruction Bulletin
Replaces 65013-008-89 6/86
Phase Failure Relay
Class 8430 Type MPD
Retain for future use.
INTRODUCTION
The Class 8430 Type MPD phase failure relay is a three-phase voltage
sensing device that trips on phase loss, phase reversal, voltage unbalance,
or undervoltage. Voltage unbalance trips the device when any voltage drops
10% below the average. Undervoltage is externally adjustable from
75–100% of the rated voltage. The LED on the front of the device lights
when the device is energized.
Two 600 V Form C output contacts are standard on all devices. Table 1
shows the input voltage and input burden for each device type.
Table 1:
Device Types
Type
Input Voltage (60 Hz, 3 phase)
Input Burden
MPDV20
120 Vac
5.0 VA maximum
MPDV24
240 Vac
5.5 VA maximum
MPDV29
480 Vac
6.5 VA maximum
MPDV32
600 Vac
7.0 VA maximum
DANGER
WARNING
HAZARDOUS VOLTAGE
UNEXPECTED RESTART
Turn off all power supplying this equipment
before working on it.
• This phase failure relay has auto reset.
Failure to follow this instruction will result in
death or serious injury.
Failure to follow this instruction can result in death or serious injury.
MOUNTING
• Do not use a maintained contact device to control the motor starter.
For surface mounting, use two 8-32 screws placed 3.125 in. (79 mm) apart.
Mount adjacent devices on 2.25 in. (57 mm) centers. Class 8501 TYPE X®
mounting track can be used.
Terminals accept one 18–14 AWG copper wire. Use wire with 75 °C or
higher insulation. Torque to 7–9 lb-in (0.8–1.0 N•m).
Figure 1:
Terminal Connections
Figure 2:
Approximate Dimensions
❇ Shows the position
of the output contacts
when the relay is
de-energized.
© 1986–2002 Schneider Electric All Rights Reserved
1
Phase Failure Relay, Class 8430 Type MPD
Instruction Bulletin
Table 2:
65013-008-89A
08/2002
Temperature Ratings
Table 3:
Temperature, °F (°C)
Operating Ambient Air
Minimum
Maximum
23 (–5)
122 (50)
–4 (–20)
158 (70)
★
Storage
★
The air temperature in the immediate vicinity of the device,
into which the heat of the device dissipates.
OPERATION
Table 4:
Control
Circuit
Voltage
600 V
480 V
240 V
120 V
DPDT
(double pole,
double throw)
AC Ratings
Inductive
Resistive
Make
Break
Make and Break
Thermal
Continuous
3600 VA
3600 VA
3600 VA
3400 VA
360 VA
360 VA
360 VA
340 VA
2.5 A
2.5 A
5A
5A
5A
5A
5A
5A
Upon application of the proper three-phase voltage, the relay energizes
and the LED turns on. When one of the following incorrect conditions
occurs, the LED turns off and the relay de-energizes:
Operating Characteristics
Undervoltage Adjustment Range
120 V
240 V
480 V
600 V
Contacts
Contact Ratings
90–120 V
180–240 V
360–480 V
460–600 V
Pickup Time
Typically 0.1 s when the correct
three-phase voltage is applied
Dropout Time
Typically 3.0 s for any incorrect
voltage condition
Transient Protection
5000 V for 50 µs
•
•
•
Phase loss—Loss of phase A, B, or C
•
Undervoltage—The average of the three voltages is less than the set
level.
Phase reversal—Phase rotation other than A-B-C
Voltage unbalance—Any of the three line voltages is more than 10%
below the average of the three line voltages
The relay remains de-energized and the LED turned off as long as the
improper condition continues. When the condition is corrected, the relay
automatically re-energizes and the LED turns on.
CAUTION
WARNING
UNEXPECTED MOTOR REVERSAL
EXCESSIVE MOTOR BACK-EMF
• All functions of the phase failure relay are
bypassed while the start button is
depressed.
• Do not use load side monitoring if motor
reversal is not required.
High levels of Back-EMF (electromotive force) on larger motors can
supply sufficient voltage to prevent this relay from detecting a phase loss.
• Always use a motor overload protection device.
• Do not use this relay as your only phase loss protection.
Failure to follow this instruction can result in equipment damage.
Unexpected motor reversal can result in
death or serious injury.
CONNECTION DIAGRAMS
Figure 4:
M
∅A
M
∅B
MOTOR
M
∅C
∅A
∅B
L1
STOP
L2
START
OL
∅C
Line Side Monitoring
NOTE: Line side
monitoring does not
protect against high
resistance contacts
on the contactor.
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8001 Highway 64 East
Knightdale, NC 27545
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2
M
∅B
MOTOR
M
∅C
∅A
∅B
L1
STOP
START
M
8430MPD
M
∅A
8430
MPD
L2
∅C
8430
MPD
Load Side Monitoring
8430
MPD
Figure 3:
OL
M
M
Electrical equipment should be installed, operated, serviced, and maintained only by
qualified personnel. No responsibility is assumed by Schneider Electric for any
consequences arising out of the use of this material.
© 1986–2002 Schneider Electric
All Rights Reserved