Datasheet

www.symcom.com • 800-843-8848 • fax: [phone]
38
Available Models:
Features:
• Motor acceleration trip delay
• Protects three-phase motors from:
• Overcurrent
• Undercurrent
• Current unbalance
• Rapid cycling
• Single phasing
• Phase reversal
A pprovals:
Specications
520CS-115
The Model 520CS
is a fully-programmable, microcontroller-based,
current-sensing device designed to monitor
3-phase pumps. Unlike the Model 520CP which is
designed to work with motors that have ramp-up
times of 4 seconds or less, the Model 520CS has a
programmable motor acceleration time that can be
set from 0-50 seconds.
Three external current transformers must be
utilized in conjunction with the Model 520CS. The
following nine parameters can be set and viewed
from the 3-digit alphanumeric display: overcurrent
trip point, undercurrent trip point, current
unbalance trip point, trip delay, rapid-cycle timer
(RD1), overload restart delay (RD2), underload
restart delay (RD3), number of starts after a fault and
motor acceleration time. Last fault diagnostic is also
viewable. When a harmful condition is detected, the
MotorSaver’s output relay is deactivated after the
specified trip delay. The output relay reactivates
after the appropriate RD2 or RD3 timer has expired.
Overcurrent, undercurrent and current unbalance
are ignored during the motor acceleration period;
however, if the motor is started on a single-phase
or a reverse-phase condition, the Model 520CS
deactivates its output relay in 0.5 second.
The voltage designation specified is based on the
control circuit voltage of the application.
For more information see:
See Appendix A, page 69, Figure 12 for dimensional
drawing.
See Appendix B, page 77, Figure 34 for typical
wiring diagrams.
RD1 - restart delay on power-up and rapid-cycle timer
RD2 - restart delay after all faults except undercurrent
RD3 - restart delay after undercurrent
Model 520CS
3-phase current monitor, programmable motor acceleration trip delay from 0-50 seconds
Current Monitor
Input Characteristics
Control Voltage ..................................100-130VAC
Frequency .......................................50*/60Hz
Functional Characteristics
Maximum Full Scale Current .......................5 Amps (max.)
Fixed Operating Points
Reverse-Phase Trip Delay ...........................0.5 second
Single-Phase Trip Delay ............................0.5 second
Output Characteristics
Output Contact Rating (SPDT)
Pilot Duty ........................................480VA at 240VAC
General Purpose ...................................10A
General Characteristics
Temperature Range ................................0
° to 70ºC (32 ° to 158°F)
Repeat Accuracy Trip Point .........................±2%
Repeat Accuracy Timing ............................±25%, ±1 second
Maximum Input Power .............................5 W
Transient Protection (Internal) .......................2500V for 10 ms
Safety Marks
UL ...............................................UL508
(File #E68520)
CSA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C22.2 (File #46510)
Dimensions .......................................8.25” H x 5.25” W x 3.25” D
(209.55 x 133.35 x 82.55mm)
Weight ...........................................
2.2 lbs. (35.2 oz., 997.9 g)
Mounting Method ................................. Four #10 or #12 screws (3/4”-1” in length)
*Note: 50Hz will increase all delay timers by 20%
Requires external current transformers (sold separately).
CATALOG_SYMCOM_2014.indd 38 6/10/14 11:06 AM