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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. Current Transformers Available from SymCom, Inc. (See Table Below) Typical Three Phase Submersible Motors OC - Over Current Trip Point (Overload) UC Trip Point to 5.00 Amps (0.02) UB - Current Unbalance Trip Point 2.0 to 50.0 sec. (0.2) for all faults except phasing - see inverse time curve for OC trip delay RD1 - Restart Delay on Power Up RD2 - Restart Delay After All Faults except Under Current (Motor Cool Down Timer) RD3 - Restart Delay after Under Current #RF - Number of Restarts after All Faults 0, 1, 2, 3, 4, or Unlimited = "999" 480VA @ 240VAC (Mod. 115, 230) 470VA @ 600VAC (Mod. 460, 575) Transient Protection (Internal) (all content is the responsibility of the poster) |
L-burnett@oklahomaselltoday.com (Lorraine Burnett) for more information. All emails will be forwarded to the poster's actual email address.