2008-276 D - Laserfiche WebLink

Home Browse Search

directly on AC power (across the line) at full motor speed and load. Motor noise when operating on VFD shall not exceed full speed measured noise levels when operating at reduced motor load and speed conditions between 40 and 100 percent of output frequency. Noise shall be measured in accordance with IEEE Standard 85. Output noise filters shall be provided where necessary to meet this requirement. 7. Speed regulation ±3 percent without the use of a motor mounted tachometer. F. Features 1. Provisions for the following control signals for automatic and remote manual operations: a. Start/stop signal from a single remote dry contact closure (maintained contact). b. A linear 4-20 mA, 24 VDC input signal for remote speed (output frequency) control proportional to 20 - 100 percent output speed (frequency). This range (20 - 100 percent) shall be field adjusted for proper control coordination. Input signal isolation shall be provided. c. Remote setpoint adjustment from a single 0-10 VDC input signal. Once the setpoint has been provided to the VFD, the VFD shall operate to maintain this setpoint through feedback loop control from a linear 4-20 mA, 24 VDC input signal. This operation shall continue until a new remote setpoint is received even if the remote setpoint signal is lost. 2. Controller keypad to program drive parameters as specified herein. 3. Hand/off/automatic selector switch with auxiliary contacts as required by the Drawings. 4. Potentiometer or equivalent for manual speed (output frequency) control. 5. Drive controller output digital type indicator and transmitter calibrated in percent of maximum output frequency. Transmitter shall provide a linear, isolated, 4-20 mA, 24 VDC output proportional to 0 - 100 percent (initial setting) of maximum output frequency. 6. Incoming line molded -case switch or disconnect, mechanically interlocked with the variable frequency drive cabinet door handle, shall be provided. These shall be 250A, minimum with a minimum withstand rating of 25,000 amperes or as indicated on the drawings. These switches shall be padlockable in the "OFF" position. Incoming line circuit breakers or fuses as required by the VFD manufacturer shall be provided. These shall be current -limiting if specified by the manufacturer. 7. 120V a.c. control circuitry. 8. Provision for automatic emergency shutdown without rampdown, in any mode, actuated by large, red, illuminated, local emergency pushbutton. 9. One set of DPST auxiliary contacts for each remote indication of status as required by the Drawings. 044572017 16483-5