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Capstone Turbine Corporation ■ 21211 Nordhoff Street ■ Chatsworth ■ CA 91311 Service Bulletin: Solid State Relay Transient Voltage Suppressor Install Instructions Abstract: The SSR output circuits must NOT be connected to any inductive device, regardless of the voltage level, without the installation of a transient voltage suppressor. Description: The SSR outputs in the UCBE or UCBEE are rated at a maximum of 240 VAC (rms) under both steady state and transient conditions. The voltage across the solid-state relays in the UCBE or UCBEE must NEVER EXCEED 350 VOLTS PEAK. Even transient voltages above this value may cause severe damage to the solid state relay circuitry. High peak voltages can occur in any circuit that contains inductive loads similar to relay coils, contactor coils, or motors. These high peak voltages can occur even though the steady-state voltages may be within the 240 VAC limits. In certain instances, Capstone has experienced failure of the SSR outputs, and therefore failure of the UCBE or UCBEE circuit board when the SSR outputs were used to drive even a small 120 VAC relay coil. Failures have occurred at 5 VDC where the SSR output has directly driven a relay. In each of these events, the failure was due to a transient over voltage that occurred when the relay coil was being de-energized. Corrective Action: 1. Suitable transient voltage suppressors MUST BE installed in parallel with the SSR output whenever it is connected to a circuit that contains relay coils, contactor coils, or motors. (Refer to the diagram on page 4). 2. If a transient voltage suppressor (an MOV or semiconductor) is utilized, it must have a maximum clamping voltage of less than 350 volts @ 100 milliamps. (Microsemi Corp. P/N 1.5KE300CA). 512100-002 (July 2001) Page 2 of 4 Service Bulletin SB0015. This information is confidential and proprietary to Capstone. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered.PDF Image | Solid State Relay Transient Voltage Suppressor Installation Instructions
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