SOW_Relay_Driver_Circuit_Card_Assembly_line_item_2_MA016.pdf

STATEMENT OF WORK FOR

RELAY DRIVER CIRCUIT CARD ASSEMBLY (RELAY DRIVER CCA)

Rev. 04/16

1.0 General. The Relay Driver CCA resides inside a Day/Night Range Light Switch Box - DC (RSB-DC) and controls the switching operation between the daytime and nighttime signals in a standard day/night range. The Relay Driver CCA’s circuit uses a very simple switching technique to toggle between daytime and nighttime operation depending solely on ambient light conditions. A Type L photoresistor mounted on the side of the RSB-DC and connected to the Relay Driver CCA continuously monitors nearby light levels. When the ambient light level rises above a preset threshold, the Relay Driver CCA activates a power relay which turns on the daytime light and turns off the nighttime light.

1.1 Deliverables.

1.1.1 The following item shall be provided:

a. Relay Driver CCA as described in the Requirements paragraph (2.0) below.

2.0 Requirements.

2.1 Relay Driver Circuit Card Assembly. Contractor shall fabricate the relay driver circuit card assembly (CCA) according to the Schematic Diagram (Figure 2) using parts listed in the accompanying Parts List For Relay Driver CCA. The CCA shall be conformally-coated front and back with a spray-on urethane coating to protect the components from corrosion. The circuit board shall be 3" long by 2½" wide with a tolerance of +0.0625" along each side. Mounting hole spacing shall be 2½" and 2" respectively, as shown in Figure 1. The CCA shall be mounted to the mounting panel using four ½" long stainless steel standoffs with 6-32 stainless steel hardware.

PARTS LIST FOR RELAY DRIVER CCA

SEMICONDUCTORS:

IC1 -- CD40106BE, CMOS Hex Schmitt Trigger Q1 -- TIP120, NPN Power Darlington Transistor D1 -- 1N5822, 3A Schottky Rectifier Diode, 40V PIV D2 -- 1N4004, 1A Rectifier Diode, 400V PIV

RESISTORS:

R1* -- 27K ohms, ¼-watt, ±1%, Metal Film, ±50ppm/ºC or better R2 -- 1,000 ohms, ¼-watt, ±5%, Standard Carbon Composite R3 -- 1 Megohm, ¼-watt, ±5%, Standard Carbon Composite RV1, RV2 -- ZNR Panasonic Part No. ERZ-C20DK220

* The value of R1 may change

CAPACITORS:

C1 -- 100uf, Sprague Part No. TE1211, or equivalent C2 -- 1.0uf, Sprague Part No. 2C20Z5U105M050B, or equivalent C3 -- 0.1uf, Philips Part No. CW-20C104K, or equivalent C4 -- 0.047uf, Sprague Part No. 1C25Z5U473M050B, or equivalent

FUSE:

F1 -- PolySwitch Resettable Fuse, Raychem Part No. RUE110

HARDWARE:

TB1-TB3 -- Augat/RDI Terminal Block 4PCV-02 Printed Circuit Board -- Fabricate, 3"x 2½"