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Page Title:
Firing solenoid operating current |
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|  MIL-T-82571A(OS)
CAUTION
When testing solenoid operating currents
(4.4.5.10 and 4.4.5.11), do not leave volt -
age across the solenoids for extended per-
iods of time.
4.4.5.10 Safe-ready solenoid operating current. With 115 plus or minus
0.5 volts ac applied across terminals 6 and 9 of TB104, measure and record
the current flow in Barrel No. 1. With 115 plus or minus 0.5 volts ac ap-
plied across terminals 2 and 5 of TB105, measure and record the current flow
in Barrel No. 2. The total current drawn by the safe-ready solenoids in
each barrel shall not exceed 0.4 ampere continuous (0.52 ampere inrush).
*
4.4.5.11 Firing solenoid operating current. With 115 plus or minus 0.5
volts ac applied across terminals 5 and 6 of TB104, measure and record the
current flow in Barrel No. 1. With 115 plus or minus 0.5 volts ac applied
across terminals 1 and 2 of TB105, measure and record the current flow in
Barrel No. 2. The total current drawn by the solenoid in each barrel shall
I
not exceed 1.95 amperes (inrush) and 1.5 amperes (continuous).
*
4.4.5.12 Total barrel operating current. The total operating current of
each barrel, computed by adding the values recorded in 4.4.5.9, 4.4.5.10,
and 4.4.5.11, shall not exceed 10.5 amperes.
*
4.4.5.13 Muzzle door heater resistance. With the thermoswitch cooled with
C02 to close the heater circuit, measure the muzzle door heater resistance of
Barrel No. 1 by disconnecting the leads to terminals 7 and 8 of TB102-1 in
the control box and measuring the resistance across pins 7 and 8. Measure
the heater resistance of Barrel No. 2 by cooling the- thermoswitches, dis-
connecting the leads to terminals 7 and 8 of TB102-2, and measuring the re-
sistance across pins 7 and 8. The resistance of the heater in each barrel shall be
14.4 plus 1.6 or minus 0.7 ohms.
4.4.5.14 Muzzle door seal test. With a pull scale engaged to the lip of
the door farthest removed from the hinge, apply sufficient force in an axial
direction to open the muzzle doors. The force required to open each door
shall be 20 plus or minus 12 pounds.
4.4.5.15 Squib fire switch. With the control box latch plates in the
locked position, continuity shall exist across terminals 8 and 9 of TB101-1
in the control box of Barrel No. 1 and across terminals 8 and 9 of TB101-2
in the control box of Barrel No. 2. Release the latch on the control box
of each barrel and observe that the switch plunger moves out forcefully; also
verify that continuity exists across terminals 8 and 10 of TB101-1 and ter-
minals 8 and 10 of TB101-2.
4.4.5.16 Ready light interlock circuit. With the interlock switches of
4.4.5.16.1, 4.4.5.16.2, and 4.4.5.16.3 closed, continuity shall exist between
terminals 7 and 8 of TB104 for Barrel No. 1 and between terminals 3 and 4 of
15
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