INSTALLATION
(continued)
FINE ADJUSTMENT
of the DC current is made to the
NUMBERED
taps found on the upper
three terminal blocks (TB4, TB5, TB6). Fine taps are numbered 1-2-3-4, with “1” providing the
lowest
output, increasing to “4,” yielding the
highest
output. A “fine” tap adjustment raises or
lowers the current approximately four amperes. The three fine tap terminal blocks are interconnected
by means of a three-lead jumper wire assembly attached to like-numbered terminals.
• To
increase
the DC output, move the jumper wire assembly to tap the next (3)
higher
numbered
terminals, for example, move from terminals “2” to terminals “3.” ALL TAPS MUST BE ON THE
SAME NUMBERED POSITION (1-1-1, 2-2-2, 3-3-3, or 4-4-4). If the DC output is still too low
when terminals “4” are interconnected, see the following instructions for adjusting
“coarse”
taps.
• To
decrease
the DC output, move the jumper wire assembly to tap the next (3)
lower
numbered
terminals, for example, move from terminals “3” to terminals “2.” ALL TAPS MUST BE ON THE
SAME NUMBERED POSITION (1-1-1, 2-2-2, 3-3-3, or 4-4-4). If the DC output is still too high
when terminals “1” are interconnected, see the following instructions for adjusting
“coarse”
taps.
COARSE ADJUSTMENT
of the DC current is made to the
LETTERED
taps found on the lower
three terminal blocks (TB1, TB2, TB3). Coarse taps are lettered W-X-Y-Z, with “W” providing the
lowest
output, increasing to “Z” at the
highest
output. The coarse tap terminals connect to contactor
terminals T1, T2, and T3. The (3) contactor leads must connect to the same lettered step (W-W-W,
etc.). A “coarse” tap adjustment raises or lowers the current approximately twelve amperes.
• To
increase
the coarse DC output, move each of the contactor leads to tap the next
higher
lettered
terminals, for example, move from terminals “W” to terminals “X.” ALL TAPS MUST BE ON
THE SAME LETTERED POSITION (W-W-W, X-X-X, Y-Y-Y, or Z-Z-Z). Place the fine tap
jumper on 1-1-1. Ignite the lamp, check the output, and increase the fine tap setting as required.
• To
decrease
the coarse DC output, move each of the contactor leads to tap the next
lower
lettered
terminals, for example, move from terminals “Y” to terminals “X.” ALL TAPS MUST BE ON
THE SAME LETTERED POSITION (W-W-W, X-X-X, Y-Y-Y, or Z-Z-Z). Place the fine tap
jumper on 1-1-1. Ignite the lamp, check the output, and increase the fine tap setting as required.
NOTE: Balance power supply output; i.e. set power supplies at or near the same output settings:
Power Supply “A”
X-X-X, 4-4-4 (or as required)
Power Supply “B”
Y-Y-Y, 1-1-1 (or as required)
INSPECT TAP CONNECTIONS to verify that the terminal is clamping the copper
conductor, not the insulation. Make certain all terminal clamping screws are tight.
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