Hussmann Scroll Plus Fibertronic 401789, Installation And Service Manual

Page: 63 / 121

POWER MONITOR
The single phase monitor detects phase loss,
phase reversal, low voltage, and phase imbalance.
It opens the control circuit when any of these con-
ditions occurs. When the fault is corrected, it will
automatically reset. The normally open contacts
will close when 3 Phase voltage is applied to the
three input terminals. The monitor has an indi-
cator that lights as long as it is
not tripped.
The low voltage cutout is adjustable from 180 to
230 volts for 208/230 volt units, and from 380 to
460 volts for 440 volt units. This should be adjust-
ed to 15% below the nominal line voltage at
power source. A voltmeter should be used to
establish actual supply voltage.
The monitor controls a two pole bypass relay
(BP) making and breaking power to the control
panel.
September 1, 1997 P/N 401789
4 - 29
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
L1
L2
L3
NC
NO
C
380
400
420
440
460
OUTPUT
ON
CONTACTS
7 A, 240VAC
SUPPLY:
440-480V,
3Ø
NC
NO
C
UNDER
VOLTAGE
PVCL —400—AR
0 1
2 4 6 8
Single Phase Monitor
Figure 4-27 Power Monitor and Slave Contactor
X
X1
X1A
X2
L1
L2
L3
X2
PR
Contacts
NO
C 2
4
6
8
PVCL
B
BL
BL
O
R
BL
W
Figure 4-28 Electrical Hookup
PR
Figure 4-24 — Power Monitor and Slave Contactor
Figure 4-25 — Electrical Hook-Up
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