Table of Contents
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Input Voltage
Nominal Input Voltage
Input Current
Output
ac Component
Voltage
ac tolerance
Regulation
dc Offset
Type of ringing Battery Backed Ground Backed
Ground Backed no-dc
dc Offset Tracking
Error
Harmonic Distortion
Crest Factor
Output Frequency
Frequency tolerance
Output VA
Thermal Limiting
Load Power Factor
Operating Temperature
Heat Dissipation
Under Voltage Shutdown
Operating Input Voltage Range
Input Power
Plant Parameter Setting
Alarm Contact Ratings
Operating Temperature
Page 21
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-40 to -57 V
-48 V
5 A max.
65 to 100 V
Factory Default: 100Vac
± 5 V
±5% ac component only
•
•
•
•
•
•
See figures in the Ringer section.
± 3 V
5% THD
1.21 to 1.51
15 to 50 Hz
Factory Default: 20 Hz
± 1 Hz
100 VA
Output VA may be reduced by reducing Vac when operating
simultaneously above 50°C and less than -50V
Vac is reduced only sufficiently to prevent damage to the
ringer.
Operating: 0.5 Leading to 0.9 Lagging
No Damage: 0 Leading to 0.7 Lagging
-40 to +75 °C
50 W (170 BTU / hr)
50% of Output V
While shutdown due to external fault, restart will be
performed at approximately 2 minute intervals.
Table 2-J: QS820A Ringer Specifications
38 to 60 V
6.0 watts maximum
Through front panel LCD display and menu keys or with IBM
compatible PC with RS-232 port. 841 also has 10/100 Baset-T
network ability
60 V
-40 to +75 °C
Table 2-K: QS840A and QS841A Control Unit Specifications
See Output VA Thermal Limiting.
dc
dc
ac
ac
-40 to +57 Vdc Battery Backed
·+40 to +57 V
Ground Backed
dc
0 V
Offset Disabled
dc
dc Offset tracks dc Input Voltage
Factory Default: Enabled
Battery or Ground Backed is selected by Ringer Chassis
jumper J12 or by external connection of Ring Rtn to Bat-
tery or to Ground. Factory Default: Battery Backed by
Jumper
dc
See Output VA Thermal Limiting.
Set Point
ac
dc
, 0.5A, Form-C
dc
input.
dc
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