Magnum-energy MS Series User Manual download pdf (Page 56)

Operation

3.4 Transfer Time

While in Standby mode, the AC input is continually monitored. Whenever AC power falls below the

VAC dropout voltage (80 VAC, default setting), the inverter automatically transfers back to Inverter

mode with minimum interruption to your appliances – as long as the inverter is turned on. The

transfer from Standby mode to Inverter mode occurs in approximately 16 milliseconds. While the

MS Series is not designed as a computer UPS system, this transfer time is usually fast enough to

hold them up. However, the VAC dropout setting has an effect on the ability of the loads to transfer

without resetting. The lower this setting, the longer the effective transfer will be and therefore, the

higher the probability for the output loads to reset. This occurs because the incoming AC voltage

is allowed to fall to a level that is so low that when the transfer does occur, the voltage on the

inverter’s output has already fallen low enough to reset the loads.

The disadvantage of a higher VAC dropout setting is that smaller generators (or large generators

with an unstable output) may nuisance transfer. This commonly happens when powering loads that

are larger than the generator can handle – causing the generator’s output voltage to constantly

fall below the inverter’s input VAC dropout threshold.

Info: When switching from Inverter mode to Standby mode, the inverter waits

approximately 15 seconds to ensure the AC source is stable before transferring.

3.5 Battery Temperature Sensor Operation

The plug-in Battery Temperature Sensor (BTS) is used to determine the battery’s temperature.

This information allows the multi-stage battery charger to automatically adjust the battery charge

voltages for optimum charging performance and longer battery life.

With a BTS installed, if the temperature around the BTS is below 77°F (25°C) the absorb and ﬂ oat

charge voltage increases, and if the temperature around the BTS is higher than 77°F (25°C), the

absorb and ﬂ oat charge voltage decreases. See Figure 3-4 to determine how much the charge

voltage changes (increases or decreases) depending on the temperature reading of the BTS. For

example, the nominal absorb charge voltage for a ﬂ ooded battery at 77°F (25°C) on a 24-volt

model is 29.2 VDC. If the battery temperature is 95°F (35°C), the absorb charge voltage would

decrease to 28.6 VDC (29.2 VDC - 0.6 change).

If the temperature sensor is NOT installed, the charge voltages will not be automatically adjusted

because of temperature, but will be maintained at a temperature of 77°F (25°C). The life of the

batteries may be reduced if they are subjected to large temperature changes when the BTS is

not installed.

Info: When the BTS is connected, the battery charger uses a value of -5mV/°C/Cell

from 0-50°C to change the charge voltage based on temperature.

Figure 3-4, BTS Temperature to Charge Voltage Change

-0.75

-0.6

-0.45

-0.3

-0.15

0.15

0.3

0.45

0.6

0.75

0 5 10 15 20 25 30 35 40 45 50

Temperature reading from BTS

Temperature Compensation using BTS

32F

41F

10C

50F

45C

113F

30C

86F

40C

104F

35C

95F

25C

77F

20C

68F

15C

59F

50C

122F

Change to battery charging voltage

no BTS

connected

12VDC units

+0.75V

+0.6V

+0.45V

+0.3V

+0.15V

No Change

-0.15V

-0.3V

-0.45V

-0.6V

-0.75V

24VDC units

+1.5V

+1.2V

+0.9V

+0.6V

+0.3V

No Change

-0.3V

-0.6V

-0.9V

-1.2V

-1.5V

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 75 76

Comments to this Manuals

No comments

Magnum-energy MS Series User Manual Page 56

Comments to this Manuals

Related products and manuals for Relay Magnum-energy MS Series