A DS2020DACAG2 is used when the primary power source for a control system is 125 V dc with or without a battery. In addition to power conversion, DACA provides additional local energy storage to extend the ride-through time whenever the Mark VIe Control has a complete loss of control power.
The DS2020DACAG2 model has a higher power rating than the previous module. Also, this new model can be paralleled for greater output current, whereas paralleling was not recommended for the previous model. The DS2020DACAG2 is recommended for all new panel designs.
DS2020DACAG2 Installation：
The DACA module has four mounting holes in its base.AC power input and DC output are through a single 12-position connector JZ that is wired into connector JZ2 or JZ3 of the PDM. Selection of 115 V ac or 230 V ac input is made by plugging the DACA internal cable into connector JTX1 for 115 V or JTX2 for 230 V.
DS2020DACAG2 Filter Capacitor Wear Out：
The electrolytic capacitors in the DACA module wear out over time due to the ambient temperature of the environment where they are used. The following table shows the calculated life expectancy and recommended replacement schedule for the DACA modules.
| Calculated Life Expectancy of DACA Capacitor |
Recommended Replacement Schedule* |
| At 20°C (68 °F) ambient |
100 years |
| At 45°C (113 °F) ambient |
20 years |
| At 65°C (149 °F) ambient |
5 years |
To replace a DS2020DACAG2 power conversion module：
1 Remove power from the DACA module. Allow 1 minute for the output voltage to discharge.
2 Remove the power input/output cable (JZ) on the right side of the module top.
3 Remove the four bolts securing the DACA module to the floor of the cabinet.
4 Remove the DACA module.
5 Make note of which receptacle the capacitor power plug is in. This is on the left side of the module's top. JTX1 is for 115 V ac, and JTX2 is for 230 V ac.
6 Ensure the capacitor power plug is in the same position as the one removed. JTX1 is for 115 V ac, and JTX2 is for 230 V ac.
7 Place the new DACA module in the same position as the one removed.
8 Secure the DACA module to the cabinet floor with the four bolts removed from the previous module.
9 Install the power input/output plug (JZ) on the right side of the module top.
10 Restore power to the DACA module.
DS2020DACAG2 Operation：
DACA receives AC power through the cable harness that is plugged into connector JZ. DACA uses a full-wave bridge rectifier and an output filter capacitor. If needed, the user must provide an input filter to attenuate harmonic currents injected into the incoming line.
The DACAG2 can be paralleled for greater output current. In parallel operation, current sharing between the two DACAs is critical. Uneven current sharing can cause one of the DACAs to operate beyond its output current rating.
For proper implementation of parallel DACAs, the following must be observed:
• The DACAs must be connected to the same AC source to ensure equal input voltages to the DACAs.
• The maximum output current per DACA is derated for parallel operation. This derating accounts for the variance in DACA open circuit voltages and the variance in DACA output impedances. The following curve should be used. The maximum recommended total panel current is 16.5 A DC.
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