Unipower PCM500 Series, Operating Manual

12

PCM500 SERIES

OPERATING MANUAL

The FA1 through FA5 alarms function for up to five fuse or circuit breaker
distribution panels. If any fuse or circuit breaker on any panel opens, this will
cause the FA (Fuse or Circuit Breaker Alarm) red LED to come on and the
FA Form C relay to change state. The LVDA1 and LVDA2 alarm-enable
switches are for one or two Low Voltage Disconnect panels. If either one of
these experience a disconnect, the LVDA (Low Voltage Disconnect Alarm)
red LED will come on and the LVDA Form C relay will change state.

15.0

VOLTAGE AND CURRENT MEASUREMENTS

15.1

Meters and Test Points. The meter panel option (Option MP) provides a
digital voltmeter and ammeter on the left front panel to monitor the battery
voltage and current.

15.2

Voltage. The digital voltmeter reads battery voltage directly, to tenths of a volt.
The “volts” test points on the right front panel also permit direct external
measurement of the battery voltage when the MP option is not taken.

15.3

Current. The digital ammeter is scaled at the factory to read amperes based
on a 50 millivolt  external shunt and corresponding internal scale factor which
must be chosen at the time of ordering. The following table gives the amme-
ter shunt rating and ordering suffix code for the correct meter setting at the
factory. The external shunt must be connected with correct polarity
across the I+ and I- input terminals (TB1 terminals 41 and 8, respectively).
See Figure 4 and Section 13.2.

ALARM-ENABLE  DIP  SWITCHES

POS.

SW. NO.1

SW. NO.2

SW. NO.3

SW. NO.4

NO.

FUNCTION

FUNCTION

FUNCTION

FUNCTION

1

SR11

SR21

SR31

SR41

2

SR12

SR22

SR32

SR42

3

SR13

SR23

SR33

SR43

4

SR14

SR24

SR34

SR44

5

FA1

FA3

FA5

LVDA1

6

FA2

FA4

NC

LVDA2

External 50mV Shunt

AMMETER

SHUNT  RATING

CODE

250

250A

300

300A

500

500A

1000

1000A

1500

1500A

2000

2000A

25

25A

30

30A

50

50A

75

75A

100

100A

150

150A

200

200A

AMMETER

SHUNT  RATING

CODE