
26 | SAMLEX AMERICA INC.
5.7.4 2-Wire Remote ON / OFF Control using ENB Terminals and External Transistor Switch
Refer to Fig 5.5
NO
COM.
ENB
GND
ENB
NC
Inverter is ON
when switch is ON
ON/OFF
switch
Fuse
Battery (+) voltage from the same
battery system that is feeding
PSR-1200-24/48 (current draw < 6mA)
NO
COM.
ENB
GND
ENB
NC
NO
COM.
ENB
GND
ENB
NC
Inverter is ON
when switch is ON
ON/OFF
switch
Fuse
External DC voltage source
● 10 to 40 VDC for PSR-1200-24
● 20 to 60 VDC for PSR-1200-48
(current draw < 6mA)
+10 to 40 VDC for PSR-1200-24
+20 to 60 VDC for PSR-1200-48
NO
COM.
ENB
GND
ENB
NC
Inverter is ON
when switch is ON
ON/OFF
switch
NPN Transitor Switch
Vcc return
Vcc
9
Base drive
● Base High (Transistor is ON) → The unit will switch ON
● Base Low (Transistor is OFF) → The unit will switch OFF
Fig 5.5 2-Wire Remote Control ON / OFF using ENB and GND Terminals and External Transistor Switch
5.8 2-WIRE REMOTE MONITORING OF ALARMS / FAULTS
A Single Pole Double Throw (SPDT) relay with Normally Open (NO), Common and Normally Closed (NC)
contacts has been provided to enable 2-wire remote monitoring of the following 6 alarm / fault conditions
through contact switching (See Fig 5.6 below):
1. Fan Fault; 2. Over Voltage (OV) Alarm; 3. Under Voltage (UV) Alarm; 4. Overload Shut Down;
5. Over Temperature Shut Down; 6. Short Circuit Shut Down
The relay contacts may be used to switch external monitoring circuits of up to 277 VAC, 16A.
The relay can be programmed through Parameter "Relay Setup" to energize when any one or
combination of the above 6 Alarm / Fault conditions is "Enabled". The Default setting is "Enabled"
for all 6 conditions which means that the relay will energize due to any one or a combination of the 6
possible abnormal conditions. For programming details, refer to Fig 10.1 / Table 10.1 under Main Menu
for Parameter Group 1 – "UI Setting" / Sub Menu for Parameter Group 1, Parameter (f) – "Relay Setup"
(Section 10.2.1.6).
NO
COM.
ENB
GND
ENB
NC
To external
monitoring circuits
7-Way Terminal Block
(Refer to 12, Fig 6.2)
Fig 5.6 NO, COM & NC Relay contacts for external monitoring circuits
SECTION 5 |
Description & Principles of Operation