Transcat 24 VDC User manual
24 VDC Loop Power
Supply
Operation Manual
MANUALREV9
INTRODUCTION
The 24VDC Loop Power Supply (24VDCLOOP) is a portable battery powered loop power
supply. It is ideal for sites where power is unavailable. The low noise regulated output
is suitable for use with smart transmitters. Power is automatically turned off when load
is removed, preserving battery life. Outputs feature short circuit protection. Three LEDs
indicate power, fault and low battery status. A protective boot and two AA, Alkaline
batteries are included.
QUICKSTART/OPERATION DIAGRAM
Output Terminals:
24VDC output. Observe correct polarity. Must be connected to load for On Key to function.
Green LED:
On when loop is powered.
Red LED:
On when not able to maintain 24V output. Ashort circuit or low loop impedance will also
cause this LED to illuminate.
Yellow LED:
On when batteries are nearing depletion.
To avoid damage to rechargeable batteries, remove when this LED is illuminated.
ON Key:
Press to turn power on when connected to a loop. Output will not be enabled unless a load
is connected to the output terminals.
Auto-Off & Power Hold Function:
When the loop is connected, press the On key to enable the output voltage.
The 24VDCLOOP does not have an Off switch. When testing is complete, simply
disconnect the loop and the unit will turn off automatically. If the loop is re-connected
within approximately 30 seconds, the unit will power on automatically.
Batteries
The 24VDCLOOP uses 2 (two) AA batteries. Recommended batteries are Lithium (non-
rechargeable), Alkaline, or NiMH (rechargeable). To avoid damage by over-discharging,
rechargeable batteries should be removed when the Yellow Low Battery LED illuminates.
Non-Rechargeable batteries may continue to be used until the Red Fault LED illuminates,
at which time the output voltage will have fallen below 24 V.
Approximate Battery Life (Typical) (Conditions: 12 mA loop current, 23°C)
Battery Chemistry
T
ype Examples Typical Battery
Life
(hours)
Low Battery
indication
(Yellow LED)
Lithium
Non-
Rechargeable Energizer
Ultimate 14.5
(10 hours at -20° C)
2 minutes remaining
at 24 V output
5 minutes until output
drops below 18 V
Alkaline
Non-
Rechargeable
Rayovac
Max Plus 815
6
30 minutes remaining
at 24 V output
40 minutes until output
drops below 18
V
Duracell
MN1500
Energizer
E91, EN91
NiMH Rechargeable Energizer
recharge 9Remove batteries
immediately
NiMH,
Low Self Discharge
Rechargeable Sanyo
Eneloop 7.5 Remove batteries
immediately
CAUTION: Do not use AA sized, 3.6 V Li-Ion batteries in the 24VDCLOOP. Doing so
will damage the device.
Battery Replacement
Remove the protective boot and slide the battery cover off. Replace the batteries, taking
care to note the correct polarity. For best results, always replace batteries in pairs. Do not
mix fresh and old batteries or batteries of different types.
CAUTION: To avoid damage by over-discharging, rechargeable batteries should be
removed immediately when the Yellow Low Battery LED illuminates.
Electrical Specifications / Mechanical Specifications
Output Voltage
_ _ _ _ _ _ _ _ _ _ _ _ _
24 VDC ± 1%
Output Voltage Ripple
_ _ _ _ _ _ _ _
< 14 mV rms Load
Regulation
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
< 1%
Rated Output Current
_ _ _ _ _ _ _ _ _
25 mA
Short Circuit Protection
_ _ _ _ _ _ _
Continuous
Connections
_ _ _ _ _ _ _ _ _ _ _ _ _
4 mm banana jacks
Operating Temperature
_ _ _ _ _ _ _
- 20 to 50°C (- 4 to 122°F)
Storage Temperature
_ _ _ _ _ _ _ _ _
-40 to 75°C (-40 to 167°F)
Operating Humidity
_ _ _ _ _ _ _ _ _ _
95% Relative, non-condensing
Power Supply
_ _ _ _ _ _ _ _ _ _ _ _ _ _
2 x AA batteries, (alkaline 1.5V included)
Overall Dimensions
_ _ _ _ _ _ _ _ _ _
4.8” x 3.1” x 1.2”
Weight
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
200 g (0.44 lbs) including alkaline batteries
Enclosure
Rating
_ _ _ _ _ _ _ _ _ _
IP40
Housing
_ _ _ _ _ _ _ _ _
ABS
Protective Boot
_ _ _ _
Silicone Rubber
Certifications:
Transcat declares that the 24VDCLOOP is in accordance with the Electromagnetic
Compatibility Directive per our declaration.
Warranty
Transcat warrants the 24VDCLOOP to be free from defects in material and workmanship
under normal use and service for 1 year from date of purchase to the original purchaser. It
does not apply to batteries or when the product has been misused, altered or damaged by
accident or abnormal conditions of operation.
For warranty service, call customer service at (800) 828-1470 or (585) 352-9460. Please
have your model number, serial number, date of purchase and reason for return. You will
receive instructions for returning the device to Transcat. Transcat will, at our option, repair
or replace the defective device free of charge and the device will be returned, transporta-
tion prepaid. However, if it is determined that the failure was caused by misuse, alteration,
accident or abnormal condition of operation, you will be billed for the repair.
TRANSCAT MAKES NO WARRANTY OTHER THAN THE LIMITED WARRANTY
STATED ABOVE. ALL WARRANTIES,INCLUDING IMPLIED WARRANTIESOF MER-
CHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE, ARE LIMITED TO A
PERIOD OF 1 YEAR FROM THE DATE OF PURCHASE. TRANSCAT SHALL NOT BE
LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES,WHETH-
ER IN CONTRACT, TORT OR OTHERWISE.
TRAN
S
CA
T
35 Vantage Point Drive, Rochester, NY 14624
Phone: 800-828-1470 or 585-352-9460 Fax: 800-395-0543
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