Installation Instructions – H Series
** Important Note
Before connecting AC power to the H Series, please verify that the power transformer is
correctly terminated as detailed section 6. Failure to do so could damage the power
supply.
Installation
1) Power Supply Terminals
To meet safety requirements, the power supply terminals must not be used as the
external terminations of any equipment. The wiring of any primary circuitry should
be routed in such a way that it does not touch any secondary (output) components.
2) Service Personnel
This product must only be installed in a restricted access location, accessible to
authorized competent personnel only. Some surfaces of the power supply may be
hot, and must not be touched when the product is in operation.
3) Earthing
For protective earthing, please ensure a secure connection of the Frame Ground
terminal to the ground terminal of the equipment as the protective earth connection.
Screws and washers used must be of a suitable material as defined by the relevant
agency specifications.
4) Cooling
The power supply must be installed where the unit is allowed free air convection.
Forced air-cooling will enhance reliability.
5) Remote sensing
Some models have remote sensing to compensate for load cable drops. The H
Series units come wired for local sense from the factory. Remove the wire jumpers
and install remote sense wiring if load regulation is critical.
Remote sense wiring to the end load should ideally be twisted together and routed
separately from load cables or other noisy wiring.
6) Input connection
The AC power is wired directly to the primary of the main power transformer. One or
two jumpers will also needed on that transformer. Connect the AC Line & Neutral
and jumper(s) as follows:
LAMBDA
HSeries
For use at:
Jumper(s)
Apply L & N to:
AC INPUT & JUMPER INFORMATION
100VAC
120VAC
220VAC
1 - 3, 2 - 4
1 – 3, 2 - 4
2-3
1-5
1–4
1-5
230/240VAC
2-3
1-4
7) AC fuse
An external fuse (see ratings table) should be installed. Use a 125VAC or higher
rated fuse for 100-120VAC operation, and a 250VAC fuse for 220-240VAC
operation. Fuse type should be anti-surge.
8) External Overvoltage Protectors (OVP12 module)
In general most 5V output H Series power supplies come with internal Over Voltage
Protection. If OVP is required on other voltage outputs, then an external OVP
module should be fitted as follows:
The OVP module is user adjustable from approximately 6.2V to 34V.
The maximum current rating of the OVP12 module is 12A peak, 8A continuous.
The recommended trigger voltages are
Nominal Output Voltage
5V
12V
15V
24V
Dual +/-12V
Dual +/-15V
Suggested Trip Point
6.2 +/-0.4V
14V
17V
27V
27V
33V
The above table indicates Lambda’s recommended level set point for different output
voltages. Where +/- outputs exist with a common terminal, a single OVP module
located across the + and – terminals will provide functional OVP for both individual
outputs.
The OVP module comes complete with mounting hardware and hookup leads. To
connect the OVP to your supply, see your power supply’s user’s manual for
recommended placement or Lambda’s website
www.lambda.com
for the power
supply outline drawing. See example below
LAMBDA
HSeries
Solder the black lead to the – lead of the supply and the white lead to the + output of
the supply. Double check to be sure that the + output of the supply is connected to
the + lead of the OVP module and the – output is connected to the – lead. Rotate the
potentiometer (R1) on the OVP module completely clockwise. Without having your
load connected to the supply, apply power to the supply and adjust the output
voltage on the supply, to the level at which you wish the OVP to trigger. Slowly
adjust R1 on the OVP module counterclockwise to the point at which the output of
the supply drops suddenly. The OVP trip level is now set. Remove input power to
the power supply and back the voltage adjust potentiometer slightly. Re-energize the
supply and adjust the output voltage to the nominal voltage rating. The OVP trip
level is now set. You may wish to set the OVP potentiometer in place with an
electrical grade varnish such as glyptol.
Your load is now protected against an overvoltage condition that could destroy the
load.
Should you experience a situation where the OVP triggers, remove input power!
Check for any failures.
If the input fuse to the power supply is blown, it is a good indication that there is a
failure to the power supply itself.
If you find that there is no failure, re-energize the supply. If the supply voltage
returns to nominal, the power supply and OVP will be ready for another OVP
situation. This is called a nuisance trip. It is not uncommon and does not indicate a
failure of the OVP module. Instead, it has done its job and protected your circuit.
Nuisance tripping is generally caused by voltage spikes created by the load. If it
continually occurs, check your load for noise generating conditions and correct them.
LAMBDA
HSeries
Under all conditions, removal of input power is necessary to reset the OVP.
9) CE Marking
The CE Marking on the product is applied to show conformance to the requirements
outlined in the European Union’s Low Voltage Directive [72/73/EEC] are amended
by the CE Marking Directive [93/68/EEC] in that is compliant with EN60950.
LAMBDA
HSeries
H Series Selector Guide
Output Voltage (V)
o
Output Current (A)
60 C
2.1
4.2
6.3
8.4
1.2
2.4
3.6
1.1
2.1
3.2
4.2
0.8
1.7
2.5
3.4
0.7
1.4
2.1
2.8
o
Max Output
Power (W)
o
Model
Case Size
AC Input Fusing
110V
230V
0.25A
0.5A
0.75A
1.0A
0.25A
0.5A
0.75A
0.25A
0.5A
0.75A
1.0A
0.25A
0.5A
0.75A
1.0A
0.25A
0.5A
0.75A
1.0A
50 C
Single Output Models
5
3
5
6
5
9
5
12
12
1.7
12
3.4
12
5.1
15
1.5
15
3
15
4.5
15
6
24
1.2
24
2.4
24
3.6
24
4.8
28
1
28
2
28
3
28
4
Dual Output Models
0.8
1.0/0.8
-0.8
1.0/0.8
0.8
1.8/1.5
-0.8
1.8/1.5
12*
3.4
12*
3.4
15*
3
15*
3
Triple Output Models
5*
3
0.8
1.0/0.8
-0.8
1.0/0.8
5*
6
0.8
1.7/1.5
-0.8
1.7/1.5
OVP Option
N/A
* Isolated outputs
70 C
1.2
2.4
3.6
4.8
0.7
1.4
2
0.6
1.2
1.8
2.4
0.5
1
1.4
1.9
0.4
0.8
1.2
1.6
15
30
45
60
20.4
40.8
61.2
22.5
45
67.5
90
28.8
57.6
86.4
115.2
28
56
84
112
HSB 5-3-OVP
HSC5-6-OVP
HSN5-9-OVP
HSD-5-12-OVP
HSB-12-1.7
HSC-12-3.4
HSN-12-5.1
HSB-15-1.5
HSC-15-3
HSN-15-4.5
HSD-15-6
HSB-24-1.2
HSC-24-2.4
HSN-24-3.6
HSD-24-4.8
HSB-28-1.0
HSC-28-2.0
HSN-28-3.0
HSD-28-4.0
A
B
C
I
A
B
C
A
B
C
I
A
B
C
I
A
B
C
I
0.5A
1.5A
1.5A
2.0A
0.5A
1.5A
1.5A
0.5A
1.5A
1.5A
2.0A
0.5A
1.5A
1.5A
2.0A
0.5A
1.5A
1.5A
2.0A
0.7/0.56
0.7/0.56
1.26/1.05
1.26/1.05
2.4
2.4
2.1
2.1
0.4/0.32
0.4/0.32
0.72/0.6
0.72/0.6
1.4
1.4
1.2
1.2
24
40
80
80
HDA-12-15
HDB-12-15
HDC12
HDC15
H
D
I
I
1.0A
1.0A
2.0A
2.0A
0.5A
0.5A
1.0A
1.0A
2.1
0.7/0.56
0.7/0.56
4.2
1.2/1.05
1.2/1.05
1.2
0.4/0.32
0.4/0.32
2.8
0.68/0.6
0.68/0.6
40
HTC1
F
1.0A
0.5A
70
HTD1
G
2.0A
1.0A
12
OVP12
LAMBDA
HSeries
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