Bender MEDICS USC710D4 HA Series User manual

Power in electrical safety
Operating Manual
MEDICS® USC710D4-..-HA
Control module for circuit breakers
for setting up changeover and monitoring modules
with and without manual/automatic control
TGH1390en/04.2011

©Dipl.-Ing. W. Bender GmbH & Co.KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Dipl.-Ing. W. Bender GmbH & Co.KG
Londorfer Str. 65 • 35305 Grünberg • Germany
Postfach 1161 • 35301 Grünberg • Germany
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Web: http://www.bender-de.com

3
Table of Contents
TGH1390en/04.2011
1. How to use this operating manual effectively ................................................... 5
1.1 How to use this manual ......................................................................................................... 5
1.2 Explanations of symbols and notes ................................................................................... 5
2. Safety instructions .................................................................................................. 7
2.1 Intended use .............................................................................................................................. 7
2.2 Skilled persons .......................................................................................................................... 7
2.3 Device-specific safety information .................................................................................... 7
2.4 General safety instructions ................................................................................................... 8
2.5 Delivery conditions, guarantee, warranty and liability .............................................. 8
3. System description ................................................................................................. 9
3.1 MEDICS® ...................................................................................................................................... 9
3.2 Features USC710D4-.. .......................................................................................................... 10
3.3 Function USC710D4-.. .........................................................................................................11
3.3.1 The changeover and monitoring module .................................................................... 11
3.3.2 Version for generator operation ...................................................................................... 12
3.3.3 Monitoring the device functions ..................................................................................... 13
3.3.4 Monitoring of the neutral conductor ............................................................................ 13
3.3.5 Power supply .......................................................................................................................... 13
3.3.6 Behaviour in the event of a fault ..................................................................................... 13
3.4 System components ............................................................................................................16
3.5 Schematic diagrams ............................................................................................................. 16
3.6 Schematic Diagram USC710D4-01-HA ......................................................................... 17
3.7 Schematic Diagram USC710D4-02-HA .......................................................................... 18
3.8 Schematic diagram USC710D4-03-HA .......................................................................... 19
3.9 Schematic diagram USC710D4-04-HA .......................................................................... 20
3.10 Schematic diagram USC710D4-05-HA .......................................................................... 21
3.11 Schematic diagram USC710D4-06-HA .......................................................................... 22
3.12 Schematic diagram USC710D4-07-HA .......................................................................... 23
3.13 Schematic diagram USC710D4-08-HA .......................................................................... 24
4. Installation and connection ............................................................................... 25
4.1 Fuses .......................................................................................................................................... 25

Table of Contents
4TGH1390en/04.2011
4.1.1 Selecting a fuse with only one load per line conductor .......................................... 25
4.1.2 Selecting a fuse with several loads at one line conductor ..................................... 26
4.2 Connection .............................................................................................................................. 27
4.2.1 Typical connection ............................................................................................................... 27
4.2.2 Wiring diagrams and circuit diagrams .......................................................................... 27
4.2.3 Alarm indicator and test combination .......................................................................... 27
4.2.4 TMX-HA ..................................................................................................................................... 28
4.2.5 SCADA system (Supervisory Control And Data Acquisition) ................................. 28
5. Commissioning, settings and testing ............................................................... 29
5.1 Setting and testing according to the checklist ........................................................... 29
5.1.1 Avoiding errors ...................................................................................................................... 29
5.2 Assigning addresses-examples ........................................................................................ 30
5.2.1 A control module with two alarm indicator and test combinations .................. 30
5.2.2 Two control modules with two alarm indicator and test combinations each 30
6. Trouble shooting .................................................................................................. 31
6.1 PRC487 error messages ....................................................................................................... 31
6.2 Complete failure of the control module ....................................................................... 32
7. Periodic verification and service ....................................................................... 33
7.1 Periodic verification .............................................................................................................. 33
7.1.1 Testing the changeover module ..................................................................................... 34
7.2 Service ....................................................................................................................................... 34
7.3 Maintenance ........................................................................................................................... 34
8. Data ......................................................................................................................... 35
8.1 TÜV test report ....................................................................................................................... 35
8.2 Standards ................................................................................................................................. 36
8.3 Manufacturer's certificate .................................................................................................. 36
8.4 Technical data ........................................................................................................................ 36
8.5 Ordering information .......................................................................................................... 38
9. Manufacturer's certificate, checklist, circuit documentation ....................... 41

How to use this operating manual effectively
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TGH1390en/04.2011
1. How to use this operating manual effectively
1.1 How to use this manual
This operating manual describes how to operate the USC710D4-.. control module. It is designed for
electrically skilled persons working in electrical engineering and electronics; and in particular for
those designing, installing and operating electrical equipment in the medical sector.
Before using the equipment, please read this operating manual, the supplement entitled “Important
safety instructions for Bender Products" and the instruction leaflets supplied with the individual sys-
tem components. This document must be kept in an easily accessible location near to the equip-
ment.
Should you have any further questions, please contact our Technical Sales Department. We are also
happy to provide on-site service. Please contact our Service Department for more information.
In this manual, the two redundant supplies for the power supply will be designated "preferred sup-
ply" or "line 1" and "second supply" or "line 2". Devices with displays use the terms "line 1" and "line 2"
in the text they indicate. The term "line 3" is used for the output of the changeover module.
This manual has been compiled with great care. Nevertheless, errors and omissions cannot be entire-
ly excluded. The Bender Group cannot accept any liability for injury to persons or damage to prop-
erty resulting from errors or mistakes in this operating manual.
1.2 Explanations of symbols and notes
The following terms and symbols are used to denote hazards and instructions in Bender documen-
tation:
This symbol indicates an immediate risk to life and limb.
Failure to observe the associated instructions and take appropriate precautions
will result in death, severe bodily injury or substantial damage to property.
This symbol indicates a potential risk to life and limb.
Failure to observe the associated instructions and take appropriate precautions
may result in death, severe bodily injury or substantial damage to property.
This symbol indicates a potentially dangerous situation.
Failure to observe the associated instructions and take appropriate precautions
may result in minor bodily injury or damage to property.
Danger!
Warning
Caution

How to use this operating manual effectively
6TGH1390en/04.2011
This symbol indicates important information about the correct use of the equip-
ment purchased.
Failure to observe the associated instructions can result in equipment malfunc-
tioning or cause problems in the environment in which it is being used.
This symbol indicates tips for using the equipment and particularly useful infor-
mation. This type of information will help you to optimise your use of the equip-
ment.

Safety instructions
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TGH1390en/04.2011
2. Safety instructions
2.1 Intended use
The USC710D4-.. control module is applied for circuit breakers for setting up changeover and moni-
toring modules with or without manual/automatic control. It is designed to be used in medical loca-
tions, group 1 and 2 in accordance with DIN VDE 0100-710 (VDE 0100 Part 710), section 710.537.6.
It is used in medical locations and monitors the power supply using two independent three-phase
supply sources with neutral conductor. The USC710D4-.. control module detects whether the pre-
ferred supply has failed and automatically performs a four-pole changeover to the second supply.
The loads have to be connected between the line conductor and the neutral conductor. It is not per-
mitted to connect loads between the line conductors.
Customised parameter settings must be made on the equipment for the purpose of adapting it to
local equipment and operating conditions, in order to meet the requirements of applicable stand-
ards.
The equipment can also be used in non-medical areas provided that
the intended application has been cleared with Bender in advance.
Please note the limits of the area of application indicated in the technical data. Use
deviating from or beyond the scope of this is considered non-compliant.
Intended use also implies:
zDevice-specific settings in accordance with DIN VDE 0100-710 (VDE 0100 Part 710) section
710.537.6 changeover periods).
zThe observation of all information in the operating manual.
zCompliance with test intervals.
2.2 Skilled persons
Only electrically skilled persons may work on Bender products. Skilled means, persons
who are familiar with the assembly, commissioning and operation of the equipment and have un-
dergone appropriate training. Such persons must have read this manual and understood all instruc-
tions relating to safety.
2.3 Device-specific safety information
Device-specific settings are required in order to adapt the MEDICS® module to
the existing equipment. To this end, refer to the instructions in chapter "5. Com-
missioning, settings and testing", page 29ff.
Warning

Safety instructions
8TGH1390en/04.2011
2.4 General safety instructions
Bender equipment is designed and built in accordance with the state of the art and accepted rules
in respect of technical safety. However, the use of such devices may introduce risks to the life and
limb of the user or third parties and/or result in damage to Bender equipment or other property.
zOnly use Bender equipment:
–asintended
– in perfect working order
– in compliance with the accident prevention regulations and guidelines applicable in the
location of use
zRectify any faults that may impair safety immediately.
zDo not make any unauthorised changes and only use replacement parts and optional accesso-
ries purchased from or recommended by the manufacturer of the equipment. Failure to
observe this requirement can result in fire, electric shock and injury.
zReference plates must always be clearly legible. Replace damaged or illegible plates immedi-
ately.
zMake sure that the dimensioning of the UPS (special safety power supply source), the generator
system and the whole wiring is adequate. Observe the applicable national and international
standards within this context. Only in this way selective operation of safety devices can be
achieved and a high degree of safety in case of overload and short circuit can be ensured.
2.5 Delivery conditions, guarantee, warranty and liability
The conditions of sale and delivery set out by Bender shall apply.
Conditions of sale and delivery can be obtained from Bender in printed or electronic format.

System description
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TGH1390en/04.2011
3. System description
3.1 MEDICS®
The USC710D4-.. control module is a part of the MEDICS® system.
Example of a section of a hospital with MEDICS® system
Key for example
MK… Alarm indicator and test combination
RCMS… Residual current monitoring system for TN-S systems
SMI472 Signal converter for third-party systems (e. g. med. gases, UPS)
TM Alarm indicator and operator panel
UFC107E… Changeover and monitoring module for IT systems with EDS… insulation fault loca-
tion system
UMC107E… Changeover and monitoring module for IT systems
UMC710D… Changeover module for main distribution boards
USC710D… Control module for changeover modules (preferably in main distribution boards)

System description
10 TGH1390en/04.2011
MEDICS®includes:
zAC and 3(N)AC changeover and monitoring modules. Examples of modules in the MEDICS® sys-
tem include UMC…, USC…, UFC… and EDS… insulation fault location systems.
zDisplay and operating units such as alarm indicator and operator panels or alarm indicator and
test combinations.
zCommunication between these components takes place via the BMS bus (two-wire connec-
tion).
zThe connection of third-party systems by means of protocol converters (gateways), via digital
inputs and relay outputs.
The real strength of MEDICS®is to be found in communication between all involved components and
the resulting information provided to the user. Readiness for operation is monitored continuously.
Operating states, irregularities, faults and equipment failures are displayed. From the user's point of
view, this means high operational reliability.
3.2 Features USC710D4-..
The USC710D4-.. control module has the following features:
zCircuit-breakers and switch disconnectors of different manufacturers can be connected.
zSuitable for setting up three or four pole changeover modules including switch disconnectors
or circuit-breakers
zVoltage monitoring on the preferred supply (line 1)
zVoltage monitoring on the second supply (line 2)
zVoltage monitoring at the output of the changeover module (line 3 )
zMonitoring of the switching elements to ensure that they are in the correct switching state and
for open-circuits (connecting wires, the circuits of the drive motors of the switch disconnectors)
zPossibility to evaluate the message "Tripped" initiated by circuit breakers.
zInternal functional testing including checking of the changeover times
zCommunication with remote alarm indicator and test combinations and TM… alarm indicator
and operator panels as well as with other components of the SCADA system via BMS bus
zPossibility to set the time delay for the changeover in 50 ms increments for adaptation to the
total off-time according to DIN VDE 0100-710 (VDE 0100 Part 710) section 710.537.6.2.k) resp. to
the return transfer time according to DIN VDE 0100-710 (VDE 0100 Part 710) section
710.537.6.1.f)
zCan be used in systems in accordance with DIN VDE 0100-710 (VDE 0100 Part 710) section
710.564.6 with a changeover period of ≤15 s or ≤0.5 s, depending on the circuit-breaker or
switch disconnector.
zPossibility to monitor the N conductor (optional)
zGenerator operation with a generator test input and a generator start-up output (option, see
chapter “8.5 Ordering information”)
– In normal operation, the message "Failure line 2" is suppressed.
– Start-up command for the generator in case of failure of line 1.
– Input for generator test. The generator starts up after closing the switch. Changeover to line
2 takes place as soon as the voltage is stabilised.

System description
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TGH1390en/04.2011
3.3 Function USC710D4-..
3.3.1 The changeover and monitoring module
If the preferred supply should fail, the USC710D4-.. ensures safe changeover of the power supply:
1. In normal condition (fault-free condition), the preferred supply (line 1) is connected via the
switch disconnector Q1. This makes it impossible for the system connected downstream to fail
on account of torn lines or a failure of the control voltage.
2. If the voltage at the end of the preferred supply falls below the set value or exceeds a value of
115 % x Un, the module automatically changes over to the second supply (line 2): Once the set
response time t(off) has elapsed, Q1 is disconnected and, following the set idle time t(K1-2), Q2
is connected.
3. On voltage recovery, switching back to the preferred supply occurs automatically after the set
return transfer time t(on) has elapsed: Q2 is disconnected and, following the set idle time t(K1-
2), Q1 is connected.
For changeover and monitoring modules with Ieof up to 250 A, the idle time is to be set to ≥300 ms
(for modules >250 A to≥400 ms). Therefore, the factory-set total changeover time for modules 200
A is > 0.5 resp. >1 s resp. and meets the requirements for a changeover period of < 15 s. In this way,
overvoltages due to fast switching operations can be avoided. The response time t(off) and idle time
t(K1-2) must be adjusted according to the requirements of the specific application case.
If the control device detects a supply line failure or a fault, a message appears in the LC display, the
"ALARM" LED lights up, the alarm relay switches, and this alarm is transmitted to other Bender devic-
es (such as alarm indicator and test combinations) via the BMS bus.
The MEDICS® module is a configured unit and is only certified and tested in this
assembly. Do not make any changes to the components, their password-pro-
tected settings or the wiring without consulting Bender first.
In each case you should make the settings that are required for adaptation to the
application case in question and local conditions.
The response time t(off), the idle time t(K1-2) and the return transfer time t(on) of
the MEDICS® module can be set and must be adjusted according to the require-
ments of the specific application case, the short-circuit calculation and the re-
quirements of IEC 60364-7-710, sections 556.5.2.2, 556.7 and 556.8 and DIN VDE
0100-710 (VDE 0100 Part 710), section 710.537.6 (automatic changeover mod-
ules) (see chapter 5. "Commissioning, settings and testing“).
Warning
Warning

System description
12 TGH1390en/04.2011
The USC710D4-..-HA control module provides the following possibilities:
1. It is designed to be operated with the TMX-HA alarm indicator and operator panel. That addi-
tionally allows manual operation of the changeover and monitoring module which is required,
for example, for revision procedures. When operated in manual mode, an alarm message
occurs on the control module or via BMS bus on associated remote alarm indicators and test
combinations MK… or TM… operator panels. Note: The alarm indicator and operator panel
TMX-HA is not included in the scope of delivery.
2. Alternatively, messages about internal operating statuses can be assigned to specific relays.
That requires the setting of specific parameters on the PRC487. When a TMX-HA alarm indica-
tor and operator panel is used and additional alarm contacts are required, a URC-11 resp. URC-
14 relay module is to be used for the purpose of contact expansion.
3. Optional switching back interlocking function (see chapter “4.2.1 Typical connection”).
3.3.2 Version for generator operation
The USC710D4-03 and USC710D4-04 control modules are designed for generator operation, i.e. line
2 is to be supplied by a generator. In normal condition, line 2 is deenergised. Therefore, the message
"Failure line 2“ remains deactivated as long as the generator is switched off.
Behaviour in the event of failure of line 1
If line 1 fails, the USC710D4-03-HA and USC710D4-04-HA control modules initiate a start-up signal
for the generator. For this purpose, an output in N/C operation is available at the terminals X4:3, X4:4
and X4:5. In normal condition, the contacts X4:3 X4:4 are open, if line 1 fails, the contacts will close.
Generator test
For running a generator test under load, the USC710D4-03-HA and USC710D4-04-HA control mod-
ules provide a control input for initiating a generator start-up and a changeover process whilst the
generator is supplying line 2.
By applying a control voltage of AC/DC 12…240 V to the terminals X4:1 (+) and X4:2 (-), a failure of a
line conductor of line 1 is simulated and the alarm message "Failure line 1“ is generated. The start-up
of the generator is initiated.
Change-over to line 2 will take place as soon as line 2 is energised. This will only be the case if the
generator has booted up correctly and line 2 is being supplied.
Precondition for reliable function in the event of generator operation:
tNG > t(off) N19 > t(on) N3
-The disconnecting delay time the generator tNG needs (from voltage recovery
on line 1 until the generator is shuts off) must be greater than the response time
t(off) set at the voltage relay N19 (factory setting 20 s).
-The response time t(off) at the voltage relay N19 must be greater than the return
transfer time t(on) of the changeover module (PRC487 – N3 factory setting 15 s).
Caution

System description
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3.3.3 Monitoring the device functions
The control circuits are constructed in such a way that even if a particular fault will almost certainly
occur, it cannot cause the power supply at the output of the automatic changeover and monitoring
module to fail. Examples: Failure of the control voltage, operation of a pro-tective device, a short-cir-
cuit to exposed-conductive part or an earth fault, and an open-circuits.
In addition to this, the control module continuously monitors:
zThe control circuit required for the next changeover process (coil, control contacts, connec-
tions).
zFor alarm indicator and test combinations, and alarm indicator and operator panels, device fail-
ure monitoring can also be programmed via the BMS bus.
Thanks to the redundant hardware design of the control module, it is guaranteed to function safely
even if the microcontroller should fail.
3.3.4 Monitoring of the neutral conductor
The neutral conductor is also monitored. In normal operation, generally small currents (at least 10
mA) are assumed to flow continuously through the neutral conductor. The connection of an addi-
tional load avoids the likelihood of completely symmetrical load currents. If the current falls below
10 mA in the neutral conductor, an interruption is to be expected. In this case, changeover takes
place and the corresponding messages are triggered.
The neutral conductor monitoring can be deactivated (see instruction leaflet PRC487).
Versions designed for generator operation do not provide neutral conductor monitoring.
3.3.5 Power supply
SUD487 provides the power supply for the PRC487 control device and the control voltage for the
contactors resp. switch disconnectors from line 2, (or from line 1 if line 2 fails). It also provides the
power supply for the AN450 power supply unit.
The AN450 power supply unit supplies power to a maximum of 3 MK2418 or 2 MK2430 alarm indica-
tor and test combinations. It also provides the power supply for the optional alarm indicator and op-
erator panel manual/automatic TMX-HA.
3.3.6 Behaviour in the event of a fault
A) In the event of a short-circuit upstream or downstream of the changeover module:
1. Short-circuit on the preferred supply, upstream of the switching device of the changeover
module:
Voltage failure on line 1 is being recognised;
Changeover to line 2;
Switching back is only possible after voltage recovery + return transfer time.
2. Short-circuit on the preferred supply, upstream of the switching device of the changeover
module:
Voltage failure on line 2 is being recognised;
changeover to line 2 does not take place, even when line 1 fails.

System description
14 TGH1390en/04.2011
3. Short-circuit downstream of the switching devices of the changeover module, upstream the
next fuse:
Voltage failure on line 1 is being recognised;
–Best case:
Fuse in line 1 trips within the delay period of the changeover module; changeover to line 2
fuse in line 2 trips.
Result: unambiguous condition.
–Worst case (delay time not set in accordance with DIN VDE 0100-710):
Fuse in line 1 does not trip within the delay period of the changeover module;
Changeover to line 2.
Voltage recovery on line 1 is being recognised when switching off,
i.e. a short-circuit exists.
Line 2 remains switched on for at least 5 s.
Fuse in line 2 trips during this time.
After this, changeover to line 1 takes place.
Fuse in line 1 reacts.
Result: unambiguous condition.
The delay avoids toggling and ensures reliable tripping of fuses.
4. Short-circuit downstream of the switching devices of the changeover module, downstream of
the next fuse:
–Best case (selectivity criteria considered, delay time of the changeover module set cor-
rectly):
Fuse located in the distribution board downstream of the changeover module trips within
the delay time set for the changeover module;
changeover module does not react.
Result: unambiguous condition.
–Worst case (delay time not set in accordance with DIN VDE 0100-710):
Fuse in the distribution board downstream of the changeover module does not trip within
the delay time set for the changeover module;
Changeover to line 2.
Voltage recovery on line 1 is being recognised when switching off,
i.e. a short-circuit exists.
Line 2 remains switched on for at least 5 s.
Fuse in the distribution board downstream of the changeover module reacts during this
time.
After this, voltage is available again on line 2.
The changeover module changes over to line 1once the set return transfer time has elapsed.
Result: unambiguous condition.
The delay avoids toggling and ensures reliable tripping of fuses.
B) In the event of voltage failure downstream of the changeover module:
Possible cause:
zA defective switching device
zOpen-circuit in line 3 (outgoing circuit of the changeover module)
zOpen-circuit in the signal wiring to SUD487
zA defect in the evaluation circuit
zA defective fuse in the signal wiring to SUD487 (if any)

System description
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1. Normal condition: Line 1 is connected; Voltage on line 1 and line 2 available.
Voltage failure on line 3 is being recognised; Changeover to line 2;
– Voltage on line 3 available:
Result: unambiguous condition.
Message "Failure Q1(K1)"
Line 2 remains connected until the fault is cleared and a reset is carried out at the PRC487.
– Voltage failure on line 3 continues to exist:
Changeover to line 1;
then two attempts are made to connect Q 1 resp. Q 2.
No-voltage condition on line 3 continues to exist, the changeover module remains on line 2;
Result: unambiguous condition.
Message: "Failure Q1", "Failure Q2", "Failure line 3".
2. Malfunction 1: Line 1 is connected; no voltage on line 2; message "Failure line 2“
– Voltage failure on line 3 is being recognised:
permanent attempts to connect Q1 (if Q2 has been switched off manually – line 1 is the pre-
ferred supply, make sure that this line is connected).
Result: unambiguous condition.
Message: "Failure Q1(K1)" , "Failure line 1" , "Failure line 3".
Line 1 remains connected until the fault is cleared and a reset is carried out at the PRC487.
– On voltage recovery on line 2, the changeover module changes over to line 2 once the
return transfer has elapsed and remains connected.
Result: unambiguous condition.
Message: "Failure Q1", Failure line 3", until the fault is cleared and a reset is carried out at the
PRC487.
3. Malfunction 2: Line 2 is connected; no voltage on line 1; voltage available on line 2
– Voltage failure on line 3 is being recognised;
3 attempts to connect Q2 (if Q2 was switched off manually).
Result: unambiguous condition.
Message: "Failure Q1(K1)" , "Failure line 1" , "Failure line 3".
Line 2 remains connected until the fault is cleared and a reset is carried out at the PRC487.
– On voltage recovery on line 1, the changeover module changes over to line 1 once the
return transfer has elapsed and remains connected.
Result: unambiguous condition.
Message: "Failure Q2", "Failure line 3", until the fault is cleared and a reset is carried out at
the PRC487.

System description
16 TGH1390en/04.2011
3.4 System components
In chapter “9. Manufacturer's certificate, checklist, circuit documentation” of this operating manual
you will find instruction leaflets containing detailed information about the following system compo-
nents:
3.5 Schematic diagrams
The following pages show the schematic diagrams for typical USC710D4-.. control modules. Other
versions may deviate from these in terms of their mechanical design.
PRC487 Control device for changeover modules
SUE487, SUD487 Voltage relay
BMS bus Bender Measuring Device Interface
AN450 Power supply unit
RK464, RK474 Relay module
CV460 Open-circuit monitoring
TMX-HA Alarm indicator and operator panel manual/
automatic
W1-S35, W2-S70 Measuring current transformers W0-S20…W5-
S210
UMS461 Voltage relay
SP480 Energy backup DC 12 V
W35, W60 Measuring current transformers W…

System description
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3.6 Schematic Diagram USC710D4-01-HA
Legend to schematic diagram:
1 X1 Terminal strip X1
2 R1, R2 Resistors for open-circuit monitoring
3 K11, K12,
K13, K14
Auxiliary relay
4 X3 Terminal strip X3
5 N2 Voltage monitoring device SUD487
6 N16 Voltage monitor UMS461
7 N3 Control device PRC487
8 T1 Power supply unit AN450 for the supply of up to three alarm indicator and
test combinations MK2418 or two MK2430
9 N5 Open-circuit monitoring CV460
10 N6 Relay module RK474
1
6
4
5
2
10
9
8
7
3

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3.7 Schematic Diagram USC710D4-02-HA
Legend to schematic diagram:
1 X1 Terminal strip X1
2 R1, R2 Resistors for open-circuit monitoring
3 X3 Terminal strip X3
4 N2 Voltage monitoring device SUD487
5 N3 Control device PRC487
6 T1 Power supply unit AN450 for the supply of up to three alarm indicator and
test combinations MK2418 or two MK2430
7N6RelaymoduleRK474
1
7
6
5
4
3
2

System description
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3.8 Schematic diagram USC710D4-03-HA
Legend to schematic diagram:
1 X1 Terminal strip X1
2 R1, R2 Resistors for open-circuit monitoring
3 K11, K12,
K13, K14
Auxiliary relay
4 X3, X4 Terminal board X3 and X4
5 N2 Voltage monitoring device SUD487
6 N16 Voltage monitor UMS461
7 N19, N20 Voltage monitor VMD420 for generator operation
8 N3 Control device PRC487
9 T1 Power supply unit AN450 for the supply of up to three alarm indicator and
test combinations MK2418 or two MK2430
10 N5 Open-circuit monitoring CV460
11 N5 Relay module RK474
12 K15 Relay for generator test
13 N18 Energy backup SP480 for PRC487
1
8
3
2
5
4
67
13
910 11 12

System description
20 TGH1390en/04.2011
3.9 Schematic diagram USC710D4-04-HA
Legend to schematic diagram:
1 X1 Terminal strip X1
2 R1, R2 Resistors for open-circuit monitoring
3 K4 Auxiliary relay
4 X3, X4 Terminal board X3 and X4
5 N2 Voltage monitoring device SUD487
6 N19 Voltage monitor VMD420 for generator operation
7 N18 Energy backup SP480 for PRC487
8 N3 Control device PRC487
9 T1 Power supply unit AN450 for the supply of up to three alarm indicator and
test combinations MK2418 or two MK2430
10 N5 Relay module RK474
11 K15 Relay for generator test
124
9
811
10
7
3
56